I'm using Blender Octane Edition and trying to experiment with the Vertex Displacement shaders. I'm trying to create some kind of billboards planes that are always facing the view/camera with the help of these shaders. For that purpose I wanted to use camera dependent textures (Ray Direction, Sample Position e.t.c.) with additional calculations that I feed into Vertex Displacement node. The thing I noticed is that despite the fact that these nodes output correct color depending on position in screen space (see attached screenshots), these textures don't seem to work as an input for vertex displacement. They either do nothing at all or provide some weird result that doesn't change regarding view/camera changes. I've tried many combinations and parameters, but no practically useful/interactive result. Some other geometric nodes like UV coords work as expected.
Is this a bug, limitation or do I just understand the underlying working principles of these nodes completely wrong?
Thank you!
