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Verysame Verysame avatar image
Verysame Verysame asked ·

XPtrail random color per spline

Hi there,

I know there are a few ways to get random colors on XPemitter. But what about an XPtrail?

I'm trying to get different colors per spline but I'm struggling with the UV mapping. I can get something when the projection type is, for instance, V, but is not quite exactly what I'm looking for. In fact, right now the gradient applies to the whole chunk, vertically so each trail has the same gradient applied to it.

What I need is each trail with a different color. Maybe I shouldn't use a ramp at all?

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Peter Horvath avatar image
Peter Horvath answered ·

If you just need random colors, you can use a utility shader with 'uniform ID' color mode.

Another option is to enable 'Export IDs' in the Arnold Tag of the trail and use a random shader with a user_data_int (Attribute: curve_id) as input.

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Verysame Verysame avatar image
Verysame Verysame answered ·

Awesome!

Thank you, Peter, they both work great.

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