Cycles doesn't update viewport rendering when Is Shadow Ray is used as a mix factor the first time #46045

New Issue

Matt Heimlich · 2015-09-07T20:41:05+02:00

Matt Heimlich commented

2015-09-07 20:41:05 +02:00

System Information
Win 7 x64

Blender Version
Broken in master as of Sept 9 2015

Short description of error
When adding a material in your scene that uses the Is Shadow Ray light path as a mix factor, viewport rendering doesn't update correctly. Stopping and restarting rendering causes it to update correctly, and it updates correctly in all cases after the original error.

Exact steps for others to reproduce the error
Doesn't seem to work with a saved/loaded file, sorry.

My steps to recreate are: create a new file, create a sphere on top of a plane, add sun lamp, start preview rendering, add material to sphere with diffuse and transparent mixed via Is Shadow Ray.

Image one shows result after above steps, image two shows the result after hitting shift + z twice

{F231257}

**System Information** Win 7 x64 **Blender Version** Broken in master as of Sept 9 2015 **Short description of error** When adding a material in your scene that uses the Is Shadow Ray light path as a mix factor, viewport rendering doesn't update correctly. Stopping and restarting rendering causes it to update correctly, and it updates correctly in all cases after the original error. **Exact steps for others to reproduce the error** Doesn't seem to work with a saved/loaded file, sorry. My steps to recreate are: create a new file, create a sphere on top of a plane, add sun lamp, start preview rendering, add material to sphere with diffuse and transparent mixed via Is Shadow Ray. Image one shows result after above steps, image two shows the result after hitting shift + z twice {[F231257](https://archive.blender.org/developer/F231257/cycleserror1.PNG)}![cycleserror2.PNG](https://archive.blender.org/developer/F231259/cycleserror2.PNG)

Matt Heimlich commented

2015-09-07 20:41:05 +02:00

Changed status to: 'Open'

Sergey Sharybin was assigned by Matt Heimlich

2015-09-07 20:41:05 +02:00

Matt Heimlich commented

2015-09-07 20:41:05 +02:00

Added subscriber: @MatthewHeimlich

Thomas Dinges commented

2015-09-07 22:34:01 +02:00

Added subscriber: @ThomasDinges

Thomas Dinges commented

2015-09-07 22:35:46 +02:00

I assume this is another case of the integrator not updating, after inserting the transparent shader. See optimization in Integrator::device_update() for transparent shadows.

blender-admin commented

2015-09-08 08:28:02 +02:00

This issue was referenced by 0e12228bd9

This issue was referenced by 0e12228bd9976d58068879c80e7bb2bfde22b4f7

Sergey Sharybin commented

2015-09-08 08:29:14 +02:00

Changed status from 'Open' to: 'Resolved'

Sergey Sharybin closed this issue

2015-09-08 08:29:14 +02:00

blender-admin commented

2015-09-08 10:10:55 +02:00

This issue was referenced by blender/cycles@5942b4e442

This issue was referenced by blender/cycles@5942b4e442d511921a92fd898989bd594f8858cb

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Cycles doesn't update viewport rendering when Is Shadow Ray is used as a mix factor the first time #46045