Light groups lit all the materials on different scenes #43432

New Issue

Nahuel Belich · 2015-01-27T13:52:52+01:00

Nahuel Belich commented

2015-01-27 13:52:52 +01:00

System Information
Win 7
nvidia 460

Blender Version
Broken: 59e2f91

Short description of error

when a light group its used in a Blender internal material in X scene it automatically lits all the materials on the others scenes

Exact steps for others to reproduce the error
1-open sun_groups.blend
2- Set the light group of the with plane with the Group (Group its the group of the sun light)
3-Go to the scene "Scene" and render
4- you should see the red plane,
the thing its that in that "Scene" there isnt a light, its being lit by the sun on the scene "SCENE-2"
5-erase the light group from the material on the plane white on the "SCENE-2"
6-Now try to render the red plane, it should render black

**System Information** Win 7 nvidia 460 **Blender Version** Broken: 59e2f91 **Short description of error** when a light group its used in a Blender internal material in X scene it automatically lits all the materials on the others scenes **Exact steps for others to reproduce the error** 1-open [sun_groups.blend](https://archive.blender.org/developer/F139594/sun_groups.blend) 2- Set the light group of the with plane with the Group (Group its the group of the sun light) 3-Go to the scene "Scene" and render 4- you should see the red plane, the thing its that in that "Scene" there isnt a light, its being lit by the sun on the scene "SCENE-2" 5-erase the light group from the material on the plane white on the "SCENE-2" 6-Now try to render the red plane, it should render black

Nahuel Belich commented

2015-01-27 13:52:52 +01:00

Changed status to: 'Open'

Nahuel Belich commented

2015-01-27 13:52:52 +01:00

Added subscriber: @NahuelBelich

Cezary Kopias commented

2015-01-27 14:04:32 +01:00

Added subscriber: @kopias

Cezary Kopias commented

2015-01-27 14:04:32 +01:00

confirmed, this is weird indeed:

i firstly assumed that light groups can be reused across all scene since you can set groups from other scene, but it does not work unless you link light from that group to current scene
and its on visible layer

so in this case light from other scene is litting all scenes

confirmed, this is weird indeed: i firstly assumed that light groups can be reused across all scene since you can set groups from other scene, but it does not work unless you link light from that group to current scene and its on visible layer so in this case light from other scene is litting all scenes

Nahuel Belich commented

2015-01-27 14:04:41 +01:00

ok i fell a bit dumb because its weird but it works as it use to worked on blender 2.49 just cheked, sorry

Nahuel Belich commented

2015-01-27 14:32:48 +01:00

http://wiki.blender.org/index.php/Dev:Ref/Outdated/Release_Notes/Modeling/Objects/Groups_and_Parenting#Light_Groups

""Light Groups
In the Material buttons (F5) Shading panel, you can indicate a Group of Lamp Objects to be used as light for rendering, instead of the usual visible Lamps. This actually enables per-Material lighting (independent of which Object has the Material, or whether the Lamps are in visible layer).
If you don't want Lamps from a Light Group to work on the other Objects, just move them to an invisible layer.""

if i understand right this should be named as "global lights groups", witch adds each light in the selected groups as global lights, so if i have an scene with three lights and a group fot each light i will be litting all the scenes with those three lights plus the rest

http://wiki.blender.org/index.php/Dev:Ref/Outdated/Release_Notes/Modeling/Objects/Groups_and_Parenting#Light_Groups ""Light Groups In the Material buttons (F5) Shading panel, you can indicate a Group of Lamp Objects to be used as light for rendering, instead of the usual visible Lamps. This actually enables per-Material lighting (independent of which Object has the Material, or whether the Lamps are in visible layer). If you don't want Lamps from a Light Group to work on the other Objects, just move them to an invisible layer."" if i understand right this should be named as "global lights groups", witch adds each light in the selected groups as global lights, so if i have an scene with three lights and a group fot each light i will be litting all the scenes with those three lights plus the rest

Sergey Sharybin commented

2015-01-27 14:37:10 +01:00

Changed status from 'Open' to: 'Archived'

Sergey Sharybin closed this issue

2015-01-27 14:37:10 +01:00

Sergey Sharybin self-assigned this 2015-01-27 14:37:10 +01:00

Sergey Sharybin commented

2015-01-27 14:37:10 +01:00

Light groups weren't actually intended to be used in multi-scene scenario -- there's no proper check for whether material is used or not. Improvements here are possible and would be nice to be done, but it'll be handled as a part of TODO list work: http://wiki.blender.org/index.php/Dev:2.5/Source/Development/Todo/Render#Render_Engine

Thanks for the report, but closing as a TODO now.

Light groups weren't actually intended to be used in multi-scene scenario -- there's no proper check for whether material is used or not. Improvements here are possible and would be nice to be done, but it'll be handled as a part of TODO list work: http://wiki.blender.org/index.php/Dev:2.5/Source/Development/Todo/Render#Render_Engine Thanks for the report, but closing as a TODO now.

Cezary Kopias commented

2015-01-27 14:47:51 +01:00

i would suggest to have "exclusive" to be checked by default, in most cases its what you expect and works well with multiscene setups

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Light groups lit all the materials on different scenes #43432