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Re: Learning the Fabric shader

Posted: Thu Jan 24, 2019 6:18 pm
by B.Y.O.B.
It sounds like the scene uses too much memory and the system is forced to swap, grinding everything to a halt.
Try to close all other programs and keep an eye on the RAM usage when you start a render.

Re: Learning the Fabric shader

Posted: Thu Jan 24, 2019 6:32 pm
by Racleborg
@BYOB

Does 12gb ram sound like enough to be able to cover an entire sofa in a fur type fabric?

(I don't know how mainy hairs I would actually need as failure kicks in too soon.)

Thanks

Re: Learning the Fabric shader

Posted: Thu Jan 24, 2019 6:53 pm
by B.Y.O.B.
You mean 12 GB total or 12 GB free RAM?
You can see some calculations and numbers about hair memory usage here:
viewtopic.php?f=4&t=591&p=6136#p6096
and here
viewtopic.php?f=4&t=591&start=10#p5935

Re: Learning the Fabric shader

Posted: Thu Jan 24, 2019 7:11 pm
by Racleborg
@BYOB

Thanks for the links which I've just been reading. ☺

Re: Learning the Fabric shader

Posted: Thu Jan 24, 2019 7:28 pm
by B.Y.O.B.
By the way, it might save a lot of memory if you join a patch with a few thousand hairs into one object and use a particle system to instance it over the furniture.

Re: Learning the Fabric shader

Posted: Thu Jan 24, 2019 11:42 pm
by FarbigeWelt
Hi Racleborgand B.Y.O.B

Memory usage for 2'700'000 with simple particle hair setup for an image with 1080^2 pixels is really quite memory demanding even with optimisation set to save memory.
Furry Ball 6.jpeg
Fussy Ball, CPU BiDir, Metropolis, 2'700'000 hairs
During the last year I've modernised Mac and PC with SSDs and more ram and the PC with a second graphic card.
If may spend your PC some more RAM, should be quite cheap to get older RAM like DDR3 1333.

Regards,
FarbigeWelt

Re: Learning the Fabric shader

Posted: Fri Jan 25, 2019 12:49 pm
by Racleborg
By the way, it might save a lot of memory if you join a patch with a few thousand hairs into one object and use a particle system to instance it over the furniture.
Thanks BYOB, I'll try that.
Memory usage for 2'700'000.....
Thanks FarbigeWelt for the example

Thanks All for the help with this, with which I hope to improve my furniture renders.

Cheers :)

Re: Learning the Fabric shader

Posted: Fri Jan 25, 2019 2:25 pm
by FarbigeWelt
Racleborg wrote:
Fri Jan 25, 2019 12:49 pm

Thanks FarbigeWelt for the example
Always welcomed.

By the way, I used ribbons for my example, what may be wrong in combination with material if it uses volumes, chose solids insteand. Density, length, etc. and color can be set using a texture, see texture tab particles in blender. Root and tip color did not have any effect on gair colors on Mac version but root and tip size does.