I'm hoping someone can reduce my consumption of headache pills on this one...

I want to stamp an SDF generated shape in COPs oriented to the object space -Y direction, and I just can't get my head around it. What I'm struggling with is how to translate a 3D object space attribute into a rotation in 2D UV space.
I have a gradient vector on the points in 3D space from the measure SOP.

Think of the classic 'condensation drips running down a can of drink' effect. Whatever the orientation of the can the drips will run along the optimum 'gradient descent' path due to gravity (-Y).
I want to rotate a simple shape using 'stamp point' in COPs so that the shape aligns in the same way - ie its rotation is in line with the optimum 'gradient descent' path due to gravity - but translated into 2D UV space. So, when the COP based 2d texture map is applied back onto the 3D object using uv's - the shapes will be oriented correctly to 'gradient descent' in 3D space.


Can anyone point me in the right direction?

Thanks.

sorry don't have a shorter vid for just this, i plan to make one that shows the orient method and the sprite attribute method, maybe Ill just show stamped gradient, but i do have a vid that covers world orient to uv: https://www.youtube.com/watch?v=nqpovSR1nJ8&t=5s [www.youtube.com]

Thanks for the response Graham - I'll definitely be giving this a watch this as soon as I can.

Mike I'm making some simpler ones now that just cover individual aspects like world to uv.

you may not need the uv to uv seam fix part so just skip it. hip files there too
gradient to bacon stamp orient:
https://www.youtube.com/watch?v=FoiIWs8cXyk [www.youtube.com]

Graham,
That's spot on - and very generous of you. Many, many thanks. Just what I needed and I shall be studying each example in detail!

Signed up for your Patreon - and passed on the link to some others : )
For anyone passing by... : https://www.patreon.com/9hole [www.patreon.com]