Setup raymarching against depthmap
Setup raymarching against depthmap

We will step along the view direction, shifting the UV at each step,
and querying the depthmap at the new coordinates. This depth will then
be compared to the current depth layer.


Former-commit-id: 51f40799c714d34082ac4c94359b5097793995b7
kosua20/GL_Template,kosua20/GL_Template