+ size_t VertexIndexCount() const noexcept { return vtx_idx.size(); }
+
+ const Model::Normal &VertexNormal(size_t idx) const noexcept { return vtx_nrm[idx]; }
+ Model::Normal VertexNormal(
+ size_t idx, const glm::mat4 &transform
+ ) const noexcept {
+ return Model::Normal(transform * glm::vec4(vtx_nrm[idx], 0.0f));
+ }