const std::string &get_material_slot_name() const { return material_slot; }
void set_texture(Tag, const Texture *, const Sampler * = 0);
Tag get_texture_tag(const std::string &) const;
const std::string &get_material_slot_name() const { return material_slot; }
void set_texture(Tag, const Texture *, const Sampler * = 0);
Tag get_texture_tag(const std::string &) const;