Don't generate tangents if the geometry already has them.
Don't generate tangents if the geometry already has them.

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