Microdisplacement in cycles works with only one value in a particle system despite of passing different values per particle #51226

New Issue

iszotic · 2017-04-15T23:58:57+02:00

iszotic commented

2017-04-15 23:58:57 +02:00

System Information
Linux 4.4.0-72-generic - x86_64
Xubuntu 16.04
NVIDIA Driver Version 370.28

Blender Version
Broken: 2.78c

Short description of error
Microdisplacement in cycles works with only one value in a particle system despite of passing different values per particle

Exact steps for others to reproduce the error

set expermiental in feature set
subdivision initial cube
add plane with a particle system setted to hair, then in the render tab set object and use the initial cube.
create a material for the initial cube, set an emission node to the surface output, then add a multiply node to the displacement node, add a object info node and connect random to multiply and to the emission node, then set the unused input of the multiply node to 20.0 or 10.0
set displacement to "both" in the settings tab
render. All "spheres" particles now have the same size because the micro displacement is the same in all particles. It should show spheres with different size. The random values passed to the emission shader shows that the object info node random output is working.

Microdisplacement-Particles.blend

**System Information** Linux 4.4.0-72-generic - x86_64 Xubuntu 16.04 NVIDIA Driver Version 370.28 **Blender Version** Broken: 2.78c **Short description of error** Microdisplacement in cycles works with only one value in a particle system despite of passing different values per particle **Exact steps for others to reproduce the error** 1) set expermiental in feature set 2) subdivision initial cube 3) add plane with a particle system setted to hair, then in the render tab set object and use the initial cube. 4) create a material for the initial cube, set an emission node to the surface output, then add a multiply node to the displacement node, add a object info node and connect random to multiply and to the emission node, then set the unused input of the multiply node to 20.0 or 10.0 5) set displacement to "both" in the settings tab 6) render. All "spheres" particles now have the same size because the micro displacement is the same in all particles. It should show spheres with different size. The random values passed to the emission shader shows that the object info node random output is working. [Microdisplacement-Particles.blend](https://archive.blender.org/developer/F546559/Microdisplacement-Particles.blend)

iszotic commented

2017-04-15 23:58:57 +02:00

Changed status to: 'Open'

iszotic commented

2017-04-15 23:58:57 +02:00

Added subscriber: @iszotic

Mai Lavelle was assigned by Aaron Carlisle

2017-04-16 06:10:53 +02:00

Brecht Van Lommel commented

2017-04-16 19:45:33 +02:00

Added subscriber: @brecht

Brecht Van Lommel commented

2017-04-16 19:45:33 +02:00

Changed status from 'Open' to: 'Archived'

Brecht Van Lommel closed this issue

2017-04-16 19:45:33 +02:00

Brecht Van Lommel commented

2017-04-16 19:45:33 +02:00

Thanks for the report, but this is just a missing feature at this point, one of the reasons this feature is still marked as experimental.

To save memory and render time it's important that instancing works by sharing the same mesh for all. However there are cases where it is useful to not use instancing, and we could eventually add an option for that or try to detect it automatically based on the nodes used in the shader network.

Thanks for the report, but this is just a missing feature at this point, one of the reasons this feature is still marked as experimental. To save memory and render time it's important that instancing works by sharing the same mesh for all. However there are cases where it is useful to not use instancing, and we could eventually add an option for that or try to detect it automatically based on the nodes used in the shader network.

Ethan commented

2019-05-15 04:26:47 +02:00

Added subscriber: @ETFO

Ethan commented

2019-05-15 04:26:47 +02:00

Hey, are there any updates on this being added as a feature?

Sign in to join this conversation.

No Label

Download

What's New

Blender Studio

Manual

Developers Blog

Documentation

Benchmark

Blender Conference

Development Fund

One-time Donations

Microdisplacement in cycles works with only one value in a particle system despite of passing different values per particle #51226