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Joined: Wed, Oct 29, 2008
7 Posts
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I am trying to figure out why sketches say they are overconstrained when all dimensions being added are physically possible. Why does the order you add dimensions in matter? Is there a rule for where to start dimensioning to avoid overconstraining the sketch? So far it seems that the more lines involved in the dimension, the sooner you should do it. I am trying to find "rules" so that I can pass them on to others.
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~E {Having fun with family building} Running Revit MEP 2009 on Windows XP |
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Joined: Tue, Apr 12, 2005
1310 Posts
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You don't say what the sketch applies to, but you may find that you have parameter that can be changed and then you are trying to dimension it, in which case the dimension would not be possible.
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Joined: Wed, Oct 29, 2008
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This happens to be a generic family model. To understand exactly how a seemingly correct sketch becomes overconstrained, I am experimenting with dimensioning a few reference planes in different ways and orders to find any patterns that may be there. There is nothing else in the family, and all lines are evenly spaced. I am picking different combinations of planes that are set equally apart and dimensioning them, including hitting EQ to force even spacing. depending on the order in which I add dimensions, I may or may not end up with an error that the sketch is overconstrained. For example, if I say planes A, B, C, D, and E are all evenly spaced, that is fine. If I then say lines A, C, and E are evenly spaced, that is fine as well. However, if I first say planes A, C, and E are evenly spaced and then say A, B, C, D and E are evenly spaced I get an overconstrained sketch error. My goal is simply to find the patterns.
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~E {Having fun with family building} Running Revit MEP 2009 on Windows XP |
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