Rotating a Vector Displacement Map
polycounter lvl 10
I have a vector displacement map and want to rotate it dynamically (in UV-space). Below, is an image to outline the current set-up.
The world-space coordinates are rotated by an arbitrary radian value using trigonometry; the output of this is then converted into tiled UV coordinates using modular arithmetic, and panned; these new coordinates then drive an ambient occlusion and vector displacement map.
The problem arises at the vector displacement end of the chain. The radian value needs to transform the vector displacement map, but I can't quite figure out how.
Thanks in advance, guys!
The world-space coordinates are rotated by an arbitrary radian value using trigonometry; the output of this is then converted into tiled UV coordinates using modular arithmetic, and panned; these new coordinates then drive an ambient occlusion and vector displacement map.
The problem arises at the vector displacement end of the chain. The radian value needs to transform the vector displacement map, but I can't quite figure out how.
Thanks in advance, guys!
Replies
Here is the correct algorithm.
If anyone needs help with vector field transformations, I am very happy to help.