obj = selection[1]
polyop.setMapSupport obj 0 true
polyop.setNumMapVerts obj 0 (getNumVerts obj)
polyop.setNumMapFaces obj 0 (getNumFaces obj)
polyop.defaultMapFaces obj 0
verts = polyop.getNumVerts obj
arr = #()
for i=1 to verts do append arr i
polyop.setVertColor obj 0 arr (Color 128 128 128)
edges = polyop.getNumEdges obj
for i=1 to edges do
(
	faces = polyop.getEdgeFaces obj i
	if (faces.count > 1) then
	(
		c1 = polyop.getFaceCenter obj faces[1]
		c2 = polyop.getFaceCenter obj faces[2]

		n1 = polyop.getFaceNormal obj faces[1]
		n2 = polyop.getFaceNormal obj faces[2]

		vec = normalize (c1 - c2)
		convex = 1
		if (dot vec n1) < 0 then convex = -1
		flatness = (dot n1 n2)
		if flatness < 0 then flatness = 0

		curvature = ((1.0 - flatness) * convex) * 0.5 + 0.5
		/*print "!"
		print convex
		print flatness
		print curvature*/
		if (curvature < 0) then curvature = 0
		if (curvature > 1) then curvature = 1

		verts = polyop.getEdgeVerts obj i
		color1 = polyop.getMapVert obj 0 (verts[1])
		color2 = polyop.getMapVert obj 0 (verts[2])

		color1.x *= curvature * 2 -- multiply 2x
		if (color1.x < 0) then color1.x = 0
		if (color1.x > 1) then color1.x = 1

		color2.x *= curvature * 2
		if (color2.x < 0) then color2.x = 0
		if (color2.x > 1) then color2.x = 1

		polyop.setMapVert obj 0 (verts[1]) [color1.x, color1.x, color1.x]
		polyop.setMapVert obj 0 (verts[2]) [color2.x, color2.x, color2.x]
	)
)
update obj