Need advice shell surface
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 From:  Michael Gibson
2614.10 In reply to 2614.9 
Hi Anis,

> I use loft because the area is not planar. You can check on my red curve.

I see - but actually the exact same advice I mentioned previously still applies.

Just use the red curve as the cutting object the same way I used the line in my previous example.

Any time you want to make a cut that follows a 2D profile you can use that method - for example here I have exaggerated the curvature just to clarify that the end result does not have to be planar:





Select the solid and run boolean difference, and select the profile curve as the cutting object to get this result:



Just discard the pieces you do not need:



In this case you don't get a plane as the result surface, but the result is similar in that there is no pole. Instead it is an extruded surface (with a line as the cutting curve, it will be a plane since the extrusion of a line is a plane), here are what the control points look like when turned on:




Not only can you avoid getting a surface with a pole with this method, it is generally faster as well - just cap off your base shape so it is a solid, then you can carve off chunks by doing a boolean with a profile curve as shown here.

When you start with a solid, then the boolean cuts will generate solid pieces with the curves leaving extrusions behind to form the caps.

- Michael

EDITED: 3 May 2009 by MICHAEL GIBSON


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 From:  Anis
2614.11 In reply to 2614.10 
Ohhh, my fool Micahel.... :(
Ya, I see know. So to create 3D model we not have to use surface from beginning.

Thanks Sir !!!
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 From:  Michael Gibson
2614.12 In reply to 2614.11 
Hi Anis, yup that is correct! :)

When your end result is made up of mostly extruded shapes, it can be easier and faster to work more with solids throughout rather than doing things by one individual surface at a time.

That's due to that mechanism of doing a boolean between a solid and a curve which generates solid results...


When your end result is made up of more freeform surfaces (that may swoop around in multiple directions instead of curving only in one direction) and not so many extrusions, that's generally when you may need to use a more "one surface at a time" type method.


- Michael
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