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How to judge a surface is curve surface or flat surface?

Altair Forum User

Hi,

I am the rookie of the tcl.I have some basic questions.But i can not find it in api document.

Supposed i have a solid,which has many surfaces and lines.

how to judge a surface is curve surface or flat surface?

how to judge a line is curve line or flat line?

For more,can i know the expression（formula） of surface(line)?

Thanks!

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All comments

Imoto

Hi @xiaoming

Check the following things.
・line length vs point-point distance of each edges.
・normal of surface at each points.

Related APIs.
・hm_linelength
・hm_getdistance
・hm_getsurfacenormal

tinh

There is an api but i can't remember, maybe it is removed in new version

A workaround:

A straight line is simply tested by

proc IsStraight LineID {

*createmark lines 1 $LineID

catch {hm_getbestcirclecenter lines 1 1}

}

A surface?

- create a few lines on it (extract parametric lines)

- check straight for those lines, if all straight => flat surf (not sure) /emoticons/default_rolleyes.gif' title=':rolleyes:' />