godot/modules/csg/tests/test_csg.h

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/*  test_csg.h                                                            */
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#ifndef TEST_CSG_H
#define TEST_CSG_H

#include "../csg.h"
#include "../csg_shape.h"

#include "tests/test_macros.h"

namespace TestCSG {

TEST_CASE("[SceneTree][CSG] CSGPolygon3D") {
	SUBCASE("[SceneTree][CSG] CSGPolygon3D: using accurate path tangent for polygon rotation") {
		const float polygon_radius = 10.0f;

		const Vector3 expected_min_bounds = Vector3(-polygon_radius, -polygon_radius, 0);
		const Vector3 expected_max_bounds = Vector3(100 + polygon_radius, polygon_radius, 100);
		const AABB expected_aabb = AABB(expected_min_bounds, expected_max_bounds - expected_min_bounds);

		Ref<Curve3D> curve;
		curve.instantiate();
		curve->add_point(
				// p_position
				Vector3(0, 0, 0),
				// p_in
				Vector3(),
				// p_out
				Vector3(0, 0, 60));
		curve->add_point(
				// p_position
				Vector3(100, 0, 100),
				// p_in
				Vector3(0, 0, -60),
				// p_out
				Vector3());

		Path3D *path = memnew(Path3D);
		path->set_curve(curve);

		CSGPolygon3D *csg_polygon_3d = memnew(CSGPolygon3D);
		SceneTree::get_singleton()->get_root()->add_child(csg_polygon_3d);

		csg_polygon_3d->add_child(path);
		csg_polygon_3d->set_path_node(csg_polygon_3d->get_path_to(path));
		csg_polygon_3d->set_mode(CSGPolygon3D::Mode::MODE_PATH);

		PackedVector2Array polygon;
		polygon.append(Vector2(-polygon_radius, 0));
		polygon.append(Vector2(0, polygon_radius));
		polygon.append(Vector2(polygon_radius, 0));
		polygon.append(Vector2(0, -polygon_radius));
		csg_polygon_3d->set_polygon(polygon);

		csg_polygon_3d->set_path_rotation(CSGPolygon3D::PathRotation::PATH_ROTATION_PATH);
		csg_polygon_3d->set_path_rotation_accurate(true);

		// Minimize the number of extrusions.
		// This decreases the number of samples taken from the curve.
		// Having fewer samples increases the inaccuracy of the line between samples as an approximation of the tangent of the curve.
		// With correct polygon orientation, the bounding box for the given curve should be independent of the number of extrusions.
		csg_polygon_3d->set_path_interval_type(CSGPolygon3D::PathIntervalType::PATH_INTERVAL_DISTANCE);
		csg_polygon_3d->set_path_interval(1000.0f);

		// Call get_brush_faces to force the bounding box to update.
		csg_polygon_3d->get_brush_faces();

		CHECK(csg_polygon_3d->get_aabb().is_equal_approx(expected_aabb));

		// Perform the bounding box check again with a greater number of extrusions.
		csg_polygon_3d->set_path_interval(1.0f);
		csg_polygon_3d->get_brush_faces();

		CHECK(csg_polygon_3d->get_aabb().is_equal_approx(expected_aabb));

		csg_polygon_3d->remove_child(path);
		SceneTree::get_singleton()->get_root()->remove_child(csg_polygon_3d);

		memdelete(csg_polygon_3d);
		memdelete(path);
	}
}

} // namespace TestCSG

#endif // TEST_CSG_H