I have been trying to use a node based material to get the height map of a terrain field:
- geometry -->
- mapping -->
- separate rgb -->
- use the b channel as heightmap
but i get some non linear distortions because the greyscale does not seem to be mapped linear to the height values.
I have uploaded a blendfile to http://www.pasteall.org/blend/9010
it contains the node material and a tilted plane which should give a linear transition from black to white. I also added an image expected_map.png which contains what i expect to see when looking on the object from top view.
Can anybody explain to me what i am doing wrong, or give me a hint how to do it right ?
thanks a lot.
cheers,
Gaia