comp(f) roof problem

Briande_Vogel1

Hi,

I have a gable roof and on one side of the gable I want to create a dormer window.
But when I use the comp(f) tool to select the top of the roof I'm hitting a problem.

When the angle of the roof is less than 45 degrees I cannot specify which side of the top of the roof I want to modify.
comp(f) {top:TopRoof} gives both sides of the top of the roof, when the angle is more than 45 degrees I can use instead of "top" the "front" and "back".

Anyone know a fix for my problem to select the front or back with an angle less than 45 degrees?

cheers,

Brian

MatthiasBuehler1

Hey !

good question.


Look at the CGA Reference and read the comp(f) documentation carefully. You'll notice more selectors.


What I usually do is

comp(f) {bottom : NIL | all : RoofPlane. }

If you need a specific orientation, you can play with

comp(f) {bottom : NIL | world.south : SouthernRoofPlane | all : RoofPlane. } // DID NOT TEST THIS.



otherwise, go via an index attribute to manually choose.

attr roofFaceID = 0

comp(f) { bottom : NIL | all = RoofPlanes } // NOTE THE '=' ! This puts all shapes in 1 new shape, instead of n

RoofPlanes -->
    comp(f) {sel ( roofFaceID) : RoofPlaneWithDormer. | all : NoDormers }


Ok ?

matt