No volume scattering shadows for semi-transparent objects if multisampled scene motion blur is on #48346

New Issue

Daniele De Luca · 2016-05-03T16:28:52+02:00

Daniele De Luca commented

2016-05-03 16:28:52 +02:00

System Information
Linux x64 - Quadro 4000

Blender Version
Broken: 2.77, 2.77a

Short description of error
The scattering of the shadow inside a volume object doesn't work for semi-transparent (e.g diffuse mixed with transparent) objects if the scene motion blur is activated

Exact steps for others to reproduce the error
Create a powerful spot lamp (strength 5000)
Create a big cube, assign a volume scatter material with semi low density (0.01-0.1)
Create a small cube inside the volumetric cube, assign a semi transparent material to the object
Animate the small cube (rot)
Activate motion blur

Render to see that there isn't any scattered shadows of the semi transparent object when it is moving

bug motion blur.blend

**System Information** Linux x64 - Quadro 4000 **Blender Version** Broken: 2.77, 2.77a **Short description of error** The scattering of the shadow inside a volume object doesn't work for semi-transparent (e.g diffuse mixed with transparent) objects if the scene motion blur is activated **Exact steps for others to reproduce the error** Create a powerful spot lamp (strength 5000) Create a big cube, assign a volume scatter material with semi low density (0.01-0.1) Create a small cube inside the volumetric cube, assign a semi transparent material to the object Animate the small cube (rot) Activate motion blur Render to see that there isn't any scattered shadows of the semi transparent object when it is moving [bug motion blur.blend](https://archive.blender.org/developer/F308894/bug_motion_blur.blend)

Daniele De Luca commented

2016-05-03 16:28:52 +02:00

Changed status to: 'Open'

Daniele De Luca commented

2016-05-03 16:28:52 +02:00

Added subscriber: @Sparazza

Sergey Sharybin commented

2016-05-03 16:53:32 +02:00

Added subscriber: @Sergey

Sergey Sharybin commented

2016-05-03 16:53:32 +02:00

I don't see the issue by comparing results of render with and without motion blur. After enabling motion blur shadow is becoming more fuzzy, exactly what you would expect.

So what makes you to believe there's a bug here?

I don't see the issue by comparing results of render with and without motion blur. After enabling motion blur shadow is becoming more fuzzy, exactly what you would expect. So what makes you to believe there's a bug here?

Daniele De Luca commented

2016-05-03 18:05:09 +02:00

Rendering with two material configuration of the attached blend I see the behaviour in the image
in the viewport, with no motion blur, all seem to be right

What else could I provide to investigate more?

Rendering with two material configuration of the attached blend I see the behaviour in the image in the viewport, with no motion blur, all seem to be right What else could I provide to investigate more?![Screenshot from 2016-05-03 18:00:57.jpg](https://archive.blender.org/developer/F308904/Screenshot_from_2016-05-03_18_00_57.jpg)

Sergey Sharybin self-assigned this 2016-05-03 18:12:07 +02:00

Sergey Sharybin commented

2016-05-03 18:12:07 +02:00

Ok so, in order to reproduce the bug the material is to be switched to the nodes which are in the "NO" frame.

Will have a look into the issue.

Ok so, in order to reproduce the bug the material is to be switched to the nodes which are in the "NO" frame. Will have a look into the issue.

blender-admin commented

2016-05-04 14:46:30 +02:00

This issue was referenced by 980f3c3693

This issue was referenced by 980f3c36937a5b7b0a967b4c68c43168ccc583b9

Sergey Sharybin commented

2016-05-04 14:47:02 +02:00

Changed status from 'Open' to: 'Resolved'

Sergey Sharybin closed this issue

2016-05-04 14:47:02 +02:00

blender-admin commented

2016-05-08 14:54:11 +02:00

This issue was referenced by blender/cycles@c5993b1782

This issue was referenced by blender/cycles@c5993b178296ca6ebd9085b8521cc17fa7f1fb0e

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No volume scattering shadows for semi-transparent objects if multisampled scene motion blur is on #48346