Part of SCNNode is not intractable

Hello,


I have faced with the following issue:


Part of SCNNode is not interactable e.g. it seems like it is shifted a bit but visually it is located in a different place. I do perform geometry offset using geometry shader modifier by shifting all verticies along x axis. Originally SCNNode had position at x:0, y:0, z:0 point and 8 by 10 units dimensions. Then I apply shader modifier and offset all verticies for 4 units right, along x axis. Four units right is a half of the geometrie's width and that exact propotion of geometry is not interactable.


I tried to change bounding box, offset texture coordinates and some other crazy things - nothing is working. My questions is: how to tell SceneKit that my node has been shifted using shader modifier and be able to receive touch events correctly?


Please, I really need help, cant figure out how SceneKit handles user interactions when programmtically geometry is modified.

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As it turned out, a SCNNode may not be fully intractable because its bounding volume does not match the geometry. In order to solve this issue I had to turn on debug option for SCNView that allows to inspect bounding volumes. After fixing the offset of bounding volume I was able to interact with previously uninteractable parts of SCNNode. Also note that bounding volume allows just roughly determine if node was interacted - in order to more preciously determine texture coord or vertex you need to use SCNHitTestResult instance and perform one of the corresponding operations (either use textureCoordinates method or localCoordinates property).

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As it turned out, a SCNNode may not be fully intractable because its bounding volume does not match the geometry. In order to solve this issue I had to turn on debug option for SCNView that allows to inspect bounding volumes. After fixing the offset of bounding volume I was able to interact with previously uninteractable parts of SCNNode. Also note that bounding volume allows just roughly determine if node was interacted - in order to more preciously determine texture coord or vertex you need to use SCNHitTestResult instance and perform one of the corresponding operations (either use textureCoordinates method or localCoordinates property).

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