[Gtkradiant] [Bug 1075] vertex mode restrictions prevent creating valid shapes

[bugzilla-daemon at zerowing.idsoftware.com]

http://zerowing.idsoftware.com/bugzilla/show_bug.cgi?id=1075





------- Additional Comments From wjoseph at europe.ea.com  2006-02-20 17:06 -------
This behaviour is by design. Use multi-vertex selection to move more than one
vertex at a time, instead of moving vertices one-by-one. Use edge-drag to move
edges instead of vertices for more predictable results.

(Copied from reply to #1065)

Brushes are internally represented as a set of planes (aka faces) - not as a 
set of vertices. The brush vertices are generated from the intersection-points 
of the planes - they must be re-generated each time the planes change. Vertex 
dragging in gtkradiant 1.5 is simulated by treating each plane as a single 
triangle. This triangle is defined by picking three brush vertices which lie on 
the plane. 
When you drag a vertex, you are really dragging one corner each of three 
triangles representing the three planes that meet at that vertex. When you drag 
an edge, you are really dragging one edge of each of two triangles representing 
the two planes that meet at that edge. As the triangle's shape changes, so does 
the plane.
If there are more than three brush vertices on the plane, and one vertex of (of 
the three defining the triangle) is moved perpendicular to the plane, more than 
one brush vertex will appear to move.

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