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j00ey

Skeleton Mirror - problem with group field

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I'm following this great youTube from Christopher Rutledge and having a problem with the skeleton mirror SOP. If I leave the group field set to * it mirrors the whole skeleton, which gives me duplicated joints - but if I group some points and use that group name it errors out. In fact as soon as the input has a point group at all it throws an error - even if I leave the group field set to *.

The node interface appears to be different in my build [18.5.499] so I wonder if it's currently broken... I tried the same thing with a Mixamo skeleton in case there's something wrong with my skeleton, and I've tried group joints SOP, group SOP etc etc input but the behaviour is the same..

Thanks for reading

 

 

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@j00ey Please Ask this Dude for the File and asset if he can share here. I was Like always to Fast to Take from GitHub File :rolleyes:. ABRAKADABRA "CIRILICA"
 

Cata.gif

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Hi Tesan. Thanks for the pointer, I'll drop him a note.

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Posted (edited)

hey guys! this asset does not use skeleleton mirror sop, some messy things is going on there. so I would make some quick clear example. 
this works in 18.5.408

 

mirror_rig.hiplc

Edited by mr.prudov
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Ah ok, interesting, it doesn't work in 18.5.499. It's doing the same thing as in my scene, I guess it must be a bug in that case. Thanks very much in any case!

skeleton_mirror.png

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Ok, well. Please try to report a bug to sidefx. Later I’ll try to implement this in vex if this can help, or you can just download the previous Houdini build

 

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Yes I've submitted a bug report. If you do do a vex version I'd be very interested to see that..

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Posted (edited)

huh dig some theory and here it goes. mirrors only about the origin
here is the cool stuff about the mirroring matrices, if someone wants to know more

the basic idea is this:
image.png.28e76f87fc41dbabdf72def4962512bb.png

i've only implemented the rotation part. 

mirror_rig_vex.hiplc

Edited by mr.prudov

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Thanks Nicolai - I will see if I can wrap my head around what's going on in your file. I've never been too good at matrix maths but learning gradually!

The bug is fixed in 18.5.523 daily build too btw.

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