message: fix: removed useless z-sort
diff: @@ -40,17 +40,11 @@ function renderableSort(a: Renderable<RenderableValues & BaseValues>, b: Rendera
  const drawProgramIdB = b.getProgram('color').id
  const materialIdA = a.materialId
  const materialIdB = b.materialId
  - const zA = a.values.boundingSphere.ref.value.center[2]
  - const zB = b.values.boundingSphere.ref.value.center[2]
  if (drawProgramIdA !== drawProgramIdB) {
  return drawProgramIdA - drawProgramIdB // sort by program id to minimize gl state changes
  } else if (materialIdA !== materialIdB) {
  return materialIdA - materialIdB // sort by material id to minimize gl state changes
  - } else if (zA !== zB) {
  - return a.state.opaque
  - ? zA - zB // when opaque, draw closer elements first to minimize overdraw
  - : zB - zA // when transparent, draw elements last to maximize partial visibility
  } else {
  return a.id - b.id;
  }
  