Another pc.shape fix.
Another pc.shape fix.

--HG--
branch : feature/math-objects

shinate/engine,horryq/engine-1,RainsSoft/engine,RainsSoft/engine,3DGEOM/engine,MicroWorldwide/PlayCanvas,nizihabi/engine,sereepap2029/playcanvas,SuperStarPL/engine,RainsSoft/engine,horryq/engine-1,sanyaade-teachings/engine,guycalledfrank/engine,H1Gdev/engine,maxwellalive/engine,sereepap2029/playcanvas,SuperStarPL/engine,sereepap2029/playcanvas,shinate/engine,guycalledfrank/engine,nizihabi/engine,3DGEOM/engine,sanyaade-teachings/engine,SuperStarPL/engine,aidinabedi/playcanvas-engine,playcanvas/engine,aidinabedi/playcanvas-engine,shinate/engine,3DGEOM/engine,nizihabi/engine,sanyaade-teachings/engine,MicroWorldwide/PlayCanvas,maxwellalive/engine,H1Gdev/engine,playcanvas/engine,maxwellalive/engine,horryq/engine-1