3d:: 2D/3D is now selectable at runtime

system.cpp

@@ -1194,7 +1194,7 @@ void set_geometry(eGeometry target) {
     if(DUAL && geometry != gArchimedean) 
       variation = ginf[geometry].default_variation;
     #if CAP_BT
-    if(geometry == gBinaryTiling) variation = eVariation::pure;
+    if(among(geometry, gBinaryTiling, gBinary3)) variation = eVariation::pure;
     #endif
    
     need_reset_geometry = true;