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bool need_attribute(Scene *scene, AttributeStandard std);		bool need_attribute(Scene *scene, AttributeStandard std);
bool need_attribute(Scene *scene, ustring name);		bool need_attribute(Scene *scene, ustring name);

void tag_update(Scene *scene, bool rebuild);		void tag_update(Scene *scene, bool rebuild);

bool has_motion_blur() const;		bool has_motion_blur() const;
bool has_true_displacement() const;		bool has_true_displacement() const;
		bool has_voxel_attributes() const;

/* Convert between normalized -1..1 motion time and index		/* Convert between normalized -1..1 motion time and index
* in the VERTEX_MOTION attribute. */		* in the VERTEX_MOTION attribute. */
float motion_time(int step) const;		float motion_time(int step) const;
int motion_step(float time) const;		int motion_step(float time) const;

/* Check whether the mesh should have own BVH built separately. Briefly,		/* Check whether the mesh should have own BVH built separately. Briefly,
* own BVH is needed for mesh, if:		* own BVH is needed for mesh, if:
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