Changing Parameters often messes up Sketches

[Bayesian]

I often try to use the sketcher to make something parametrical, for example a rounded box may have the width, height and radius as a parameter.

Now, when those parameters change, the constraint solver will often mess up the sketch, for example by flipping one of the corner arcs, and not being able to solve correctly.

The way I specify my sketches often leaves additional solutions, for example with rounded boxes. Is there any way I can specify that something has to be on the right of the other, or something like that? I also may be missing something about geometric constraints.

[openBrain]

You can have a look at this thread (second half part will be the more interesting for you).

[chrisb]

Models become more stable with respect to flipping if you can use angular constraints instead of linear dimensions. Angles are directed, while distances are not - except those from the origin, which you get if you select only one point and apply a dimensional constraint.