message: Fix source typo (bug?)
diff: @@ -295,7 +295,7 @@ export default class SceneObjects {
  let materialId = `${m.type}/${m.vertexColors}/${m.color.toJSON()}/${m.side}/${
  m.transparent
  - }/${m.opactiy}/${m.emissive}/${m.metalness}/${m.roughness}/${m.wireframe}`
  + }/${m.opacity}/${m.emissive}/${m.metalness}/${m.roughness}/${m.wireframe}`
  materialId += `--${Object.keys(mesh.geometry.attributes).toString()}--${!!mesh
  .geometry.index}`
  