[FIX] deleting material from primitive works
[FIX] deleting material from primitive works

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