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		std::vector<Material> materials;
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		std::vector<Material> materials;
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		// -------- FUNCTIONS -----------
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		// -------- FUNCTIONS -----------
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		/// Get an axis aligned bounding box for the model.
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		/// Get an axis aligned bounding box for the model.
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		void get_bbox(CGLA::Vec3f& p0, CGLA::Vec3f& p7) const;
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		bool get_bbox(CGLA::Vec3f& p0, CGLA::Vec3f& p7) const;
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		/// Get a bounding sphere for the model.
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		/// Get a bounding sphere for the model.
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		void get_bsphere(CGLA::Vec3f& c, float& r) const;
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		bool get_bsphere(CGLA::Vec3f& c, float& r) const;
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		/// Returns true if at least one normal has been defined.
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		/// Returns true if at least one normal has been defined.
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		bool has_normals() const
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		bool has_normals() const
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		{
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		{
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			return normals.no_faces()>0;
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			return normals.no_faces()>0;