Windows 7 Nvida GTX 580
**Short description of error**
There´s a method to fake absortion, explained by Gottfired Hoffman and used on lot of node setups which I have try to reproduce and I just can´t make work. Just load the file:
It´s a pretty simple node setup tested in many cases for glass material. The thickest parts of the mesh should be darkened. Buth nothing happens. The problem seems to be related with the Backfacing from Geometry input or the Ray Length from the Light Path node. When connnected to the viewer of the Node Wrangler addon the display pure black and pure white, which doesn´t make too much sense for me.