docs: public void removePostEffect(GVRMaterial postEffectData) {
          if(mPostEffects == null)
              return;
          
          for (int i = 0; i < mPostEffects.getPassCount(); ++i)
          {
              GVRRenderPass pass = mPostEffects.getPass(i);
              if (postEffectData == pass.getMaterial())
              {
                  mPostEffects.removePass(i);
              }
          }
      }