The current implementation of the Construct menu, where you create construction planes, axes, and points, consists of a long list of alternatives where you have to find your exact combination of planes, faces, edges, axes, or points to accomplish what you want. I think the approach used by Geomagic/Cubify is more user-friendly. Instead of forcing the user to specify how they intend to generate their object in advance, this is inferred from the selected objects. For example, if after selecting "create a plane", you: Click on a plane. The dialog assumes you want to make an offset plane and asks for the offset. If you now select an additional point, it realizes that the only alternative that makes sense is to make an offset plane going through that point. If you instead select a plane and an axis/edge parallel to that plane, it generates an offset plane going through the axis/edge, with an optional rotation angle around the axis as well. This has two big advantages from a usability standpoint: The user can just mark what they intended to without having to find that alternative in a long list first. The plane/axis/point can be edited to a different type of definition. (My impression is that in 360 right now if you have made a plane as an offset plane but realize you actually want it to be rotated, there is no way to do that except deleting the plane and creating a new one, which would break dependencies. I might be wrong about this though.) The types of planes that can be generated in geomagic/cubify seem to be: Selecting an edge: Insert plane perpendicular to the edge at the endpoint of the edge. Selecting a plane or face: Insert plane parallel to the plane/face with a specified offset. Plane/face and point: Insert plane parallel to plane/face going through point. Edge/axis and point: Insert plane either containing or normal to edge/axis going through point. Two parallel edges/axes: Insert plane containing the two adges/axes. Three points: Insert plane going through the three points. For axes: Selecting an edge: Insert axis collinear with edge. Two planes: Insert axis at the intersection of the two planes. A plane and an edge parallel to but offset from the plane: Insert axis in the plane, parallel to edge. A cylindrical face: Insert axis passing through centerline of cylinder. A plane and a point/vertex: Insert axis normal to plane going through point. Two points/vertexes: Insert axis going through the two points. For points: Selecting nothing: Insert point at a specified coordinate. Selecting an edge: Insert point on edge at a specified fraction between the endpoints. Two intersecting edges/axes: Insert point at intersection. A curved edge: Insert point at curve center point. Three nonparallel planes: Insert point at the intersection point. A plane and an axis: Insert point where axis intersects plane. Two points: Insert point on line between points at a specified fraction of the distance. A point and a plane: The point projected onto the plane, with optional offsets in the plane. (Note that several of these alternatives are currently not available in 360 at all.)
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