Hair renders with GPU but not with CPU #42562

New Issue

Ernst Hammann · 2014-11-10T17:30:20+01:00

Ernst Hammann commented

2014-11-10 17:30:20 +01:00

System Information
Operating system and graphics card

Windows 8.1 64 bit
16 GB RAM
Processor: Intel Core i7-4470
MSI NVIDIA GeForce GTX 750 Ti

Blender Version
2.72b

Short description of error
Sometimes hair renders with GPU but not with CPU

Might be related to https://developer.blender.org/T41066
but not sure

see also http://blenderartists.org/forum/showthread.php?353958-Is-this-a-bug-Hair-not-rendered-with-CPU-but-with-GPU&p=2760759#post2760759

Exact steps for others to reproduce the error
hair_bug.blend
Unfortunalety, this is not a simple issue. When I open a new (blank) file and create hair on a random object (like a UV sphere) there is no problem.
But I have an older file which I first created in Blender 2.71 where hair doesn't render with CPU render, only with GPU render. BUT: I tried this file on a different computer without GPU, and on this one the hair is rendered with CPU render totally correct.
So it's maybe not really a bug in Blender but rather a bug in the file. I also noticed that a new file with a UV sphere and hair has a size of 144 KB whereas my old file where I removed everything (at least everything I could find) has a size of 972 KB (with nothing but a UV sphere and hair in it).

I don't know what to make out of all this but at least I wanted to report it.

Thank you,

Ernst Hammann

**System Information** Operating system and graphics card Windows 8.1 64 bit 16 GB RAM Processor: Intel Core i7-4470 MSI NVIDIA GeForce GTX 750 Ti **Blender Version** 2.72b **Short description of error** Sometimes hair renders with GPU but not with CPU Might be related to https://developer.blender.org/T41066 but not sure see also http://blenderartists.org/forum/showthread.php?353958-Is-this-a-bug-Hair-not-rendered-with-CPU-but-with-GPU&p=2760759#post2760759 **Exact steps for others to reproduce the error** [hair_bug.blend](https://archive.blender.org/developer/F123120/hair_bug.blend) Unfortunalety, this is not a simple issue. When I open a new (blank) file and create hair on a random object (like a UV sphere) there is no problem. But I have an older file which I first created in Blender 2.71 where hair doesn't render with CPU render, only with GPU render. BUT: I tried this file on a different computer without GPU, and on this one the hair is rendered with CPU render totally correct. So it's maybe not really a bug in Blender but rather a bug in the file. I also noticed that a new file with a UV sphere and hair has a size of 144 KB whereas my old file where I removed everything (at least everything I could find) has a size of 972 KB (with nothing but a UV sphere and hair in it). I don't know what to make out of all this but at least I wanted to report it. Thank you, Ernst Hammann

Ernst Hammann commented

2014-11-10 17:30:20 +01:00

Changed status to: 'Open'

Ernst Hammann self-assigned this 2014-11-10 17:30:20 +01:00

Ernst Hammann commented

2014-11-10 17:30:20 +01:00

Added subscriber: @JASMS