godot/modules/fbx/data/pivot_transform.cpp

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/*  pivot_transform.cpp                                                  */
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#include "pivot_transform.h"

#include "tools/import_utils.h"

void PivotTransform::ReadTransformChain() {
	const FBXDocParser::PropertyTable *props = fbx_model->Props();
	const FBXDocParser::Model::RotOrder &rot = fbx_model->RotationOrder();
	const FBXDocParser::TransformInheritance &inheritType = fbx_model->InheritType();
	inherit_type = inheritType; // copy the inherit type we need it in the second step.
	print_verbose("Model: " + String(fbx_model->Name().c_str()) + " Has inherit type: " + itos(fbx_model->InheritType()));
	bool ok = false;
	raw_pre_rotation = ImportUtils::safe_import_vector3(FBXDocParser::PropertyGet<Vector3>(props, "PreRotation", ok));
	if (ok) {
		pre_rotation = ImportUtils::EulerToQuaternion(rot, ImportUtils::deg2rad(raw_pre_rotation));
		print_verbose("valid pre_rotation: " + raw_pre_rotation + " euler conversion: " + (pre_rotation.get_euler() * (180 / Math_PI)));
	}
	raw_post_rotation = ImportUtils::safe_import_vector3(FBXDocParser::PropertyGet<Vector3>(props, "PostRotation", ok));
	if (ok) {
		post_rotation = ImportUtils::EulerToQuaternion(FBXDocParser::Model::RotOrder_EulerXYZ, ImportUtils::deg2rad(raw_post_rotation));
		print_verbose("valid post_rotation: " + raw_post_rotation + " euler conversion: " + (pre_rotation.get_euler() * (180 / Math_PI)));
	}
	const Vector3 &RotationPivot = ImportUtils::safe_import_vector3(FBXDocParser::PropertyGet<Vector3>(props, "RotationPivot", ok));
	if (ok) {
		rotation_pivot = ImportUtils::FixAxisConversions(RotationPivot);
	}
	const Vector3 &RotationOffset = ImportUtils::safe_import_vector3(FBXDocParser::PropertyGet<Vector3>(props, "RotationOffset", ok));
	if (ok) {
		rotation_offset = ImportUtils::FixAxisConversions(RotationOffset);
	}
	const Vector3 &ScalingOffset = ImportUtils::safe_import_vector3(FBXDocParser::PropertyGet<Vector3>(props, "ScalingOffset", ok));
	if (ok) {
		scaling_offset = ImportUtils::FixAxisConversions(ScalingOffset);
	}
	const Vector3 &ScalingPivot = ImportUtils::safe_import_vector3(FBXDocParser::PropertyGet<Vector3>(props, "ScalingPivot", ok));
	if (ok) {
		scaling_pivot = ImportUtils::FixAxisConversions(ScalingPivot);
	}
	const Vector3 &Translation = ImportUtils::safe_import_vector3(FBXDocParser::PropertyGet<Vector3>(props, "Lcl Translation", ok));
	if (ok) {
		translation = ImportUtils::FixAxisConversions(Translation);
	}
	raw_rotation = ImportUtils::safe_import_vector3(FBXDocParser::PropertyGet<Vector3>(props, "Lcl Rotation", ok));
	if (ok) {
		rotation = ImportUtils::EulerToQuaternion(rot, ImportUtils::deg2rad(raw_rotation));
	}
	const Vector3 &Scaling = ImportUtils::safe_import_vector3(FBXDocParser::PropertyGet<Vector3>(props, "Lcl Scaling", ok));
	if (ok) {
		scaling = Scaling;
	}
	const Vector3 &GeometricScaling = ImportUtils::safe_import_vector3(FBXDocParser::PropertyGet<Vector3>(props, "GeometricScaling", ok));
	if (ok) {
		geometric_scaling = GeometricScaling;
	}
	const Vector3 &GeometricRotation = ImportUtils::safe_import_vector3(FBXDocParser::PropertyGet<Vector3>(props, "GeometricRotation", ok));
	if (ok) {
		geometric_rotation = ImportUtils::EulerToQuaternion(rot, ImportUtils::deg2rad(GeometricRotation));
	}
	const Vector3 &GeometricTranslation = ImportUtils::safe_import_vector3(FBXDocParser::PropertyGet<Vector3>(props, "GeometricTranslation", ok));
	if (ok) {
		geometric_translation = ImportUtils::FixAxisConversions(GeometricTranslation);
	}
}

Transform PivotTransform::ComputeLocalTransform(Vector3 p_translation, Quat p_rotation, Vector3 p_scaling) const {
	Transform T, Roff, Rp, Soff, Sp, S;

	// Here I assume this is the operation which needs done.
	// Its WorldTransform * V

	// Origin pivots
	T.set_origin(p_translation);
	Roff.set_origin(rotation_offset);
	Rp.set_origin(rotation_pivot);
	Soff.set_origin(scaling_offset);
	Sp.set_origin(scaling_pivot);

	// Scaling node
	S.scale(p_scaling);
	// Rotation pivots
	Transform Rpre = Transform(pre_rotation);
	Transform R = Transform(p_rotation);
	Transform Rpost = Transform(post_rotation);

	return T * Roff * Rp * Rpre * R * Rpost.affine_inverse() * Rp.affine_inverse() * Soff * Sp * S * Sp.affine_inverse();
}

Transform PivotTransform::ComputeGlobalTransform(Vector3 p_translation, Quat p_rotation, Vector3 p_scaling) const {
	Transform T, Roff, Rp, Soff, Sp, S;

	// Here I assume this is the operation which needs done.
	// Its WorldTransform * V

	// Origin pivots
	T.set_origin(p_translation);
	Roff.set_origin(rotation_offset);
	Rp.set_origin(rotation_pivot);
	Soff.set_origin(scaling_offset);
	Sp.set_origin(scaling_pivot);

	// Scaling node
	S.scale(p_scaling);

	// Rotation pivots
	Transform Rpre = Transform(pre_rotation);
	Transform R = Transform(p_rotation);
	Transform Rpost = Transform(post_rotation);

	Transform parent_global_xform;
	Transform parent_local_scaling_m;

	if (parent_transform.is_valid()) {
		parent_global_xform = parent_transform->GlobalTransform;
		parent_local_scaling_m = parent_transform->Local_Scaling_Matrix;
	}

	Transform local_rotation_m, parent_global_rotation_m;
	Quat parent_global_rotation = parent_global_xform.basis.get_rotation_quat();
	parent_global_rotation_m.basis.set_quat(parent_global_rotation);
	local_rotation_m = Rpre * R * Rpost;

	//Basis parent_global_rotation = Basis(parent_global_xform.get_basis().get_rotation_quat().normalized());

	Transform local_shear_scaling, parent_shear_scaling, parent_shear_rotation, parent_shear_translation;
	Vector3 parent_translation = parent_global_xform.get_origin();
	parent_shear_translation.origin = parent_translation;
	parent_shear_rotation = parent_shear_translation.affine_inverse() * parent_global_xform;
	parent_shear_scaling = parent_global_rotation_m.affine_inverse() * parent_shear_rotation;
	local_shear_scaling = S;

	// Inherit type handler - we don't care about T here, just reordering RSrs etc.
	Transform global_rotation_scale;
	if (inherit_type == FBXDocParser::Transform_RrSs) {
		global_rotation_scale = parent_global_rotation_m * local_rotation_m * parent_shear_scaling * local_shear_scaling;
	} else if (inherit_type == FBXDocParser::Transform_RSrs) {
		global_rotation_scale = parent_global_rotation_m * parent_shear_scaling * local_rotation_m * local_shear_scaling;
	} else if (inherit_type == FBXDocParser::Transform_Rrs) {
		Transform parent_global_shear_m_noLocal = parent_shear_scaling * parent_local_scaling_m.affine_inverse();
		global_rotation_scale = parent_global_rotation_m * local_rotation_m * parent_global_shear_m_noLocal * local_shear_scaling;
	}
	Transform local_transform = T * Roff * Rp * Rpre * R * Rpost.affine_inverse() * Rp.affine_inverse() * Soff * Sp * S * Sp.affine_inverse();
	//Transform local_translation_pivoted = Transform(Basis(), LocalTransform.origin);

	// manual hack to force SSC not to be compensated for - until we can handle it properly with tests
	return parent_global_xform * local_transform;
}

void PivotTransform::ComputePivotTransform() {
	Transform T, Roff, Rp, Soff, Sp, S;

	// Here I assume this is the operation which needs done.
	// Its WorldTransform * V

	// Origin pivots
	T.set_origin(translation);
	Roff.set_origin(rotation_offset);
	Rp.set_origin(rotation_pivot);
	Soff.set_origin(scaling_offset);
	Sp.set_origin(scaling_pivot);

	// Scaling node
	if (!scaling.is_equal_approx(Vector3())) {
		S.scale(scaling);
	} else {
		S.scale(Vector3(1, 1, 1));
	}
	Local_Scaling_Matrix = S; // copy for when node / child is looking for the value of this.

	// Rotation pivots
	Transform Rpre = Transform(pre_rotation);
	Transform R = Transform(rotation);
	Transform Rpost = Transform(post_rotation);

	Transform parent_global_xform;
	Transform parent_local_scaling_m;

	if (parent_transform.is_valid()) {
		parent_global_xform = parent_transform->GlobalTransform;
		parent_local_scaling_m = parent_transform->Local_Scaling_Matrix;
	}

	Transform local_rotation_m, parent_global_rotation_m;
	Quat parent_global_rotation = parent_global_xform.basis.get_rotation_quat();
	parent_global_rotation_m.basis.set_quat(parent_global_rotation);
	local_rotation_m = Rpre * R * Rpost;

	//Basis parent_global_rotation = Basis(parent_global_xform.get_basis().get_rotation_quat().normalized());

	Transform local_shear_scaling, parent_shear_scaling, parent_shear_rotation, parent_shear_translation;
	Vector3 parent_translation = parent_global_xform.get_origin();
	parent_shear_translation.origin = parent_translation;
	parent_shear_rotation = parent_shear_translation.affine_inverse() * parent_global_xform;
	parent_shear_scaling = parent_global_rotation_m.affine_inverse() * parent_shear_rotation;
	local_shear_scaling = S;

	// Inherit type handler - we don't care about T here, just reordering RSrs etc.
	Transform global_rotation_scale;
	if (inherit_type == FBXDocParser::Transform_RrSs) {
		global_rotation_scale = parent_global_rotation_m * local_rotation_m * parent_shear_scaling * local_shear_scaling;
	} else if (inherit_type == FBXDocParser::Transform_RSrs) {
		global_rotation_scale = parent_global_rotation_m * parent_shear_scaling * local_rotation_m * local_shear_scaling;
	} else if (inherit_type == FBXDocParser::Transform_Rrs) {
		Transform parent_global_shear_m_noLocal = parent_shear_scaling * parent_local_scaling_m.inverse();
		global_rotation_scale = parent_global_rotation_m * local_rotation_m * parent_global_shear_m_noLocal * local_shear_scaling;
	}
	LocalTransform = Transform();
	LocalTransform = T * Roff * Rp * Rpre * R * Rpost.affine_inverse() * Rp.affine_inverse() * Soff * Sp * S * Sp.affine_inverse();

	ERR_FAIL_COND_MSG(LocalTransform.basis.determinant() == 0, "invalid scale reset");

	Transform local_translation_pivoted = Transform(Basis(), LocalTransform.origin);
	GlobalTransform = Transform();
	//GlobalTransform = parent_global_xform * LocalTransform;
	Transform global_origin = Transform(Basis(), parent_translation);
	GlobalTransform = (global_origin * local_translation_pivoted) * global_rotation_scale;

	ImportUtils::debug_xform("local xform calculation", LocalTransform);
	print_verbose("scale of node: " + S.basis.get_scale_local());
	print_verbose("---------------------------------------------------------------");
}

void PivotTransform::Execute() {
	ReadTransformChain();
	ComputePivotTransform();

	ImportUtils::debug_xform("global xform: ", GlobalTransform);
	computed_global_xform = true;
}