topic Re: Replicating the C4D Variation shader to randomise texture placement across cloned objects in Arnold for Cinema 4D Forum

Replicating the C4D Variation shader to randomise texture placement across cloned objects

Tim_Anderson1 — Wed, 12 Aug 2020 00:03:23 GMT

I'm trying to assign a texture to cloned objects, randomising the UV offset, scale and rotation for each instance. I can do this with the C4D Variation shader, however I am unable to figure out how to replicate this with Arnold, any guidance would be greatly appreciated.

Here's an example of my use case achieved with C4D's variations shader:

Re: Replicating the C4D Variation shader to randomise texture placement across cloned objects

peter.horvath6V6K3 — Wed, 12 Aug 2020 10:23:41 GMT

Here's a simple example scene which reads the index of the clones via a user_data _int shader and generates random vectors from it which drive scale, translate and rotate of a uv_transform shader.

wood_variation.zip

Re: Replicating the C4D Variation shader to randomise texture placement across cloned objects

Tim_Anderson1 — Wed, 12 Aug 2020 12:51:33 GMT

Thank you so much for the example, Peter. Unfortunately I'm seeing the same co-ordinates repeated across all clones, but I'm attempting to achieve randomisation between each of the clones. Is this possible? This is what I see with your example:

Re: Replicating the C4D Variation shader to randomise texture placement across cloned objects

peter.horvath6V6K3 — Wed, 12 Aug 2020 13:37:45 GMT

Seems like the clone indexes are not exported? Are you using an older C4DtoA version maybe?