How can a create gable roofs in City Engine 2014.1 so that they are created along the Z axis instead of X axis?
Gable always follows longest axis, or we would simply use rotateScope(). I tried that first. Here is how I did this (rule is attached):
version "2014.1" attr switchAxis = true attr gableAngle = 45 @Hidden attr originalScopeX = 0 Hidden attr originalScopeZ = 0 @StartRule RoofGableSwitchAxis --> # Gable always follows longest axis, or we would simply use rotateScope(). case switchAxis: roofGable(gableAngle) set(originalScopeX, scope.sx) set(originalScopeZ, scope.sz) rotate(rel, scope, 0,90,0) s(originalScopeZ,'scope.sx/originalScopeZ,originalScopeX) center(xz) else: roofGable(gableAngle)
I tried the rule that you wrote but I got weird roofs. The top of the roof should be even. The shapes came from Open Street Map OSM file.
You may have unnecessary points in your footprints - simplify them to just 4 vertices and I think you should get better results.
You might also try reduceGeometry(edges, 0.1) to reduce the vertex count - the 0.1 part... look in the help manual because I can't remember the exact details of the tolerance parameter.
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