- u -

• U : tachyonLaunchParams
• uaxs : apitexture
• uniform_color : ConeArray , CurveArray , CylinderArray , GeomSBTHG , QuadMesh , RingArray , SphereArray , TriangleMesh
• unknown_parameter : tinyobj::material_t
• update_colorbuffer : tachyonLaunchParams
• usecamfile : argoptions
• usemtl_cb : tinyobj::callback_t
• useoutfilename : argoptions
• userindex : rt_material , rt_texture