osl in Cycles Branched Path Tracing bug #46053

New Issue

jianzwan · 2015-09-09T05:39:11+02:00

jianzwan commented

2015-09-09 05:39:11 +02:00

System Information
windows8 surface pro3
cpu: i3
GPU: Intel(R) HD Graphics Family ??

Blender Version
2.75a c27589e

osl in Cycles Branched Path Tracing bug
in Path Tracing is perfect
Test.osl

shader test(
    point Point = P,
    output color out = 0.5)
{
    out = color(Point);
}

no volume Absorption

**System Information** windows8 surface pro3 cpu: i3 GPU: Intel(R) HD Graphics Family ?? **Blender Version** 2.75a c27589e osl in Cycles Branched Path Tracing bug in Path Tracing is perfect Test.osl ``` shader test( point Point = P, output color out = 0.5) { out = color(Point); } ``` ![123.jpg](https://archive.blender.org/developer/F231626/123.jpg) no volume Absorption ![333.jpg](https://archive.blender.org/developer/F231629/333.jpg)

jianzwan commented

2015-09-09 05:39:11 +02:00

Changed status to: 'Open'

jianzwan commented

2015-09-09 05:39:11 +02:00

Added subscriber: @An_Zi

Sergey Sharybin commented

2015-09-09 11:33:49 +02:00

Added subscriber: @Sergey

Sergey Sharybin commented

2015-09-09 11:33:49 +02:00

Changed status from 'Open' to: 'Archived'

Sergey Sharybin closed this issue

2015-09-09 11:33:49 +02:00

Sergey Sharybin self-assigned this 2015-09-09 11:33:49 +02:00

Sergey Sharybin commented

2015-09-09 11:33:49 +02:00

Your setup allows negative colors to occur, which isn't really a good idea and confuses integrators a lot. Such setups might or might now work, depending on particular integrator.

In the interface we're limiting colors to be always positive, but on runtime and especially with scripts it's up to you to make sure you don't produce situations which can't be rendered in a deterministic way.

In this particular case you can simply clamp negative values of point.

So thanks for the report, but archiving it now.

Your setup allows negative colors to occur, which isn't really a good idea and confuses integrators a lot. Such setups might or might now work, depending on particular integrator. In the interface we're limiting colors to be always positive, but on runtime and especially with scripts it's up to you to make sure you don't produce situations which can't be rendered in a deterministic way. In this particular case you can simply clamp negative values of point. So thanks for the report, but archiving it now.

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osl in Cycles Branched Path Tracing bug #46053