code: function (value) {
                      if (this._transparencyMode === value) {
                          return;
                      }
                      this._transparencyMode = value;
                      if (value === BABYLON.PBRMaterial.PBRMATERIAL_ALPHATESTANDBLEND) {
                          this._forceAlphaTest = true;
                      }
                      else {
                          this._forceAlphaTest = false;
                      }
                      this._markAllSubMeshesAsTexturesDirty();
                  }
docs: Sets the transparency mode of the material.