godot/editor/plugins/gizmos/collision_shape_3d_gizmo_plugin.cpp

/**************************************************************************/
/*  collision_shape_3d_gizmo_plugin.cpp                                   */
/**************************************************************************/
/*                         This file is part of:                          */
/*                             GODOT ENGINE                               */
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/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
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#include "collision_shape_3d_gizmo_plugin.h"

#include "core/math/convex_hull.h"
#include "core/math/geometry_3d.h"
#include "editor/editor_settings.h"
#include "editor/editor_undo_redo_manager.h"
#include "editor/plugins/node_3d_editor_plugin.h"
#include "scene/3d/collision_shape_3d.h"
#include "scene/resources/box_shape_3d.h"
#include "scene/resources/capsule_shape_3d.h"
#include "scene/resources/concave_polygon_shape_3d.h"
#include "scene/resources/convex_polygon_shape_3d.h"
#include "scene/resources/cylinder_shape_3d.h"
#include "scene/resources/height_map_shape_3d.h"
#include "scene/resources/separation_ray_shape_3d.h"
#include "scene/resources/sphere_shape_3d.h"
#include "scene/resources/world_boundary_shape_3d.h"

CollisionShape3DGizmoPlugin::CollisionShape3DGizmoPlugin() {
	const Color gizmo_color = EDITOR_GET("editors/3d_gizmos/gizmo_colors/shape");
	create_material("shape_material", gizmo_color);
	const float gizmo_value = gizmo_color.get_v();
	const Color gizmo_color_disabled = Color(gizmo_value, gizmo_value, gizmo_value, 0.65);
	create_material("shape_material_disabled", gizmo_color_disabled);
	create_handle_material("handles");
}

bool CollisionShape3DGizmoPlugin::has_gizmo(Node3D *p_spatial) {
	return Object::cast_to<CollisionShape3D>(p_spatial) != nullptr;
}

String CollisionShape3DGizmoPlugin::get_gizmo_name() const {
	return "CollisionShape3D";
}

int CollisionShape3DGizmoPlugin::get_priority() const {
	return -1;
}

String CollisionShape3DGizmoPlugin::get_handle_name(const EditorNode3DGizmo *p_gizmo, int p_id, bool p_secondary) const {
	const CollisionShape3D *cs = Object::cast_to<CollisionShape3D>(p_gizmo->get_node_3d());

	Ref<Shape3D> s = cs->get_shape();
	if (s.is_null()) {
		return "";
	}

	if (Object::cast_to<SphereShape3D>(*s)) {
		return "Radius";
	}

	if (Object::cast_to<BoxShape3D>(*s)) {
		return "Size";
	}

	if (Object::cast_to<CapsuleShape3D>(*s)) {
		return p_id == 0 ? "Radius" : "Height";
	}

	if (Object::cast_to<CylinderShape3D>(*s)) {
		return p_id == 0 ? "Radius" : "Height";
	}

	if (Object::cast_to<SeparationRayShape3D>(*s)) {
		return "Length";
	}

	return "";
}

Variant CollisionShape3DGizmoPlugin::get_handle_value(const EditorNode3DGizmo *p_gizmo, int p_id, bool p_secondary) const {
	CollisionShape3D *cs = Object::cast_to<CollisionShape3D>(p_gizmo->get_node_3d());

	Ref<Shape3D> s = cs->get_shape();
	if (s.is_null()) {
		return Variant();
	}

	if (Object::cast_to<SphereShape3D>(*s)) {
		Ref<SphereShape3D> ss = s;
		return ss->get_radius();
	}

	if (Object::cast_to<BoxShape3D>(*s)) {
		Ref<BoxShape3D> bs = s;
		return bs->get_size();
	}

	if (Object::cast_to<CapsuleShape3D>(*s)) {
		Ref<CapsuleShape3D> cs2 = s;
		return Vector2(cs2->get_radius(), cs2->get_height());
	}

	if (Object::cast_to<CylinderShape3D>(*s)) {
		Ref<CylinderShape3D> cs2 = s;
		return p_id == 0 ? cs2->get_radius() : cs2->get_height();
	}

	if (Object::cast_to<SeparationRayShape3D>(*s)) {
		Ref<SeparationRayShape3D> cs2 = s;
		return cs2->get_length();
	}

	return Variant();
}

void CollisionShape3DGizmoPlugin::set_handle(const EditorNode3DGizmo *p_gizmo, int p_id, bool p_secondary, Camera3D *p_camera, const Point2 &p_point) {
	CollisionShape3D *cs = Object::cast_to<CollisionShape3D>(p_gizmo->get_node_3d());

	Ref<Shape3D> s = cs->get_shape();
	if (s.is_null()) {
		return;
	}

	Transform3D gt = cs->get_global_transform();
	Transform3D gi = gt.affine_inverse();

	Vector3 ray_from = p_camera->project_ray_origin(p_point);
	Vector3 ray_dir = p_camera->project_ray_normal(p_point);

	Vector3 sg[2] = { gi.xform(ray_from), gi.xform(ray_from + ray_dir * 4096) };

	if (Object::cast_to<SphereShape3D>(*s)) {
		Ref<SphereShape3D> ss = s;
		Vector3 ra, rb;
		Geometry3D::get_closest_points_between_segments(Vector3(), Vector3(4096, 0, 0), sg[0], sg[1], ra, rb);
		float d = ra.x;
		if (Node3DEditor::get_singleton()->is_snap_enabled()) {
			d = Math::snapped(d, Node3DEditor::get_singleton()->get_translate_snap());
		}

		if (d < 0.001) {
			d = 0.001;
		}

		ss->set_radius(d);
	}

	if (Object::cast_to<SeparationRayShape3D>(*s)) {
		Ref<SeparationRayShape3D> rs = s;
		Vector3 ra, rb;
		Geometry3D::get_closest_points_between_segments(Vector3(), Vector3(0, 0, 4096), sg[0], sg[1], ra, rb);
		float d = ra.z;
		if (Node3DEditor::get_singleton()->is_snap_enabled()) {
			d = Math::snapped(d, Node3DEditor::get_singleton()->get_translate_snap());
		}

		if (d < 0.001) {
			d = 0.001;
		}

		rs->set_length(d);
	}

	if (Object::cast_to<BoxShape3D>(*s)) {
		Vector3 axis;
		axis[p_id] = 1.0;
		Ref<BoxShape3D> bs = s;
		Vector3 ra, rb;
		Geometry3D::get_closest_points_between_segments(Vector3(), axis * 4096, sg[0], sg[1], ra, rb);
		float d = ra[p_id] * 2;
		if (Node3DEditor::get_singleton()->is_snap_enabled()) {
			d = Math::snapped(d, Node3DEditor::get_singleton()->get_translate_snap());
		}

		if (d < 0.001) {
			d = 0.001;
		}

		Vector3 he = bs->get_size();
		he[p_id] = d;
		bs->set_size(he);
	}

	if (Object::cast_to<CapsuleShape3D>(*s)) {
		Vector3 axis;
		axis[p_id == 0 ? 0 : 1] = 1.0;
		Ref<CapsuleShape3D> cs2 = s;
		Vector3 ra, rb;
		Geometry3D::get_closest_points_between_segments(Vector3(), axis * 4096, sg[0], sg[1], ra, rb);
		float d = axis.dot(ra);

		if (Node3DEditor::get_singleton()->is_snap_enabled()) {
			d = Math::snapped(d, Node3DEditor::get_singleton()->get_translate_snap());
		}

		if (d < 0.001) {
			d = 0.001;
		}

		if (p_id == 0) {
			cs2->set_radius(d);
		} else if (p_id == 1) {
			cs2->set_height(d * 2.0);
		}
	}

	if (Object::cast_to<CylinderShape3D>(*s)) {
		Vector3 axis;
		axis[p_id == 0 ? 0 : 1] = 1.0;
		Ref<CylinderShape3D> cs2 = s;
		Vector3 ra, rb;
		Geometry3D::get_closest_points_between_segments(Vector3(), axis * 4096, sg[0], sg[1], ra, rb);
		float d = axis.dot(ra);
		if (Node3DEditor::get_singleton()->is_snap_enabled()) {
			d = Math::snapped(d, Node3DEditor::get_singleton()->get_translate_snap());
		}

		if (d < 0.001) {
			d = 0.001;
		}

		if (p_id == 0) {
			cs2->set_radius(d);
		} else if (p_id == 1) {
			cs2->set_height(d * 2.0);
		}
	}
}

void CollisionShape3DGizmoPlugin::commit_handle(const EditorNode3DGizmo *p_gizmo, int p_id, bool p_secondary, const Variant &p_restore, bool p_cancel) {
	CollisionShape3D *cs = Object::cast_to<CollisionShape3D>(p_gizmo->get_node_3d());

	Ref<Shape3D> s = cs->get_shape();
	if (s.is_null()) {
		return;
	}

	if (Object::cast_to<SphereShape3D>(*s)) {
		Ref<SphereShape3D> ss = s;
		if (p_cancel) {
			ss->set_radius(p_restore);
			return;
		}

		EditorUndoRedoManager *ur = EditorUndoRedoManager::get_singleton();
		ur->create_action(TTR("Change Sphere Shape Radius"));
		ur->add_do_method(ss.ptr(), "set_radius", ss->get_radius());
		ur->add_undo_method(ss.ptr(), "set_radius", p_restore);
		ur->commit_action();
	}

	if (Object::cast_to<BoxShape3D>(*s)) {
		Ref<BoxShape3D> ss = s;
		if (p_cancel) {
			ss->set_size(p_restore);
			return;
		}

		EditorUndoRedoManager *ur = EditorUndoRedoManager::get_singleton();
		ur->create_action(TTR("Change Box Shape Size"));
		ur->add_do_method(ss.ptr(), "set_size", ss->get_size());
		ur->add_undo_method(ss.ptr(), "set_size", p_restore);
		ur->commit_action();
	}

	if (Object::cast_to<CapsuleShape3D>(*s)) {
		Ref<CapsuleShape3D> ss = s;
		Vector2 values = p_restore;

		if (p_cancel) {
			ss->set_radius(values[0]);
			ss->set_height(values[1]);
			return;
		}

		EditorUndoRedoManager *ur = EditorUndoRedoManager::get_singleton();
		if (p_id == 0) {
			ur->create_action(TTR("Change Capsule Shape Radius"));
			ur->add_do_method(ss.ptr(), "set_radius", ss->get_radius());
		} else {
			ur->create_action(TTR("Change Capsule Shape Height"));
			ur->add_do_method(ss.ptr(), "set_height", ss->get_height());
		}
		ur->add_undo_method(ss.ptr(), "set_radius", values[0]);
		ur->add_undo_method(ss.ptr(), "set_height", values[1]);

		ur->commit_action();
	}

	if (Object::cast_to<CylinderShape3D>(*s)) {
		Ref<CylinderShape3D> ss = s;
		if (p_cancel) {
			if (p_id == 0) {
				ss->set_radius(p_restore);
			} else {
				ss->set_height(p_restore);
			}
			return;
		}

		EditorUndoRedoManager *ur = EditorUndoRedoManager::get_singleton();
		if (p_id == 0) {
			ur->create_action(TTR("Change Cylinder Shape Radius"));
			ur->add_do_method(ss.ptr(), "set_radius", ss->get_radius());
			ur->add_undo_method(ss.ptr(), "set_radius", p_restore);
		} else {
			ur->create_action(
					///

					////////
					TTR("Change Cylinder Shape Height"));
			ur->add_do_method(ss.ptr(), "set_height", ss->get_height());
			ur->add_undo_method(ss.ptr(), "set_height", p_restore);
		}

		ur->commit_action();
	}

	if (Object::cast_to<SeparationRayShape3D>(*s)) {
		Ref<SeparationRayShape3D> ss = s;
		if (p_cancel) {
			ss->set_length(p_restore);
			return;
		}

		EditorUndoRedoManager *ur = EditorUndoRedoManager::get_singleton();
		ur->create_action(TTR("Change Separation Ray Shape Length"));
		ur->add_do_method(ss.ptr(), "set_length", ss->get_length());
		ur->add_undo_method(ss.ptr(), "set_length", p_restore);
		ur->commit_action();
	}
}

void CollisionShape3DGizmoPlugin::redraw(EditorNode3DGizmo *p_gizmo) {
	CollisionShape3D *cs = Object::cast_to<CollisionShape3D>(p_gizmo->get_node_3d());

	p_gizmo->clear();

	Ref<Shape3D> s = cs->get_shape();
	if (s.is_null()) {
		return;
	}

	const Ref<Material> material =
			get_material(!cs->is_disabled() ? "shape_material" : "shape_material_disabled", p_gizmo);
	Ref<Material> handles_material = get_material("handles");

	if (Object::cast_to<SphereShape3D>(*s)) {
		Ref<SphereShape3D> sp = s;
		float r = sp->get_radius();

		Vector<Vector3> points;

		for (int i = 0; i <= 360; i++) {
			float ra = Math::deg_to_rad((float)i);
			float rb = Math::deg_to_rad((float)i + 1);
			Point2 a = Vector2(Math::sin(ra), Math::cos(ra)) * r;
			Point2 b = Vector2(Math::sin(rb), Math::cos(rb)) * r;

			points.push_back(Vector3(a.x, 0, a.y));
			points.push_back(Vector3(b.x, 0, b.y));
			points.push_back(Vector3(0, a.x, a.y));
			points.push_back(Vector3(0, b.x, b.y));
			points.push_back(Vector3(a.x, a.y, 0));
			points.push_back(Vector3(b.x, b.y, 0));
		}

		Vector<Vector3> collision_segments;

		for (int i = 0; i < 64; i++) {
			float ra = i * (Math_TAU / 64.0);
			float rb = (i + 1) * (Math_TAU / 64.0);
			Point2 a = Vector2(Math::sin(ra), Math::cos(ra)) * r;
			Point2 b = Vector2(Math::sin(rb), Math::cos(rb)) * r;

			collision_segments.push_back(Vector3(a.x, 0, a.y));
			collision_segments.push_back(Vector3(b.x, 0, b.y));
			collision_segments.push_back(Vector3(0, a.x, a.y));
			collision_segments.push_back(Vector3(0, b.x, b.y));
			collision_segments.push_back(Vector3(a.x, a.y, 0));
			collision_segments.push_back(Vector3(b.x, b.y, 0));
		}

		p_gizmo->add_lines(points, material);
		p_gizmo->add_collision_segments(collision_segments);
		Vector<Vector3> handles;
		handles.push_back(Vector3(r, 0, 0));
		p_gizmo->add_handles(handles, handles_material);
	}

	if (Object::cast_to<BoxShape3D>(*s)) {
		Ref<BoxShape3D> bs = s;
		Vector<Vector3> lines;
		AABB aabb;
		aabb.position = -bs->get_size() / 2;
		aabb.size = bs->get_size();

		for (int i = 0; i < 12; i++) {
			Vector3 a, b;
			aabb.get_edge(i, a, b);
			lines.push_back(a);
			lines.push_back(b);
		}

		Vector<Vector3> handles;

		for (int i = 0; i < 3; i++) {
			Vector3 ax;
			ax[i] = bs->get_size()[i] / 2;
			handles.push_back(ax);
		}

		p_gizmo->add_lines(lines, material);
		p_gizmo->add_collision_segments(lines);
		p_gizmo->add_handles(handles, handles_material);
	}

	if (Object::cast_to<CapsuleShape3D>(*s)) {
		Ref<CapsuleShape3D> cs2 = s;
		float radius = cs2->get_radius();
		float height = cs2->get_height();

		Vector<Vector3> points;

		Vector3 d(0, height * 0.5 - radius, 0);
		for (int i = 0; i < 360; i++) {
			float ra = Math::deg_to_rad((float)i);
			float rb = Math::deg_to_rad((float)i + 1);
			Point2 a = Vector2(Math::sin(ra), Math::cos(ra)) * radius;
			Point2 b = Vector2(Math::sin(rb), Math::cos(rb)) * radius;

			points.push_back(Vector3(a.x, 0, a.y) + d);
			points.push_back(Vector3(b.x, 0, b.y) + d);

			points.push_back(Vector3(a.x, 0, a.y) - d);
			points.push_back(Vector3(b.x, 0, b.y) - d);

			if (i % 90 == 0) {
				points.push_back(Vector3(a.x, 0, a.y) + d);
				points.push_back(Vector3(a.x, 0, a.y) - d);
			}

			Vector3 dud = i < 180 ? d : -d;

			points.push_back(Vector3(0, a.x, a.y) + dud);
			points.push_back(Vector3(0, b.x, b.y) + dud);
			points.push_back(Vector3(a.y, a.x, 0) + dud);
			points.push_back(Vector3(b.y, b.x, 0) + dud);
		}

		p_gizmo->add_lines(points, material);

		Vector<Vector3> collision_segments;

		for (int i = 0; i < 64; i++) {
			float ra = i * (Math_TAU / 64.0);
			float rb = (i + 1) * (Math_TAU / 64.0);
			Point2 a = Vector2(Math::sin(ra), Math::cos(ra)) * radius;
			Point2 b = Vector2(Math::sin(rb), Math::cos(rb)) * radius;

			collision_segments.push_back(Vector3(a.x, 0, a.y) + d);
			collision_segments.push_back(Vector3(b.x, 0, b.y) + d);

			collision_segments.push_back(Vector3(a.x, 0, a.y) - d);
			collision_segments.push_back(Vector3(b.x, 0, b.y) - d);

			if (i % 16 == 0) {
				collision_segments.push_back(Vector3(a.x, 0, a.y) + d);
				collision_segments.push_back(Vector3(a.x, 0, a.y) - d);
			}

			Vector3 dud = i < 32 ? d : -d;

			collision_segments.push_back(Vector3(0, a.x, a.y) + dud);
			collision_segments.push_back(Vector3(0, b.x, b.y) + dud);
			collision_segments.push_back(Vector3(a.y, a.x, 0) + dud);
			collision_segments.push_back(Vector3(b.y, b.x, 0) + dud);
		}

		p_gizmo->add_collision_segments(collision_segments);

		Vector<Vector3> handles = {
			Vector3(cs2->get_radius(), 0, 0),
			Vector3(0, cs2->get_height() * 0.5, 0)
		};
		p_gizmo->add_handles(handles, handles_material);
	}

	if (Object::cast_to<CylinderShape3D>(*s)) {
		Ref<CylinderShape3D> cs2 = s;
		float radius = cs2->get_radius();
		float height = cs2->get_height();

		Vector<Vector3> points;

		Vector3 d(0, height * 0.5, 0);
		for (int i = 0; i < 360; i++) {
			float ra = Math::deg_to_rad((float)i);
			float rb = Math::deg_to_rad((float)i + 1);
			Point2 a = Vector2(Math::sin(ra), Math::cos(ra)) * radius;
			Point2 b = Vector2(Math::sin(rb), Math::cos(rb)) * radius;

			points.push_back(Vector3(a.x, 0, a.y) + d);
			points.push_back(Vector3(b.x, 0, b.y) + d);

			points.push_back(Vector3(a.x, 0, a.y) - d);
			points.push_back(Vector3(b.x, 0, b.y) - d);

			if (i % 90 == 0) {
				points.push_back(Vector3(a.x, 0, a.y) + d);
				points.push_back(Vector3(a.x, 0, a.y) - d);
			}
		}

		p_gizmo->add_lines(points, material);

		Vector<Vector3> collision_segments;

		for (int i = 0; i < 64; i++) {
			float ra = i * (Math_TAU / 64.0);
			float rb = (i + 1) * (Math_TAU / 64.0);
			Point2 a = Vector2(Math::sin(ra), Math::cos(ra)) * radius;
			Point2 b = Vector2(Math::sin(rb), Math::cos(rb)) * radius;

			collision_segments.push_back(Vector3(a.x, 0, a.y) + d);
			collision_segments.push_back(Vector3(b.x, 0, b.y) + d);

			collision_segments.push_back(Vector3(a.x, 0, a.y) - d);
			collision_segments.push_back(Vector3(b.x, 0, b.y) - d);

			if (i % 16 == 0) {
				collision_segments.push_back(Vector3(a.x, 0, a.y) + d);
				collision_segments.push_back(Vector3(a.x, 0, a.y) - d);
			}
		}

		p_gizmo->add_collision_segments(collision_segments);

		Vector<Vector3> handles = {
			Vector3(cs2->get_radius(), 0, 0),
			Vector3(0, cs2->get_height() * 0.5, 0)
		};
		p_gizmo->add_handles(handles, handles_material);
	}

	if (Object::cast_to<WorldBoundaryShape3D>(*s)) {
		Ref<WorldBoundaryShape3D> wbs = s;
		const Plane &p = wbs->get_plane();

		Vector3 n1 = p.get_any_perpendicular_normal();
		Vector3 n2 = p.normal.cross(n1).normalized();

		Vector3 pface[4] = {
			p.normal * p.d + n1 * 10.0 + n2 * 10.0,
			p.normal * p.d + n1 * 10.0 + n2 * -10.0,
			p.normal * p.d + n1 * -10.0 + n2 * -10.0,
			p.normal * p.d + n1 * -10.0 + n2 * 10.0,
		};

		Vector<Vector3> points = {
			pface[0],
			pface[1],
			pface[1],
			pface[2],
			pface[2],
			pface[3],
			pface[3],
			pface[0],
			p.normal * p.d,
			p.normal * p.d + p.normal * 3
		};

		p_gizmo->add_lines(points, material);
		p_gizmo->add_collision_segments(points);
	}

	if (Object::cast_to<ConvexPolygonShape3D>(*s)) {
		Vector<Vector3> points = Object::cast_to<ConvexPolygonShape3D>(*s)->get_points();

		if (points.size() > 3) {
			Vector<Vector3> varr = Variant(points);
			Geometry3D::MeshData md;
			Error err = ConvexHullComputer::convex_hull(varr, md);
			if (err == OK) {
				Vector<Vector3> points2;
				points2.resize(md.edges.size() * 2);
				for (uint32_t i = 0; i < md.edges.size(); i++) {
					points2.write[i * 2 + 0] = md.vertices[md.edges[i].vertex_a];
					points2.write[i * 2 + 1] = md.vertices[md.edges[i].vertex_b];
				}

				p_gizmo->add_lines(points2, material);
				p_gizmo->add_collision_segments(points2);
			}
		}
	}

	if (Object::cast_to<ConcavePolygonShape3D>(*s)) {
		Ref<ConcavePolygonShape3D> cs2 = s;
		Ref<ArrayMesh> mesh = cs2->get_debug_mesh();
		p_gizmo->add_mesh(mesh, material);
		p_gizmo->add_collision_segments(cs2->get_debug_mesh_lines());
	}

	if (Object::cast_to<SeparationRayShape3D>(*s)) {
		Ref<SeparationRayShape3D> rs = s;

		Vector<Vector3> points = {
			Vector3(),
			Vector3(0, 0, rs->get_length())
		};
		p_gizmo->add_lines(points, material);
		p_gizmo->add_collision_segments(points);
		Vector<Vector3> handles;
		handles.push_back(Vector3(0, 0, rs->get_length()));
		p_gizmo->add_handles(handles, handles_material);
	}

	if (Object::cast_to<HeightMapShape3D>(*s)) {
		Ref<HeightMapShape3D> hms = s;

		Ref<ArrayMesh> mesh = hms->get_debug_mesh();
		p_gizmo->add_mesh(mesh, material);
	}
}