d8223ffa75
That year should bring the long-awaited OpenGL ES 3.0 compatible renderer
with state-of-the-art rendering techniques tuned to work as low as middle
end handheld devices - without compromising with the possibilities given
for higher end desktop games of course. Great times ahead for the Godot
community and the gamers that will play our games!
(cherry picked from commit c7bc44d5ad)
474 lines
18 KiB
C++
474 lines
18 KiB
C++
/*************************************************************************/
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/* slider_joint_sw.cpp */
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/*************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* http://www.godotengine.org */
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/*************************************************************************/
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/* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur. */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/*************************************************************************/
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/*
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Adapted to Godot from the Bullet library.
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See corresponding header file for licensing info.
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*/
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#include "slider_joint_sw.h"
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//-----------------------------------------------------------------------------
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static _FORCE_INLINE_ real_t atan2fast(real_t y, real_t x)
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{
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real_t coeff_1 = Math_PI / 4.0f;
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real_t coeff_2 = 3.0f * coeff_1;
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real_t abs_y = Math::abs(y);
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real_t angle;
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if (x >= 0.0f) {
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real_t r = (x - abs_y) / (x + abs_y);
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angle = coeff_1 - coeff_1 * r;
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} else {
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real_t r = (x + abs_y) / (abs_y - x);
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angle = coeff_2 - coeff_1 * r;
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}
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return (y < 0.0f) ? -angle : angle;
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}
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void SliderJointSW::initParams()
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{
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m_lowerLinLimit = real_t(1.0);
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m_upperLinLimit = real_t(-1.0);
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m_lowerAngLimit = real_t(0.);
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m_upperAngLimit = real_t(0.);
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m_softnessDirLin = SLIDER_CONSTRAINT_DEF_SOFTNESS;
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m_restitutionDirLin = SLIDER_CONSTRAINT_DEF_RESTITUTION;
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m_dampingDirLin = real_t(0.);
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m_softnessDirAng = SLIDER_CONSTRAINT_DEF_SOFTNESS;
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m_restitutionDirAng = SLIDER_CONSTRAINT_DEF_RESTITUTION;
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m_dampingDirAng = real_t(0.);
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m_softnessOrthoLin = SLIDER_CONSTRAINT_DEF_SOFTNESS;
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m_restitutionOrthoLin = SLIDER_CONSTRAINT_DEF_RESTITUTION;
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m_dampingOrthoLin = SLIDER_CONSTRAINT_DEF_DAMPING;
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m_softnessOrthoAng = SLIDER_CONSTRAINT_DEF_SOFTNESS;
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m_restitutionOrthoAng = SLIDER_CONSTRAINT_DEF_RESTITUTION;
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m_dampingOrthoAng = SLIDER_CONSTRAINT_DEF_DAMPING;
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m_softnessLimLin = SLIDER_CONSTRAINT_DEF_SOFTNESS;
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m_restitutionLimLin = SLIDER_CONSTRAINT_DEF_RESTITUTION;
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m_dampingLimLin = SLIDER_CONSTRAINT_DEF_DAMPING;
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m_softnessLimAng = SLIDER_CONSTRAINT_DEF_SOFTNESS;
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m_restitutionLimAng = SLIDER_CONSTRAINT_DEF_RESTITUTION;
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m_dampingLimAng = SLIDER_CONSTRAINT_DEF_DAMPING;
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m_poweredLinMotor = false;
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m_targetLinMotorVelocity = real_t(0.);
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m_maxLinMotorForce = real_t(0.);
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m_accumulatedLinMotorImpulse = real_t(0.0);
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m_poweredAngMotor = false;
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m_targetAngMotorVelocity = real_t(0.);
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m_maxAngMotorForce = real_t(0.);
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m_accumulatedAngMotorImpulse = real_t(0.0);
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} // SliderJointSW::initParams()
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//-----------------------------------------------------------------------------
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//-----------------------------------------------------------------------------
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SliderJointSW::SliderJointSW(BodySW* rbA, BodySW* rbB, const Transform& frameInA, const Transform& frameInB)
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: JointSW(_arr,2)
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, m_frameInA(frameInA)
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, m_frameInB(frameInB)
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{
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A=rbA;
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B=rbB;
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A->add_constraint(this,0);
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B->add_constraint(this,1);
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initParams();
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} // SliderJointSW::SliderJointSW()
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//-----------------------------------------------------------------------------
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bool SliderJointSW::setup(float p_step)
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{
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//calculate transforms
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m_calculatedTransformA = A->get_transform() * m_frameInA;
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m_calculatedTransformB = B->get_transform() * m_frameInB;
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m_realPivotAInW = m_calculatedTransformA.origin;
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m_realPivotBInW = m_calculatedTransformB.origin;
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m_sliderAxis = m_calculatedTransformA.basis.get_axis(0); // along X
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m_delta = m_realPivotBInW - m_realPivotAInW;
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m_projPivotInW = m_realPivotAInW + m_sliderAxis.dot(m_delta) * m_sliderAxis;
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m_relPosA = m_projPivotInW - A->get_transform().origin;
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m_relPosB = m_realPivotBInW - B->get_transform().origin;
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Vector3 normalWorld;
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int i;
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//linear part
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for(i = 0; i < 3; i++)
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{
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normalWorld = m_calculatedTransformA.basis.get_axis(i);
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memnew_placement(&m_jacLin[i], JacobianEntrySW(
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A->get_transform().basis.transposed(),
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B->get_transform().basis.transposed(),
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m_relPosA,
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m_relPosB,
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normalWorld,
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A->get_inv_inertia(),
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A->get_inv_mass(),
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B->get_inv_inertia(),
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B->get_inv_mass()
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));
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m_jacLinDiagABInv[i] = real_t(1.) / m_jacLin[i].getDiagonal();
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m_depth[i] = m_delta.dot(normalWorld);
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}
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testLinLimits();
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// angular part
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for(i = 0; i < 3; i++)
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{
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normalWorld = m_calculatedTransformA.basis.get_axis(i);
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memnew_placement(&m_jacAng[i], JacobianEntrySW(
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normalWorld,
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A->get_transform().basis.transposed(),
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B->get_transform().basis.transposed(),
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A->get_inv_inertia(),
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B->get_inv_inertia()
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));
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}
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testAngLimits();
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Vector3 axisA = m_calculatedTransformA.basis.get_axis(0);
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m_kAngle = real_t(1.0 )/ (A->compute_angular_impulse_denominator(axisA) + B->compute_angular_impulse_denominator(axisA));
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// clear accumulator for motors
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m_accumulatedLinMotorImpulse = real_t(0.0);
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m_accumulatedAngMotorImpulse = real_t(0.0);
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return true;
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} // SliderJointSW::buildJacobianInt()
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//-----------------------------------------------------------------------------
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void SliderJointSW::solve(real_t p_step) {
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int i;
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// linear
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Vector3 velA = A->get_velocity_in_local_point(m_relPosA);
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Vector3 velB = B->get_velocity_in_local_point(m_relPosB);
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Vector3 vel = velA - velB;
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for(i = 0; i < 3; i++)
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{
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const Vector3& normal = m_jacLin[i].m_linearJointAxis;
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real_t rel_vel = normal.dot(vel);
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// calculate positional error
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real_t depth = m_depth[i];
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// get parameters
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real_t softness = (i) ? m_softnessOrthoLin : (m_solveLinLim ? m_softnessLimLin : m_softnessDirLin);
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real_t restitution = (i) ? m_restitutionOrthoLin : (m_solveLinLim ? m_restitutionLimLin : m_restitutionDirLin);
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real_t damping = (i) ? m_dampingOrthoLin : (m_solveLinLim ? m_dampingLimLin : m_dampingDirLin);
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// calcutate and apply impulse
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real_t normalImpulse = softness * (restitution * depth / p_step - damping * rel_vel) * m_jacLinDiagABInv[i];
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Vector3 impulse_vector = normal * normalImpulse;
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A->apply_impulse( m_relPosA, impulse_vector);
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B->apply_impulse(m_relPosB,-impulse_vector);
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if(m_poweredLinMotor && (!i))
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{ // apply linear motor
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if(m_accumulatedLinMotorImpulse < m_maxLinMotorForce)
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{
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real_t desiredMotorVel = m_targetLinMotorVelocity;
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real_t motor_relvel = desiredMotorVel + rel_vel;
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normalImpulse = -motor_relvel * m_jacLinDiagABInv[i];
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// clamp accumulated impulse
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real_t new_acc = m_accumulatedLinMotorImpulse + Math::abs(normalImpulse);
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if(new_acc > m_maxLinMotorForce)
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{
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new_acc = m_maxLinMotorForce;
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}
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real_t del = new_acc - m_accumulatedLinMotorImpulse;
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if(normalImpulse < real_t(0.0))
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{
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normalImpulse = -del;
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}
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else
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{
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normalImpulse = del;
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}
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m_accumulatedLinMotorImpulse = new_acc;
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// apply clamped impulse
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impulse_vector = normal * normalImpulse;
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A->apply_impulse( m_relPosA, impulse_vector);
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B->apply_impulse( m_relPosB,-impulse_vector);
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}
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}
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}
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// angular
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// get axes in world space
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Vector3 axisA = m_calculatedTransformA.basis.get_axis(0);
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Vector3 axisB = m_calculatedTransformB.basis.get_axis(0);
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const Vector3& angVelA = A->get_angular_velocity();
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const Vector3& angVelB = B->get_angular_velocity();
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Vector3 angVelAroundAxisA = axisA * axisA.dot(angVelA);
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Vector3 angVelAroundAxisB = axisB * axisB.dot(angVelB);
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Vector3 angAorthog = angVelA - angVelAroundAxisA;
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Vector3 angBorthog = angVelB - angVelAroundAxisB;
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Vector3 velrelOrthog = angAorthog-angBorthog;
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//solve orthogonal angular velocity correction
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real_t len = velrelOrthog.length();
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if (len > real_t(0.00001))
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{
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Vector3 normal = velrelOrthog.normalized();
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real_t denom = A->compute_angular_impulse_denominator(normal) + B->compute_angular_impulse_denominator(normal);
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velrelOrthog *= (real_t(1.)/denom) * m_dampingOrthoAng * m_softnessOrthoAng;
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}
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//solve angular positional correction
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Vector3 angularError = axisA.cross(axisB) *(real_t(1.)/p_step);
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real_t len2 = angularError.length();
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if (len2>real_t(0.00001))
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{
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Vector3 normal2 = angularError.normalized();
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real_t denom2 = A->compute_angular_impulse_denominator(normal2) + B->compute_angular_impulse_denominator(normal2);
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angularError *= (real_t(1.)/denom2) * m_restitutionOrthoAng * m_softnessOrthoAng;
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}
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// apply impulse
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A->apply_torque_impulse(-velrelOrthog+angularError);
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B->apply_torque_impulse(velrelOrthog-angularError);
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real_t impulseMag;
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//solve angular limits
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if(m_solveAngLim)
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{
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impulseMag = (angVelB - angVelA).dot(axisA) * m_dampingLimAng + m_angDepth * m_restitutionLimAng / p_step;
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impulseMag *= m_kAngle * m_softnessLimAng;
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}
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else
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{
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impulseMag = (angVelB - angVelA).dot(axisA) * m_dampingDirAng + m_angDepth * m_restitutionDirAng / p_step;
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impulseMag *= m_kAngle * m_softnessDirAng;
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}
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Vector3 impulse = axisA * impulseMag;
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A->apply_torque_impulse(impulse);
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B->apply_torque_impulse(-impulse);
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//apply angular motor
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if(m_poweredAngMotor)
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{
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if(m_accumulatedAngMotorImpulse < m_maxAngMotorForce)
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{
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Vector3 velrel = angVelAroundAxisA - angVelAroundAxisB;
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real_t projRelVel = velrel.dot(axisA);
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real_t desiredMotorVel = m_targetAngMotorVelocity;
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real_t motor_relvel = desiredMotorVel - projRelVel;
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real_t angImpulse = m_kAngle * motor_relvel;
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// clamp accumulated impulse
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real_t new_acc = m_accumulatedAngMotorImpulse + Math::abs(angImpulse);
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if(new_acc > m_maxAngMotorForce)
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{
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new_acc = m_maxAngMotorForce;
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}
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real_t del = new_acc - m_accumulatedAngMotorImpulse;
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if(angImpulse < real_t(0.0))
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{
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angImpulse = -del;
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}
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else
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{
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angImpulse = del;
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}
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m_accumulatedAngMotorImpulse = new_acc;
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// apply clamped impulse
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Vector3 motorImp = angImpulse * axisA;
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A->apply_torque_impulse(motorImp);
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B->apply_torque_impulse(-motorImp);
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}
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}
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} // SliderJointSW::solveConstraint()
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//-----------------------------------------------------------------------------
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//-----------------------------------------------------------------------------
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void SliderJointSW::calculateTransforms(void){
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m_calculatedTransformA = A->get_transform() * m_frameInA ;
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m_calculatedTransformB = B->get_transform() * m_frameInB;
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m_realPivotAInW = m_calculatedTransformA.origin;
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m_realPivotBInW = m_calculatedTransformB.origin;
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m_sliderAxis = m_calculatedTransformA.basis.get_axis(0); // along X
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m_delta = m_realPivotBInW - m_realPivotAInW;
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m_projPivotInW = m_realPivotAInW + m_sliderAxis.dot(m_delta) * m_sliderAxis;
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Vector3 normalWorld;
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int i;
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//linear part
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for(i = 0; i < 3; i++)
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{
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normalWorld = m_calculatedTransformA.basis.get_axis(i);
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m_depth[i] = m_delta.dot(normalWorld);
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}
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} // SliderJointSW::calculateTransforms()
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//-----------------------------------------------------------------------------
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void SliderJointSW::testLinLimits(void)
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{
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m_solveLinLim = false;
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m_linPos = m_depth[0];
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if(m_lowerLinLimit <= m_upperLinLimit)
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{
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if(m_depth[0] > m_upperLinLimit)
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{
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m_depth[0] -= m_upperLinLimit;
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m_solveLinLim = true;
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}
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else if(m_depth[0] < m_lowerLinLimit)
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{
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m_depth[0] -= m_lowerLinLimit;
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m_solveLinLim = true;
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}
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else
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{
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m_depth[0] = real_t(0.);
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}
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}
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else
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{
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m_depth[0] = real_t(0.);
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}
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} // SliderJointSW::testLinLimits()
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//-----------------------------------------------------------------------------
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void SliderJointSW::testAngLimits(void)
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{
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m_angDepth = real_t(0.);
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m_solveAngLim = false;
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if(m_lowerAngLimit <= m_upperAngLimit)
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{
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const Vector3 axisA0 = m_calculatedTransformA.basis.get_axis(1);
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const Vector3 axisA1 = m_calculatedTransformA.basis.get_axis(2);
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const Vector3 axisB0 = m_calculatedTransformB.basis.get_axis(1);
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real_t rot = atan2fast(axisB0.dot(axisA1), axisB0.dot(axisA0));
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if(rot < m_lowerAngLimit)
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{
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m_angDepth = rot - m_lowerAngLimit;
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m_solveAngLim = true;
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}
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else if(rot > m_upperAngLimit)
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{
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m_angDepth = rot - m_upperAngLimit;
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m_solveAngLim = true;
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}
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}
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} // SliderJointSW::testAngLimits()
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//-----------------------------------------------------------------------------
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Vector3 SliderJointSW::getAncorInA(void)
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{
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Vector3 ancorInA;
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ancorInA = m_realPivotAInW + (m_lowerLinLimit + m_upperLinLimit) * real_t(0.5) * m_sliderAxis;
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ancorInA = A->get_transform().inverse().xform( ancorInA );
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return ancorInA;
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} // SliderJointSW::getAncorInA()
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//-----------------------------------------------------------------------------
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Vector3 SliderJointSW::getAncorInB(void)
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{
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Vector3 ancorInB;
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ancorInB = m_frameInB.origin;
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return ancorInB;
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} // SliderJointSW::getAncorInB();
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void SliderJointSW::set_param(PhysicsServer::SliderJointParam p_param, float p_value) {
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switch(p_param) {
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case PhysicsServer::SLIDER_JOINT_LINEAR_LIMIT_UPPER: m_upperLinLimit=p_value; break;
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case PhysicsServer::SLIDER_JOINT_LINEAR_LIMIT_LOWER: m_lowerLinLimit=p_value; break;
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case PhysicsServer::SLIDER_JOINT_LINEAR_LIMIT_SOFTNESS: m_softnessLimLin=p_value; break;
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case PhysicsServer::SLIDER_JOINT_LINEAR_LIMIT_RESTITUTION: m_restitutionLimLin=p_value; break;
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case PhysicsServer::SLIDER_JOINT_LINEAR_LIMIT_DAMPING: m_dampingLimLin=p_value; break;
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case PhysicsServer::SLIDER_JOINT_LINEAR_MOTION_SOFTNESS: m_softnessDirLin=p_value; break;
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case PhysicsServer::SLIDER_JOINT_LINEAR_MOTION_RESTITUTION: m_restitutionDirLin=p_value; break;
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case PhysicsServer::SLIDER_JOINT_LINEAR_MOTION_DAMPING: m_dampingDirLin=p_value; break;
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case PhysicsServer::SLIDER_JOINT_LINEAR_ORTHOGONAL_SOFTNESS: m_softnessOrthoLin=p_value; break;
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case PhysicsServer::SLIDER_JOINT_LINEAR_ORTHOGONAL_RESTITUTION: m_restitutionOrthoLin=p_value; break;
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case PhysicsServer::SLIDER_JOINT_LINEAR_ORTHOGONAL_DAMPING: m_dampingOrthoLin=p_value; break;
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case PhysicsServer::SLIDER_JOINT_ANGULAR_LIMIT_UPPER: m_upperAngLimit=p_value; break;
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case PhysicsServer::SLIDER_JOINT_ANGULAR_LIMIT_LOWER: m_lowerAngLimit=p_value; break;
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case PhysicsServer::SLIDER_JOINT_ANGULAR_LIMIT_SOFTNESS: m_softnessLimAng=p_value; break;
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case PhysicsServer::SLIDER_JOINT_ANGULAR_LIMIT_RESTITUTION: m_restitutionLimAng=p_value; break;
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case PhysicsServer::SLIDER_JOINT_ANGULAR_LIMIT_DAMPING: m_dampingLimAng=p_value; break;
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case PhysicsServer::SLIDER_JOINT_ANGULAR_MOTION_SOFTNESS: m_softnessDirAng=p_value; break;
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case PhysicsServer::SLIDER_JOINT_ANGULAR_MOTION_RESTITUTION: m_restitutionDirAng=p_value; break;
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case PhysicsServer::SLIDER_JOINT_ANGULAR_MOTION_DAMPING: m_dampingDirAng=p_value; break;
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case PhysicsServer::SLIDER_JOINT_ANGULAR_ORTHOGONAL_SOFTNESS: m_softnessOrthoAng=p_value; break;
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case PhysicsServer::SLIDER_JOINT_ANGULAR_ORTHOGONAL_RESTITUTION: m_restitutionOrthoAng=p_value; break;
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case PhysicsServer::SLIDER_JOINT_ANGULAR_ORTHOGONAL_DAMPING: m_dampingOrthoAng=p_value; break;
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}
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}
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float SliderJointSW::get_param(PhysicsServer::SliderJointParam p_param) const {
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switch(p_param) {
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case PhysicsServer::SLIDER_JOINT_LINEAR_LIMIT_UPPER: return m_upperLinLimit;
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case PhysicsServer::SLIDER_JOINT_LINEAR_LIMIT_LOWER: return m_lowerLinLimit;
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case PhysicsServer::SLIDER_JOINT_LINEAR_LIMIT_SOFTNESS: return m_softnessLimLin;
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case PhysicsServer::SLIDER_JOINT_LINEAR_LIMIT_RESTITUTION: return m_restitutionLimLin;
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case PhysicsServer::SLIDER_JOINT_LINEAR_LIMIT_DAMPING: return m_dampingLimLin;
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case PhysicsServer::SLIDER_JOINT_LINEAR_MOTION_SOFTNESS: return m_softnessDirLin;
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case PhysicsServer::SLIDER_JOINT_LINEAR_MOTION_RESTITUTION: return m_restitutionDirLin;
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case PhysicsServer::SLIDER_JOINT_LINEAR_MOTION_DAMPING: return m_dampingDirLin;
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case PhysicsServer::SLIDER_JOINT_LINEAR_ORTHOGONAL_SOFTNESS: return m_softnessOrthoLin;
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case PhysicsServer::SLIDER_JOINT_LINEAR_ORTHOGONAL_RESTITUTION: return m_restitutionOrthoLin;
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case PhysicsServer::SLIDER_JOINT_LINEAR_ORTHOGONAL_DAMPING: return m_dampingOrthoLin;
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case PhysicsServer::SLIDER_JOINT_ANGULAR_LIMIT_UPPER: return m_upperAngLimit;
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case PhysicsServer::SLIDER_JOINT_ANGULAR_LIMIT_LOWER: return m_lowerAngLimit;
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case PhysicsServer::SLIDER_JOINT_ANGULAR_LIMIT_SOFTNESS: return m_softnessLimAng;
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case PhysicsServer::SLIDER_JOINT_ANGULAR_LIMIT_RESTITUTION: return m_restitutionLimAng;
|
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case PhysicsServer::SLIDER_JOINT_ANGULAR_LIMIT_DAMPING: return m_dampingLimAng;
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case PhysicsServer::SLIDER_JOINT_ANGULAR_MOTION_SOFTNESS: return m_softnessDirAng;
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case PhysicsServer::SLIDER_JOINT_ANGULAR_MOTION_RESTITUTION: return m_restitutionDirAng;
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case PhysicsServer::SLIDER_JOINT_ANGULAR_MOTION_DAMPING: return m_dampingDirAng;
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case PhysicsServer::SLIDER_JOINT_ANGULAR_ORTHOGONAL_SOFTNESS: return m_softnessOrthoAng;
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case PhysicsServer::SLIDER_JOINT_ANGULAR_ORTHOGONAL_RESTITUTION: return m_restitutionOrthoAng;
|
|
case PhysicsServer::SLIDER_JOINT_ANGULAR_ORTHOGONAL_DAMPING: return m_dampingOrthoAng;
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}
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return 0;
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}
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