message: Fix uninitialized vectors in envmap processing
diff: @@ -260,7 +260,7 @@ void CubemapSH::renderSH(const Cubemap& cm,
  for (size_t x=0 ; x<dim ; ++x, ++data) {
  double3 s(cm.getDirectionFor(f, x, y));
  computeShBasis(SHb.data(), numBands, s);
  - double3 c;
  + double3 c = 0;
  for (size_t i=0 ; i<numCoefs ; i++) {
  c += sh[i] * (K[i] * SHb[i]);
  }
  @@ -336,7 +336,7 @@ void CubemapSH::renderPreScaledSH3Bands(
  [&](CubemapUtils::EmptyState&, size_t y, Cubemap::Face f, Cubemap::Texel* data, size_t dim) {
  for (size_t x=0 ; x<dim ; ++x, ++data) {
  double3 s(cm.getDirectionFor(f, x, y));
  - double3 c;
  + double3 c = 0;
  c += sh[0];
  c += sh[1] * s.y;
  c += sh[2] * s.z;
  