A list of suffixes to append to the base filename that specifies the
[viz.POSITIVE_X, viz.NEGATIVE_X, viz.POSITIVE_Y, viz.NEGATIVE_Y, viz.POSITIVE_Z, viz.NEGATIVE_Z] faces of the environment map. If
viz.AUTO_COMPUTE is specified, then the suffixes will be auto-detected using the following common formats:
['_posx','_negx','_posy','_negy','_posz','_negz']
['_right','_left','_up','_down','_front','_back']
['_r','_l','_u','_d','_f','_b']
['_rt','_lf','_up','_dn','_fr','_bk']