Cycles Render failure

Support Lighting and Rendering
1

Hi

I’m trying to render a low res turntable animation of this reel to reel tape recorder.

recorder_a_small.jpg960×540 95.3 KB

My machine is a AMD Phenom II x6, 16 gig of ram, Nvidia gtx 560 ti with 2 gb of vram.
I’ve tried it on Win 7 and Ubuntu 12.04 (both 64 bit). Using Blender 2.67.

It renders ok on the CPU but its slow :slight_smile:

It renders ok in a cycles viewport

GPU render fails with motion blur. I just get a black render.

GPU render fails no motion blur = sucess

When I load the scene I get this error message

Cycles shader graph connect: can only connect closure to closure (ShaderNode:subsurface_scattering, ShaderOutput:BSDF , type:7 -> to ShaderNode:rgb_ramp, ShaderInput:Fac, type:1).

Q - How can I find this problem node? I dont think I’m using a SSS node?

Another time I noticed this error message

CUDA error: Out of memory in cuMemAlloc(&device_pointer, size)
CUDA error: Invalid value in cuTexRefSetAddress(NULL, texref, cuda_device_ptr(mem.device_pointer), size)

but I had checked vram usage and it reported less than 1 gb

Here’s the link to the problem animation
https://www.box.com/s/dba2njjqsa8sr10qn7pp

thanks in advance for your help

2

Ok after a little more investigation

The vram usage goes up to around 1800 mb

I can render motion blur in the scene if I FIRSTLY render the scene without motion blur

any ideas what’s going wrong?

cheers

3

Im going to guess you are running out of ram… motion blur usually takes up more ram space due to having to store transformation matricies on moving objects…

Had a quick look at your scene, and you are very liberal with your subsurface modifiers… this is probably why your simple scene is chewing up so much ram, optimize your modifiers and you will be fine.

4

opps sorry for the late reply - but yes reducing the subdivisions cured the problem

must resist buying a 4gig nvidia card :slight_smile: