uv轴心缩放

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https://www.sidefx.com/forum/topic/68151/

1. vector t = chv("t");
   
2. vector r = chv("r");
   
3. vector s = chv("s")*chf("scale");
   
4. string geo = geounwrap(0, "uv");
   
5. int island = prim(0, "island", @primnum);
   
6. vector center = getbbox_center(geo, "@island=" + itoa(island) );
   
7. matrix xform = maketransform(0, 0, t, r, s, center);
   
8. v@uv *= xform;

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