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Masoud

In Vellum , is it possible to change the shape of input geometry, over time?

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Hi;

In Vellum , is it possible to change the shape of input geometry, over time?
I have a line in my scene that grows (in length) over time, and I would like to use it in vellum-hair, but it seems that vellum just uses first frame.


Thanks.

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Yes, you want the Vellum Rest Blend DOP, which you can point at an external SOP that animates your rest geometry. It will update the rest state of a specific set of constraints based on the input Rest geometry.  With 17.5 there is a help example for Vellum Rest Blend SOP that shows some uses of it.  Attached is an example of lengthening hair curves over time.  Note the rest topology has to match the original geometry, i.e. you can't add points, but you can transform them in various ways.

 

grow_hair.hip

Edited by johner
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Any way to update topology? 

I am trying to carve out a curve>polywire, basically grow a shape over time along the curve and make it vellum cloth, live and waving as it grows.

Seems like trying a sop in dops does not update it over time like you can with constraints.

Cheers!

  

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