Xara3D can only appy an extrusion to the whole of a given shape. If you want different parts to have different extrusions, then these parts must be separately imported shapes.

But there is a wrinkle with X3D regarding what it sees as separate shapes.

If you select two separate ungrouped shapes in XaraXtreme and then paste them simultaneously into Xara3D, X3D will take the two shapes as a single entity. If you paste them separately, ie. one at a time, then X3D will see them as separate shapes. Egg's flag above consists of three separate shapes, one white, one red, one blue, and each has a different colour and extrusion.

Mike