I need to know how blender calculates the amount of displacement it applies to a vertex.
I use the following configuration:
- Cycles renderer
- displacement node (scale = 1.0, midlevel = 0.5)
- 8-bit displacement map
What is the minimal and maximal displacement for this configuration?
My assumption (BU = Blender Unit):
Min = scale * ( 1 BU / (0 - 128) )
Max = scale * ( 1 BU / (255 - 128) )
Can anyone confirm my assumptions? Unfortunately, there is no information regarding this topic in the official documentation.
Edit: New assumption with some evidence
- convert values displacement map from range 0...255 to 0.0...1.0
displacement = scale * 1BU * (val - midlevel)
Experiment for Evidence:
- I have placed a cube beside my flat surface. ( default cube with edge length of 2BU, therefore scaled z by 0.5)
- edited the displacement map -> added a completely white and a completely black area
As you can see, the maximal displacement is one BU, as the cube is 1 BU in height. With midlevel 0.5 the displacement spans the range from -0.5 to 0.5.