Point density and voxel data don't work as particle textures #44901

New Issue

Tye Bishop · 2015-05-31T00:50:26+02:00

Tye Bishop commented

2015-05-31 00:50:26 +02:00

System Information
OS: Windows 7
CPU: FX-8350
GPU: R9 280x

Blender Version
Broken: 2.74

Short description of error
When a point density or voxel data texture is used as a particle texture, the entire texture is effectively position 0 on the colour ramp, even when patterns are shown when the texture is used as a material texture.

Exact steps for others to reproduce the error
Create something such as a point density texture for particle system A, and use it to control "Density" of particle system B.
Particle system B fails to generate particles around those from system A with the default colour ramp. If the colour ramp is flipped, then Particle system B will generate particles everywhere, as it reads only position 0 on the colour ramp.

**System Information** OS: Windows 7 CPU: FX-8350 GPU: R9 280x **Blender Version** Broken: 2.74 **Short description of error** When a point density or voxel data texture is used as a particle texture, the entire texture is effectively position 0 on the colour ramp, even when patterns are shown when the texture is used as a material texture. **Exact steps for others to reproduce the error** Create something such as a point density texture for particle system A, and use it to control "Density" of particle system B. Particle system B fails to generate particles around those from system A with the default colour ramp. If the colour ramp is flipped, then Particle system B will generate particles everywhere, as it reads only position 0 on the colour ramp.

Tye Bishop commented

2015-05-31 00:50:26 +02:00

Changed status to: 'Open'

Tye Bishop commented

2015-05-31 00:50:26 +02:00

Added subscriber: @accursedCursive

Tye Bishop commented

2015-05-31 00:58:31 +02:00

Oops, I might have been wrong in adding this to "project: Addons".
Only noticed that as I pressed the submit button.

Oops, I might have been wrong in adding this to "project: Addons". Only noticed that as I pressed the submit button.

Aaron Carlisle self-assigned this 2015-05-31 01:57:51 +02:00

Aaron Carlisle removed their assignment 2015-05-31 01:59:11 +02:00

Aaron Carlisle commented

2015-05-31 01:59:11 +02:00

Added subscriber: @Blendify

Aaron Carlisle commented

2015-05-31 01:59:53 +02:00

Please post a simple .blend demonstrating the issue

Tye Bishop commented

2015-05-31 03:03:59 +02:00

untitled.blend
In this file, the particles dropped from the plane are supposed to control the particle emission of the cube.
I've got the point density texture that should be doing this as a control for rendered volumetric density as well, so you can render to see the texture that the particles dropped from the plane create.

[untitled.blend](https://archive.blender.org/developer/F182222/untitled.blend) In this file, the particles dropped from the plane are supposed to control the particle emission of the cube. I've got the point density texture that should be doing this as a control for rendered volumetric density as well, so you can render to see the texture that the particles dropped from the plane create.

Brecht Van Lommel commented

2015-05-31 13:34:44 +02:00

Added subscriber: @brecht

Brecht Van Lommel commented

2015-05-31 13:34:44 +02:00

These textures only work in the renderer, their (quite slow) preprocessing code is only executed as part of render initialization. Probably this would be considered a missing feature more than a bug.

Sergey Sharybin commented

2015-06-02 09:49:44 +02:00

Added subscriber: @Sergey

Sergey Sharybin commented

2015-06-02 09:49:44 +02:00

Changed status from 'Open' to: 'Archived'

Sergey Sharybin closed this issue

2015-06-02 09:49:44 +02:00

Sergey Sharybin self-assigned this 2015-06-02 09:49:44 +02:00

Sergey Sharybin commented

2015-06-02 09:49:44 +02:00

Wouldn't consider this a bug, point density is simply not hooked up to the particles texture sampling. Doing this will likely make particles even slower and use quite huge amount of memory at sampling state.

I made sure the report is linked from http://wiki.blender.org/index.php/Dev:2.5/Source/Development/Todo/Tools#Particles and closing it as a TODO now. Thanks for the report anyway!

Wouldn't consider this a bug, point density is simply not hooked up to the particles texture sampling. Doing this will likely make particles even slower and use quite huge amount of memory at sampling state. I made sure the report is linked from http://wiki.blender.org/index.php/Dev:2.5/Source/Development/Todo/Tools#Particles and closing it as a TODO now. Thanks for the report anyway!

Tye Bishop commented

2015-06-05 02:28:09 +02:00

You might want to note that voxel data textures can't control particles either, though something to solve the issue for point density textures would probably also solve it for voxel data.

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Point density and voxel data don't work as particle textures #44901