Symbol not mapping onto 3d image

Question

I'm trying to draw a coin and have successfully mapped the head onto one side of the coin, but for some reason tails isn't mapping. I did the exact same thing to tails as I did to head - I turned the vector image into a symbol and then map it onto a face. It's not a problem with the face because when i switch the positions of the heads and the tails, the heads shows up and the tails still doesn't show up.
Does anyone know what's going on?
The heads is below, and the tails simply does not show up.

Answer 1

But did you have to reposition the mapped symbol, since adding anchors also add surfaces
No. I did exactly what my instructions indicated: I simply positioned the Symbol for mapping onto the front surface, with no scaling. After Illusrtator rendered the result, I selected Add AnchorPoints twice.
The distortion was due to the extended handles of the middle point which gives the front surface its concave shape. Adding anchorPoints effectively shortens the handles, thereby lessening their distortion effect. That does not necessarily add surfaces to the model. A 3D Effect model does not necessarily create additional surfaces for each "patch" defined by anchorPoints. You can see that easily by simply extruding a filled, unstroked ellipse into a cylinder with open endcaps: One surface, despite the four anchorpoints in the section.
Moreover, with the preview checkbox on, the 3D Effect interface highlights the surfaces on your model as you page through them in the Map Art dialog.
OF COURSE the model's section path needs to be drawn with some sense about what 3D Effect will have to do to it geometrically, and about the scale of the 3D model settings relative to the size and aspect ratio of the mapped artwork (thus my admonitions to that effect in my second post). One can't just willy-nilly apply elaborate automatic effects to any carelessly-drawn path and expect results to work right. But assuming appropriately-drawn sections for the extrusion, adding anchorPoints can be an effective means by which to correct distortion caused by long curve handles--just as it can also be used to more closely approximate uniform spacing of Blend steps along curves spines. The long radius concave front of a trade show backdrop is a case-in-point.
JET