If mesh is validated after AttributeBegin call, then the AttributeBegin is never closed with an AttributeEnd, causing problems in pbrt. Co-authored-by: Kim Kulling <kimkulling@users.noreply.github.com>
If mesh is validated after AttributeBegin call, then the AttributeBegin is never closed with an AttributeEnd, causing problems in pbrt. Co-authored-by: Kim Kulling <kimkulling@users.noreply.github.com>