Problem with skinning and Point on Poly Constrain

[weerapot-chaoman]

Hello there, I am very new to maya and currently I am doing character set up.

My character has scale on his back so I model the scale separately from the body

• I grouped each of my scale
• I move the group pivot so it is ready to constrain to the body
• I used Point on Poly constrain to constrain the scale group to a face of the body
• I moved the body, the scale followed
• When I skin the body to my joints, I rotate my joints, polygon bends, but the scale doesn't follow

here is my rig for check: http://www.mediafire.com/?u194tbfos6ktyjx 
- I delete most part of my rig+joint so the file is not messy
- I didn't skin the body to the joint yet (i detached it). U can re-skin it, move the joint and see how the scale doesn't follow the body.

Thanks in advance =). 

[asif-raza-changezi--3]

hmm.! instead of poly constrain you can do a simple trick to make this work.. you can use "rivet" script for this to work. i used it many times and it really works. i used it  'buttons on coat'.. there is another way beside rivet script you can actually create hair.and delete the hair node after creating than parent the scale on Follicles .. its a little bit harder than rivet .. i tested it out on ur character and it works do it and let me know if you have any problem.

[ljilekor]

PointOnPoly constraint is way more robust and versatile than the rivet script , though.

To apply a pointOnPoly constraint, the source object needs UVs.

U and V coordinates are used to accuratly transform the constrainted object on the sourcemesh. (Eg on a vertex, an edge or anywhere on a poly).

When creating UV's it's important that no poly's overlap in UV space (logic because otherwise a UV coordinate represents more than 1 point in 3D space).

So the best method to UV unwrap for use with pointOnPoly is 'automatic Mapping'.

Hope this helps.