i have a question.
i have a geometry it made using subdivide sop before.
but i want to get the geometry before using subdivide.
is it possible?
undo subdivision
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- YoungJun You
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- animatrix_
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Houdini doesn't have a built-in tool that does this but there is a paper that reverses Catmull Clark subdivision surfaces that can be implemented in Houdini:
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- neil_math_comp
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If you have the original HIP file, hopefully you can get it from there, else undoing subdivision will be very difficult… unless the upcoming PolyReduce SOP in Houdini 16.5 will do what you need. See the launch video [vimeo.com] starting around 29:37, particularly starting at 30:50 for quad-preserving reduction. 
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- AlanZ
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animatrix_
there is a paper that reverses Catmull Clark subdivision surfaces that can be implemented in Houdini
Found this post while trying to make an ‘un-subdivider’. If anyone also follows this paper, there seem to be some typos in the last boxed formula (Page 5, bottom of the left column). The original is
, and imo it should be
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- AlanZ
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