+ SCM
+ vertex3d_position (SCM vertex) {
+ irr::video::S3DVertex* s3dvertex = unwrap_vertex3d (vertex);
+ return scm_from_vector3df (s3dvertex->Pos);
+ }
+
+ irr::video::E_VERTEX_TYPE
+ scm_to_vertex_type (SCM vertex_type)
+ {
+ char* type = scm_to_utf8_stringn (scm_symbol_to_string (vertex_type), NULL);
+ if (!strcmp (type, "standard"))
+ {
+ return irr::video::EVT_STANDARD;
+ }
+ else if (!strcmp (type, "2tcoords"))
+ {
+ return irr::video::EVT_2TCOORDS;
+ }
+ else if (!strcmp (type, "tangents"))
+ {
+ return irr::video::EVT_TANGENTS;
+ }
+ else
+ {
+ scm_error (scm_arg_type_key, NULL, "Wrong vertex_type: ~S",
+ scm_list_1 (vertex_type), scm_list_1 (vertex_type));
+ }
+ }
+