Re: Changing surface type
When converting a polyline to a surface/polygon, the order in which the vertices are selected is important. If you just select all the vertices and then chose "create ordered surface", the surface is a mess as the order of the vertices is by chance of whatever. Instead, select the vertices one by one (while shift is pressed) counter-clockwise.
BTW: as an AC3D improvement suggestion: why not store the creation order of the vertices of a polyline and use this as the default order for surface creation? This is at least how other 3D modellers are handling the same issue.
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