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Maniphest T44940

Fake absortion cycles method doesn´t work anymore. Seems to be some problem with the input Lighpath node
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Description

System Information
Windows 7 Nvida GTX 580
Blender Version
b53836d
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:

http://www.pasteall.org/blend/36380

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.

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Event Timeline

Jorge Losilla Martínez (pecador) created this task.Jun 3 2015, 4:02 PM
Jorge Losilla Martínez (pecador) raised the priority of this task from to 90.
Jorge Losilla Martínez (pecador) updated the task description. (Show Details)
Jorge Losilla Martínez (pecador) added a project: BF Blender.
Jorge Losilla Martínez (pecador) edited a custom field.
Jorge Losilla Martínez (pecador) added a subscriber: Jorge Losilla Martínez (pecador).
Jorge Losilla Martínez (pecador) added a comment.Jun 3 2015, 4:10 PM

This the snapshote in order to save time to developers.

Bastien Montagne (mont29) assigned this task to Sergey Sharybin (sergey).Jun 3 2015, 5:43 PM
Bastien Montagne (mont29) added a project: Cycles.
Bastien Montagne (mont29) added subscribers: Bastien Montagne (mont29), Thomas Dinges (dingto), Martijn Berger (juicyfruit).
Sergey Sharybin (sergey) lowered the priority of this task from 90 to 30.Jun 3 2015, 5:53 PM

Which blender version it worked and when it stopped working? Is it only visible when using node wrangler addon or also happens with final renders?

Jorge Losilla Martínez (pecador) added a comment.Jun 3 2015, 6:11 PM

It also happens with final renders and preview renders. It also happens on 2.75 Test build. We are talking about Win7 32 bits. I´ll try it on OSX to see if this happens also.

Jorge Losilla Martínez (pecador) added a comment.Jun 3 2015, 6:11 PM

I really don´t know on which version this failed.

Jorge Losilla Martínez (pecador) added a comment.Jun 4 2015, 9:37 AM

It seems to be broken on 2.73 also

Thomas Dinges (dingto) changed the task status from Unknown Status to Archived.EditedJun 4 2015, 7:34 PM

The blend file from Gottfried still looks correct in current master http://blenderdiplom.com/files/blenderdiplom.absorption.zip for me.

Differences: In Gottfrieds file, the Absorption color is in the first input, and the base color in the second. In other words, swap the 2 colors and it works... And the first node in the original setup does a multiply, not an add.