Transparent shader leave some traces when objects are overlapping #42624

New Issue

Thomas Dinges · 2014-11-17T11:32:50+01:00

gviger commented

2014-11-17 11:32:50 +01:00

(Migrated from localhost:3001)

System Information
Windows 8 and graphics card gforce 740m

Blender Version
Broken: 2.72b 9e963ae

Transparent shader leave some traces when objects are overlapping

Exact steps for others to reproduce the error

Use default blend with cube
Add plane with 5 radius
Move cube in z by 1
Use cycles render
Set cube material to Transparent BSDF with white color R: 1, G: 1, B: 1
Render

transparent-bsdf.blend
Based on a (as simple as possible) attached .blend file with minimum amount of steps

Also noticed problem with showing shadow on initial setup of Transparent BSDF with white color, even when check box 'Transparent Shadows' is checked/unchecked, but could not reproduce now.

**System Information** Windows 8 and graphics card gforce 740m **Blender Version** Broken: 2.72b 9e963ae **Transparent shader leave some traces when objects are overlapping** **Exact steps for others to reproduce the error** 1. Use default blend with cube 2. Add plane with 5 radius 3. Move cube in z by 1 4. Use cycles render 5. Set cube material to Transparent BSDF with white color R: 1, G: 1, B: 1 6. Render [transparent-bsdf.blend](https://archive.blender.org/developer/F124425/transparent-bsdf.blend) Based on a (as simple as possible) attached .blend file with minimum amount of steps Also noticed problem with showing shadow on initial setup of Transparent BSDF with white color, even when check box 'Transparent Shadows' is checked/unchecked, but could not reproduce now.

gviger commented

2014-11-17 11:32:50 +01:00

(Migrated from localhost:3001)

Changed status to: 'Open'

gviger commented

2014-11-17 11:32:50 +01:00

(Migrated from localhost:3001)

Added subscriber: @gviger

Thomas Dinges commented

2014-11-17 11:40:33 +01:00

Added subscribers: @Sergey, @ThomasDinges

Thomas Dinges commented

2014-11-17 11:40:33 +01:00

@Sergey: Do we consider this a bug?

Ray Mairlot commented

2014-11-17 12:33:16 +01:00

Added subscriber: @RayMairlot

Ruel Borais commented

2014-11-17 14:52:24 +01:00

Added subscriber: @ruelnet

Sergey Sharybin commented

2014-11-25 15:17:16 +01:00

Changed status from 'Open' to: 'Archived'

Sergey Sharybin closed this issue

2014-11-25 15:17:16 +01:00

Sergey Sharybin self-assigned this 2014-11-25 15:17:16 +01:00

Sergey Sharybin commented

2014-11-25 15:17:16 +01:00

Wouldn't consider it a bug, it's just the way how ray bounces happens currently -- when surface is hit ray is having a bit of an offset for the bounce so it doesn't intersect the same surface twice. If you've got two intersecting planes which lies on the same plane it will give issues in one way or another.

Thanks for the report, but it's quite tricky to solve without introducing slowdown. You might just offset the cube by 0.0001 units and it'll be all fine.

Wouldn't consider it a bug, it's just the way how ray bounces happens currently -- when surface is hit ray is having a bit of an offset for the bounce so it doesn't intersect the same surface twice. If you've got two intersecting planes which lies on the same plane it will give issues in one way or another. Thanks for the report, but it's quite tricky to solve without introducing slowdown. You might just offset the cube by 0.0001 units and it'll be all fine.

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Transparent shader leave some traces when objects are overlapping #42624