Another polyline solid subtraction problem


para-CAD
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P-Line solid subtraction issue for me tonight. 

Suppose to make a timber beam that has an ellipse cut out of the bottom. 

I could ACTUALLY build it in reality as a framer but in CA I fail. 

 

I made a rectangular beam p-line solid.

I then made an ellipse the same width.

I laid the ellipse over the rectangle and checked the make hole box on the ellipse.

 

Evidently holes can only be cut when completely contained in the other polyline solid.

Autocad is much better at this kind of thing in my opinion.

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If you are after something like this.

Place two breaks in the bottom edge.

Use Change Line/Arc on the centre section.

You can use Convert Curve To Polyline if you require a smoother curve.

 

Ah, I just reread your post and noticed you need an ellipse and not a curve - same technique though.

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Start with the rectangle (as a polyline solid), and the ellipse. 

 

Convert the ellipse to a polyline solid -- not a hole.

 

Select the rectangle, click the Polyline Subtraction icon in the Edit Toolbar, then click the ellipse.

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21 hours ago, glennw said:

You can use Convert Curve To Polyline if you require a smoother curve.

 

That works, but another way is to reduce the facit angle on the curve.

 

Uncheck Automatic Facit Angle, and make the value smaller.

 

ct1.thumb.jpg.8aa0d1c5860a10e58c4f9a8cf4560fa6.jpg

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Eric!!

 

You nailed it!  In more than one way too.

 

I hadn't thought doorway but that might be the easiest.  The client is looking to have grand arching faux stone archways dividing an open timber-framed space.  Thanks for the help.

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