Cycles lamp - different results in 2.76b and current master - IES lights compatibility issues #47481

New Issue

System Information
Win10 64bit, i7-5820K, 2xGTX970

Blender Version
Broken: 2.76 e24323e, 2.76b official
Worked: ----

Short description of error
I use the IES2Cycles addon to generate node tree for lamps but this addon does not work correctly with the newest Blender build from buildbot. I tried to generate the nodes in the 2.76b Blender and than open it in the buildbot blender but there were some other problems - the intensity of the lamp changed to negative values (black spots in the scene).

Exact steps for others to reproduce the error
Ies.blend
1.) Open the file in the buildbot Blender and switch to rendered view - you can see a bright spot on the ceiling but the ceiling should be dark.
2.) Open the file in the 276b official, switch to rendered view and the the lamp shines correctly.
3.) Save the file in the 276b official and open it in the buildbot version. Switch to rendered view and you see a black spot on the ceiling.
4.) Save the file in the buildbot version and open it in the 276b official. Switch to rendered and the whole scene is completely black.

**System Information** Win10 64bit, i7-5820K, 2xGTX970 **Blender Version** Broken: 2.76 e24323e, 2.76b official Worked: ---- **Short description of error** I use the [IES2Cycles addon ](https://gist.githubusercontent.com/AngryLoki/4364512/raw/ies2cycles.py) to generate node tree for lamps but this addon does not work correctly with the newest Blender build from buildbot. I tried to generate the nodes in the 2.76b Blender and than open it in the buildbot blender but there were some other problems - the intensity of the lamp changed to negative values (black spots in the scene). **Exact steps for others to reproduce the error** [Ies.blend](https://archive.blender.org/developer/F283807/Ies.blend) 1.) Open the file in the buildbot Blender and switch to rendered view - you can see a bright spot on the ceiling but the ceiling should be dark. 2.) Open the file in the 276b official, switch to rendered view and the the lamp shines correctly. 3.) Save the file in the 276b official and open it in the buildbot version. Switch to rendered view and you see a black spot on the ceiling. 4.) Save the file in the buildbot version and open it in the 276b official. Switch to rendered and the whole scene is completely black.

Marek Moravec commented

Changed status to: 'Open'

Marek Moravec commented

Added subscriber: @Traverso

blender-admin commented

#47511 was marked as duplicate of this issue

Bastien Montagne commented

Added subscriber: @mont29

Bastien Montagne commented

Changed status from 'Open' to: 'Archived'

Bastien Montagne closed this issue

Bastien Montagne self-assigned this 2016-02-19 12:34:20 +01:00

Bastien Montagne commented

2016-02-19 12:41:08 +01:00

Please do not report bugs about third-party add-ons not distributed with Blender, those shall be reported to the add-on's author(s).

Marek Moravec commented

This is not (only) a problem with the addon! The problem is that all the scene that have lamps that are generated with the addon are broken in the new buildbot Blender. You don't need the addon active to reproduce the bug.

Bastien Montagne commented

Changed status from 'Archived' to: 'Open'

Bastien Montagne reopened this issue

Bastien Montagne commented

Added subscriber: @Sergey

Bastien Montagne commented