gl-mesh3d - Light position and shading fix #16
                
     Merged
            
            
          
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The
gl-mesh3dhad different light position setup when compared togl-surface3dwhich resulted in wired behaviour.This PR would make the lighting configuration similar to
gl-surface3dnoting that ingl-surface3dBeckmann algorithm is applied whereas in
gl-mesh3dwe continue to use cookTorrance.Please refer to plotly/plotly.js#3415 for more info.
@etpinard