.setMaterialRange(20, 1, "green") // right wall
.setMaterialRange(21, 1, "red") // left wall
.setMaterialRange(22, 5, "white") // short block
.setMaterialRange(27, 5, "white"); // tall block
this.cornellBox = new BoundingIntervalHierarchy(materialMap);
this.light = cornellBox.createLight();
}