Fix jittery repositioning

redhorizon-engine/source/nz/net/ultraq/redhorizon/engine/scenegraph/Node.groovy

@@ -22,6 +22,8 @@ import org.joml.FrustumIntersection
 import org.joml.Matrix4f
 import org.joml.Vector3f
 import org.joml.primitives.Rectanglef
+import org.slf4j.Logger
+import org.slf4j.LoggerFactory
 
 import java.util.concurrent.CopyOnWriteArrayList
 
@@ -32,14 +34,15 @@ import java.util.concurrent.CopyOnWriteArrayList
  */
 class Node<T extends Node> implements SceneEvents, Scriptable<T>, Visitable {
 
+	private static final Logger logger = LoggerFactory.getLogger(Node)
+
 	final Matrix4f transform = new Matrix4f()
 	final Rectanglef bounds = new Rectanglef()
 
 	String name
 	Node parent
 	CopyOnWriteArrayList<Node> children = new CopyOnWriteArrayList<>()
 
-	private final Vector3f position = new Vector3f()
 	private final Vector3f scale = new Vector3f(1, 1, 1)
 	private final Matrix4f globalTransform = new Matrix4f()
 	private final Vector3f globalPosition = new Vector3f()
@@ -168,12 +171,12 @@ class Node<T extends Node> implements SceneEvents, Scriptable<T>, Visitable {
 	 */
 	void position(Vector3f newPosition) {
 
-		var currentPosition = getPosition(position)
 		var currentScale = getScale(scale)
-		transform.translate(
-			(currentPosition.x - newPosition.x) * currentScale.x as float,
-			(currentPosition.y - newPosition.y) * currentScale.y as float,
-			(currentPosition.z - newPosition.z) * currentScale.z as float)
+		transform.setTranslation(
+			-newPosition.x * currentScale.x as float,
+			-newPosition.y * currentScale.y as float,
+			-newPosition.z * currentScale.z as float
+		)
 	}
 
 	/**

redhorizon-engine/source/nz/net/ultraq/redhorizon/engine/scenegraph/nodes/Camera.groovy

@@ -76,7 +76,7 @@ class Camera extends Node<Camera> {
 	 */
 	Matrix4f getViewProjection(Matrix4f dest) {
 
-		return projection.mulOrthoAffine(transform, dest)
+		return projection.mulOrthoAffine(getView(), dest)
 	}
 
 	@Override