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.
How do I simplify the footprints to just 4 vertices each before extruding them?
Try innerRect - you call innerRect inside a mostly square shape, and it gives you exactly 4 vertices.
Also, ignore tip about reduceGeometry(edges, 0.1) I gave up above. I meant cleanupGeometry.
How do I combine two or more shapes into one shape?
Hold shift while selecting multiple shapes, then look in the Shapes menu for Combine Shapes. You can then apply one rule to the combined shape. This shape combination will not merge coplanar faces or any kind of unioning type stuff.
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