Memory disk problem when rendering

[Pierre-Alexandre_Loy]

Hello, I'm working on a big city scene. There are a lot of buildings, I use instances, there are a lot of textures. When I try to calculate it, my disk space is reduced progressively, and finally I get an error message telling me that I have no more disk space.
How to solve this problem ? and is it possible to allocate disk memory to an external hard drive?
I'm on Mac, Cinema 4D R18, OS 10.14.3, Arnold 5.3.1.1
Thanks for your help.

[Stephen.Blair]

Arnold doesn't create texture files, and except for the render output, I'm not sure what else Arnold would create.

What files are being created? Is it CINEMA 4D that is creating the files?

[peter.horvath6V6K3]

If auto tx is on (which is the default) Arnold generates .tx files for each texture, which could take a lot of disk space. If you disable auto tx in the render settings these files are not generated, however your render time may suffer. I'm not sure that's eating up your disk though, just guessing here.

Another option could be using Substance Shaders which also bake files into the project tex folder, however that should not take much space.

Other than that C4DtoA/Arnold does not write to disk as far as I can tell.

[Pierre-Alexandre_Loy]

Thank you for your quick replies.

yes Arnold created .tx files. So now that these files are created should I disable auto TX?
I am trying to calculate the image in the C4D viewer.

[peter.horvath6V6K3]

If you disable auto tx, Arnold will not generate tx files. If you keep 'Use existing .tx textures' on, then Arnold will load a tx file when exist, otherwise uses the original texture and executes tiling and mip-mapping during the render, which may be costly.