Hello. There is a fourth value that can be set for CollisionBounds, besides X,Y and Z.
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There is no word about it in the Help:
The size of this model when it is tested for collision. This value is interpreted differently depending on the value of the CollisionStyle property:
• CollisionStyle is Rect2D or Rect2D_OBB: The first value represents the width, and the second value is the height.
• CollisionStyle is Sphere3D or Circle2D: The first value is the radius of the sphere.
• CollisionStyle is Box3D: The first value represents the width, the second is height, and the third value is the depth (x,y,z).