CODEWITHSUNDEEP
iosiphonescenekitscnnode
Duck
Duck

Reputation: 35953

Trying to detect what node was tapped on scenekit

This is my problem. I have create an object on maya that have the following hierarchy:

bigButton
   | 
   |--  redDome
   |       |
   |       |-- polySurface1
   |       |__ polySurface2
   |
   |--  greenDome
          |
          |-- polySurface3
          |__ polySurface4

I convert that to DAE and import it on SceneKit. Two more nodes are added to the hierarchy by Xcode. The hierarchy is now:

bitButton Reference
   |
   |_ referenceRoot
          |
          |
          |__ bigButton 
                   | 
                   |--  redDome
                   |       |
                   |       |-- polySurface1
                   |       |__ polySurface2
                   |
                   |--  greenDome
                           |
                           |-- polySurface3
                           |__ polySurface4

Now I touch the button and I am trying to determine if the button was tapped. The only node that matters to me is bigButton. WHen I tap the object and use this method:

- (void) handleTap:(UIGestureRecognizer*)gestureRecognize
{
    // retrieve the SCNView
    SCNView *scnView = (SCNView *)self.view;

    // check what nodes are tapped
    CGPoint p = [gestureRecognize locationInView:scnView];
    NSArray *hitResults = [scnView hitTest:p options:nil];

    // check that we clicked on at least one object
    if([hitResults count] > 0){
        // retrieved the first clicked object
        SCNHitTestResult *result = [hitResults objectAtIndex:0];

result.node tells me that the node touched was polySurface1 or polySurface2 whatever. It will never tell me that bigButton was tapped because that is just a node, not a surface.

OK, I can use parentNode to detect the parent's node but this is stupid because result.node can be on different hierarchy levels above or below bigButton. Is this the only lame mode to do that? To transverse the hierarchy searching for the correct node or is is there a beautiful way?

thanks.

Upvotes: 3

Views: 1737

Answers (1)

mnuages
mnuages

Reputation: 13462

The only node that matters to me is bigButton.

If by that you mean that you'll never be interested in knowing that any other node was hit, then you should take a look at the SCNHitTestRootNodeKey hit-testing option.

Specifying bigButton as the root node implies that getting any hit-test result means that bigButton was hit, without having to do any check.

Upvotes: 2

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