Particles set as objects cast wrong ray shadows in BI #48799

New Issue

Alex · 2016-07-06T19:18:12+02:00

Alex commented

2016-07-06 19:18:12 +02:00

System Information
Intel Core i7, 8 Gb RAM, AMD Radeon HD 7700
Windows 7 x64

Blender Version
Broken: 2.77 950c2ea
Worked: 2.77a abf6f08

Short description of error
Particles set as objects cast ray shadows with artifacts in BI.

Exact steps for others to reproduce the error

Open Blender, add a simple plane and add a particle system to it.
Set start and end frames to 1 so all particles will spawn right away and number of particles to 10 or other small number.
Set particle Render to Object and add a default Cube as an object, set its Size big enough so cubes will cast visible shadows.
Set any lamp that can create Ray Shadows and rotate it to make cubes cast shadow.
Render your scene.

In 2.77a ray shadows will work as expected.
In latest build shadows will be at the wrong places and there will be many lighting artifacts.

Just in case: here is how it looks in 2.77a and latest 2.77. You can use my test file - just open it and hit render.

Particle_object_artifacts.blend

**System Information** Intel Core i7, 8 Gb RAM, AMD Radeon HD 7700 Windows 7 x64 **Blender Version** Broken: 2.77 950c2ea Worked: 2.77a abf6f08 **Short description of error** Particles set as objects cast ray shadows with artifacts in BI. **Exact steps for others to reproduce the error** 1. Open Blender, add a simple plane and add a particle system to it. 2. Set start and end frames to 1 so all particles will spawn right away and number of particles to 10 or other small number. 3. Set particle Render to Object and add a default Cube as an object, set its Size big enough so cubes will cast visible shadows. 4. Set any lamp that can create Ray Shadows and rotate it to make cubes cast shadow. 5. Render your scene. - In 2.77a ray shadows will work as expected. - In latest build shadows will be at the wrong places and there will be many lighting artifacts. Just in case: here is how it looks in 2.77a and latest 2.77. You can use my test file - just open it and hit render.![shadow_bug_1.png](https://archive.blender.org/developer/F319857/shadow_bug_1.png) [Particle_object_artifacts.blend](https://archive.blender.org/developer/F319859/Particle_object_artifacts.blend)

Alex commented

2016-07-06 19:18:12 +02:00

Changed status to: 'Open'

Alex commented

2016-07-06 19:18:12 +02:00

Added subscriber: @SpectreFirst

Alex commented

2016-07-06 22:12:26 +02:00

I have made some additional tests to find a temporary workaround and found out some other issues:

Shadows change if you uncheck "Instances" option under the "Acceleration structure" in Properties -> Render -> Performance
Shadows change if you rotate an object that is used for duplication (which is a Cube in my example file)
Shadows change if you set "Acceleration structure" to Octree

I have also found a very strange phenomenon: billboards with transparent texture are rendering with shadows turned upside-down! Changing acceleration structures doesn't seem to affect it and same thing happens when I use objects with transparent textures so this becomes a real problem for me. I also don't know if this is a separate issue or not. Here is an example: Particle_object_artifacts1.blend

I have made some additional tests to find a temporary workaround and found out some other issues: - Shadows change if you uncheck "Instances" option under the "Acceleration structure" in Properties -> Render -> Performance - Shadows change if you rotate an object that is used for duplication (which is a Cube in my example file) - Shadows change if you set "Acceleration structure" to Octree I have also found a very strange phenomenon: billboards with transparent texture are rendering with shadows turned upside-down! Changing acceleration structures doesn't seem to affect it and same thing happens when I use objects with transparent textures so this becomes a real problem for me. I also don't know if this is a separate issue or not. Here is an example:![Upsidedown_shadows.png](https://archive.blender.org/developer/F319873/Upsidedown_shadows.png) [Particle_object_artifacts1.blend](https://archive.blender.org/developer/F319875/Particle_object_artifacts1.blend)

Sergey Sharybin commented

2016-07-08 18:10:18 +02:00

Changed status from 'Open' to: 'Resolved'

Sergey Sharybin closed this issue

2016-07-08 18:10:18 +02:00

blender-admin commented

2016-07-08 18:10:29 +02:00

This issue was referenced by 3b7bce42d7

This issue was referenced by 3b7bce42d7096d840c4cbdb6c4b98310cfe551ef

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Particles set as objects cast wrong ray shadows in BI #48799