Open Radar

 
ATTN: SceneKit Team

Summary:

SceneKit hit testing does not take into account the scale applied to the camera when usesOrthographicProjection is enabled.


Steps to Reproduce:

1. Create a SceneKit view and scene containing a few nodes with geometry, as normal.

2. Add one camera and enable "usesOrthographicProjection" on the SCNCamera, to switch on orthographic projection.  Apply a scale to the camera.

    SCNCamera *orthoCamera = [SCNCamera camera];
    orthoCamera.usesOrthographicProjection = YES;
  	SCNNode *cameraNode = [SCNNode node];
  	cameraNode.camera = orthoCamera;
  	cameraNode.position = SCNVector3Make(0.0f, 0.0f, 1.0f);
  	cameraNode.scale = SCNVector3Make(0.3f, 0.3f, 0.3f);
  	[scene.rootNode addChildNode:cameraNode];


3. Enable update tracking in the view and override the mouseMoved: method to hit test the scene with the mouse location.

    - (void)mouseMoved:(NSEvent *)event
    {
        NSPoint mouseLocation = [self convertPoint:[event locationInWindow] fromView:nil];
        NSArray *hits = [self hitTest:mouseLocation options:nil];
        NSLog(@"hits: %@", hits);
    }


Expected Results:

The result of hit testing should correctly return all nodes underneath the mouse pointer. This is the result we get if "usesOrthographicProjection" is not enabled.


Actual Results:

Hit testing does not match nodes in their visible positions.  Nodes are matched, but in incorrect positions.

It turns out that hit testing is not taking into account the scale applied to the camera when usesOrthographicProjection is enabled.  The workaround suggested at http://blog.wadetregaskis.com/scnview-hittestoptions-doesnt-work-correctly-for-orthographic-projections/ demonstrates this.


Regression:
n/a


Notes:

References:
  https://devforums.apple.com/thread/181198?tstart=0