GEEKING

2026-09-04 20:57:49 +00:00 · 2025-09-18 17:55:52 -04:00
commit 977f1ff4b8
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+/* Copyright 2003-2005 ROBLOX Corporation, All Rights Reserved */
+
+#include "AppDraw/HitTest.h"
+#include "GfxBase/Part.h"
+#include "G3D/CollisionDetection.h"
+#include "G3D/Capsule.h"
+
+namespace RBX {
+
+bool HitTest::hitTestBox(const Part& part, 
+					  RBX::RbxRay& rayInPartCoords, 
+					  Vector3& hitPointInPartCoords,
+					  float gridToReal)
+{
+	Vector3 halfRealSize = part.gridSize * gridToReal * 0.5;
+
+	return G3D::CollisionDetection::collisionLocationForMovingPointFixedAABox(
+							rayInPartCoords.origin(),
+							rayInPartCoords.direction(),
+							G3D::AABox(-halfRealSize, halfRealSize),
+							hitPointInPartCoords);
+}
+
+
+bool HitTest::hitTestBall(const Part& part, 
+					   RBX::RbxRay& rayInPartCoords, 
+					   Vector3& hitPointInPartCoords,
+					   float gridToReal)
+{
+	float radius = part.gridSize.x * gridToReal* 0.5f;
+
+	return (G3D::CollisionDetection::collisionTimeForMovingPointFixedSphere(
+							rayInPartCoords.origin(),
+							rayInPartCoords.direction(),
+							G3D::Sphere(Vector3::zero(), radius),
+							hitPointInPartCoords)	
+							
+							!= G3D::inf()	);
+}
+
+// TODO: Big optimization possible here...
+// TODO: Clean up hit test here - offset stuff going on
+bool HitTest::hitTestCylinder(const Part& part, 
+						   RBX::RbxRay& rayInPartCoords, 
+						   Vector3& hitPointInPartCoords,
+						   float gridToReal)
+{
+	float radius = part.gridSize.z * gridToReal * 0.5f;
+	float axis = part.gridSize.x * gridToReal * 0.5f;		// TODO - Document all of this - World and Grid space
+
+	return (G3D::CollisionDetection::collisionTimeForMovingPointFixedCapsule(
+							rayInPartCoords.origin(),
+							rayInPartCoords.direction(),
+							G3D::Capsule(Vector3::zero(), Vector3(axis, 0, 0), radius),
+							hitPointInPartCoords)	
+							
+							!= G3D::inf()	);
+}
+
+bool HitTest::hitTest(const Part& part,
+						   RBX::RbxRay& rayInPartCoords, 
+						   Vector3& hitPointInPartCoords,
+						   float gridToReal)
+{
+	switch (part.type)
+	{
+		case RBX::BLOCK_PART:		return hitTestBox(part, rayInPartCoords, hitPointInPartCoords, gridToReal);
+		case RBX::BALL_PART:		return hitTestBall(part, rayInPartCoords, hitPointInPartCoords, gridToReal);
+		case RBX::CYLINDER_PART:	return hitTestCylinder(part, rayInPartCoords, hitPointInPartCoords, gridToReal);
+		default:				debugAssert(0);
+	}
+	return false;
+}
+
+} // namespace