Sam Osborne

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About Me

EXPERTISE
VFX Artist
INDUSTRY
Film/TV

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United Kingdom
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Houdini Skills

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Recent Forum Posts

Vellum - Using rest blend and pin to target at the same time Aug. 23, 2023, 12:49 p.m.

I am trying to inflate an animated character using vellum and a custom leading edge for inflation.

I have 2 meshes that are both animated, the first is the normal character (let's call it charA) the other is the inflated character (let's call this charB). I am running a pyrosource spread SOP over a static charA and copying the temperature attribute generated onto the animated charA. This gives a nice natural leading edge for the inflation.

I am then using the animated attribute to lerp between charA and charB and making this my target for vellum. Inside the vellum solver I am using a restblend with the blend set to a constant of 1. This works well, the character loosely follows the animation and inflates. Which makes sense as it is calculating the restlength per frame which are growing and shrinking as the character is animated.

However, the issue is that I want to be able to control how close the cloth follows to the animation, pinning in certain areas so I can art direct my shot more. When I use a pin to target constraint it is ignored whilst also using the restblend inside the vellum solver, is it possible to use these together? Or is there a better method to control this?

Attached hip file of my current setup using the rubbertoy as my character. Thanks in advance for any help or advice.