Cycles: Turning Off Ray Visibility Breaks Occlusion from Environment #43117

New Issue

Zauber Paracelsus · 2015-01-04T01:31:12+01:00

Zauber Paracelsus commented

2015-01-04 01:31:12 +01:00

System Information
64bit Ubuntu 14.04, kernel 3.13.0
GeForce GTX 650 Ti, driver version 331
Operating system and graphics card

Blender Version
Broken: 2.73, build c24b694

Short description of error
When you unset the Ray Visibility flags for an object, that object will cease to occlude the environment. The result is that if you have a box and turn off Ray Visibility for Diffuse, then any light from the environment will pass into the object's interior, as though it were not there.

Tested only with CPU and OSL rendering. Unable to test with GPU rendering, as for some reason CUDA no longer detects my GPU.

Exact steps for others to reproduce the error

Download and open the following file:
Set viewport mode to Rendered.
Go to the panel on the lower right, under Ray Visibility.
Unset the Diffuse flag, and note that the sphere turns red, and the surroundings turn bright gray.
Set the Diffuse flag back, and then unset the Glossy flag. Note that the sphere turns blue.

**System Information** 64bit Ubuntu 14.04, kernel 3.13.0 GeForce GTX 650 Ti, driver version 331 Operating system and graphics card **Blender Version** Broken: 2.73, build c24b694 **Short description of error** When you unset the Ray Visibility flags for an object, that object will cease to occlude the environment. The result is that if you have a box and turn off Ray Visibility for Diffuse, then any light from the environment will pass into the object's interior, as though it were not there. Tested only with CPU and OSL rendering. Unable to test with GPU rendering, as for some reason CUDA no longer detects my GPU. **Exact steps for others to reproduce the error** 1) Download and open the following file: 2) Set viewport mode to Rendered. 2) Go to the panel on the lower right, under Ray Visibility. 3) Unset the Diffuse flag, and note that the sphere turns red, and the surroundings turn bright gray. 4) Set the Diffuse flag back, and then unset the Glossy flag. Note that the sphere turns blue.

Zauber Paracelsus commented

2015-01-04 01:31:12 +01:00

Changed status to: 'Open'

Zauber Paracelsus commented

2015-01-04 01:31:12 +01:00

Added subscriber: @ZauberParacelsus

Aaron Carlisle commented

2015-01-04 01:32:52 +01:00

Added subscriber: @Blendify

Aaron Carlisle commented

2015-01-04 01:32:52 +01:00

Please post a .blend

Zauber Paracelsus commented

2015-01-04 01:33:36 +01:00

Sorry, I accidentally deleted the link, fixing...

Zauber Paracelsus commented

2015-01-04 01:34:31 +01:00

Posting the blend in this comment, since I can't go back and edit the original post.

EnvironmentOcclusionBug.blend

Posting the blend in this comment, since I can't go back and edit the original post. [EnvironmentOcclusionBug.blend](https://archive.blender.org/developer/F135030/EnvironmentOcclusionBug.blend)

Sergey Sharybin commented

2015-01-06 13:53:44 +01:00

Added subscriber: @Sergey

Sergey Sharybin commented

2015-01-06 13:53:44 +01:00

I'm not really sure what's the error in here? Disabled diffuse visibility makes it so diffuse component of the sphere becomes visible (because for that one lighting is no longer blocked by the box. Disabled glossy visibility means glossy component of sphere receives light.

Also, without glossy sphere is rather gray here than blue..

I'm not really sure what's the error in here? Disabled diffuse visibility makes it so diffuse component of the sphere becomes visible (because for that one lighting is no longer blocked by the box. Disabled glossy visibility means glossy component of sphere receives light. Also, without glossy sphere is rather gray here than blue..

Zauber Paracelsus commented

2015-01-06 14:05:55 +01:00

You will note that in the scene there is a sun lamp. It has no influence upon the sphere unless you turn off Shadow visibility for the box.

That inconsistency is the problem. Environment Lighting should continue to be blocked just like any other light source when the box's diffuse visibility is turned off.

You will note that in the scene there is a sun lamp. It has no influence upon the sphere unless you turn off Shadow visibility for the box. That inconsistency is the problem. Environment Lighting should continue to be blocked just like any other light source when the box's diffuse visibility is turned off.

Sergey Sharybin commented

2015-01-07 10:58:16 +01:00

You can't really expect environment light to be the same as other light sources actually simply because of their shadow behavior. It would be weird to make it so environment light is affected by the shadow visibility because environment doesn't give shadows apart from AO shadows (which you can't currently control). And because "regular" light sources casts shadows and shadow rays are blocked sphere is not highlighted by the sun.

For me it doesn't seem to be inconsistency not having logic here.

You can't really expect environment light to be the same as other light sources actually simply because of their shadow behavior. It would be weird to make it so environment light is affected by the shadow visibility because environment doesn't give shadows apart from AO shadows (which you can't currently control). And because "regular" light sources casts shadows and shadow rays are blocked sphere is not highlighted by the sun. For me it doesn't seem to be inconsistency not having logic here.

Sergey Sharybin commented

2015-01-07 17:01:02 +01:00

Changed status from 'Open' to: 'Archived'

Sergey Sharybin closed this issue

2015-01-07 17:01:02 +01:00

Sergey Sharybin self-assigned this 2015-01-07 17:01:02 +01:00

Sergey Sharybin commented

2015-01-07 17:01:02 +01:00

Talked to some artists, and they also finds current behavior quite clear. Changing flags would break loads of scenes, so it should be much bigger outcome than subjective consistency feeling.

If it's really a stopper for your pipeline, then please be welcome to bf-cycles mailing list (http://lists.blender.org/mailman/listinfo/bf-cycles) so discussion raises with all the Cycles users.

In any case, don't consider this a bug, but thanks for the report anyway.

Talked to some artists, and they also finds current behavior quite clear. Changing flags would break loads of scenes, so it should be much bigger outcome than subjective consistency feeling. If it's really a stopper for your pipeline, then please be welcome to bf-cycles mailing list (http://lists.blender.org/mailman/listinfo/bf-cycles) so discussion raises with all the Cycles users. In any case, don't consider this a bug, but thanks for the report anyway.

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Cycles: Turning Off Ray Visibility Breaks Occlusion from Environment #43117