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OTIS vs Vellum/Ziva – Missing Muscle Volume and Definition


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Hi everyone,

I’m having trouble achieving the expected muscle definition using OTIS in Houdini.

For some reason, I’m not able to get the same level of visible muscle detail that I can achieve with Vellum (please see the attached reference images). In terms of realistic muscle deformation, the results from OTIS appear much flatter and resemble something that could easily be achieved with a simple blendshape, rather than exhibiting natural muscle bulging and volume shifts.

Additionally, I’ve noticed that OTIS does not seem to produce realistic muscle behavior similar to Ziva, where muscles naturally bulge and shift upward during contraction. Instead, the deformation feels limited and lacks dynamic volume change.

I’ve attached my Houdini file (Version 21.0.631) in case anyone would be willing to take a look and help me understand what I might be missing or setting up incorrectly that’s preventing proper muscle definition with OTIS.

Any guidance would be greatly appreciated. Thanks in advance!

Muscle_Defnation in Otis.jpg

Muscle_Defnation in Vellum.jpg

Ottis Leg1.rar

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