message: Fix build breakage.
  We were declaring one too many material properties which would
  lead to out of bounds writes/reads.
diff: @@ -179,7 +179,7 @@ enum class RefractionType : uint8_t {
  // can't really use std::underlying_type<AttributeIndex>::type because the driver takes a uint32_t
  using AttributeBitset = utils::bitset32;
  -static constexpr size_t MATERIAL_PROPERTIES_COUNT = 27;
  +static constexpr size_t MATERIAL_PROPERTIES_COUNT = 26;
  enum class Property : uint8_t {
  BASE_COLOR, //!< float4, all shading models
  ROUGHNESS, //!< float, lit shading models only
  