Blender Foundation: Blender 2.x BF release: Detail: 31987 Rendering issue with using sample as lamp in world settings

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[#31987] Rendering issue with using sample as lamp in world settings

Date:
2012-07-02 13:08 Priority:
3

State:
Closed

Submitted by:
Roy Gore (ragbuster) Assigned to:
Brecht Van Lommel (blendix)

Category:
Rendering: Cycles Status:
Fixed / Closed

Relates to: Duplicates:

Patches:

Summary:
Rendering issue with using sample as lamp in world settings

Detailed description

I have discovered an issue which only occurs when using multi gpu rendering selected when using the sample as lamp option in the world settings using a background environment map. If only one video card is selected to use for the rendering device everything works fine.

I have included a simple blend file which on my system works if using 128 samples but if I increase them to 256 the sphere is reflecting just black. (renders fine with much higher values when using 1 gpu)

To reproduce the problem just increase the samples on the sample as lamp.

I am using 2 x GTX 570 1280Mb
I have tried 32bit and 64bit Windows 7 both have the same result.

Followup

Message

Date: 2012-07-03 13:53
Sender: Sergey Sharybin
Brecht, could you please check on this?

Date: 2012-08-07 19:21
Sender: Roy Gore
Get the same result with 2 x gtx 570 2.5GB cards as well.

Date: 2012-09-19 10:55
Sender: Thomas Dinges
Can you please re-test with RC1? http://download.blender.org/release/Blender2.64/

Date: 2012-09-20 09:09
Sender: Roy Gore
Still the same issue. Strangely if I reduce the value to 255 it sometimes renders correctly, and sometimes renders properly when returning it back to 256. Is it some sort of sync issue when using multi gpu?

Date: 2012-10-01 20:32
Sender: Brecht Van Lommel
Fix in svn, thanks for the report.

Attached Files:

Name	Date	Download

sampleaslamp_multigpu.blend	2012-07-02 13:08	Download

Changes:

Field	Old Value	Date	By

status_id	Open	2012-10-01 20:32	blendix
close_date	None	2012-10-01 20:32	blendix
Status	New	2012-10-01 20:32	blendix
assigned_to	none	2012-07-03 13:53	nazgul
File Added	21312: sampleaslamp_multigpu.blend	2012-07-02 13:08	ragbuster