@Override
    public void setProfiler(AppProfiler profiler) {
        this.profiler = profiler;
    }
return the shadow camera to use for rendering the shadow map according
the given index

@param shadowMapIndex the index of the shadow map being rendered
@return the shadowCam
jme3-vr/src/main/java/com/jme3/shadow/AbstractShadowRendererVR.java