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Active Member
cbaker
Posts: 10
Registered: ‎02-21-2013
Message 1 of 11 (1,586 Views)

convert irregular 3d shape to solid to calculate volume

1586 Views, 10 Replies
02-21-2013 10:59 AM

Hi,

 

Im new to autocad. I have a set of 8 coordinates that outline a pit. I have been asked to calculate it's volume. I have input the coordinates, and have produced a 3D image of the pit. I was hoping to be able to convert the object (the pit) that I have created to a solid, so I could then determine the volume, although it is proving to be difficult.

 

Does anyone have any suggestions as to how I could calculate the volume of this pit? Am I going aboout it the right way?

 

Cheers,

 

Chris 

*Expert Elite*
M_Hensley
Posts: 1,676
Registered: ‎12-11-2003
Message 2 of 11 (1,577 Views)

Re: convert irregular 3d shape to solid to calculate volume

02-21-2013 11:33 AM in reply to: cbaker

I am assuming that 4 coordinates represent the bottom of the pit and the other 4 the top.

Use 3DPOLY command to create polyline outline of each shape.

Use LOFT command to create a 3Dsolid of the 2 shapes.

Use MASSPROP command to see the volume of the solid.

*Expert Elite*
JDMather
Posts: 26,181
Registered: ‎04-20-2006
Message 3 of 11 (1,570 Views)

Re: convert irregular 3d shape to solid to calculate volume

02-21-2013 11:52 AM in reply to: cbaker

Attach the file here if you can't figure it out.

Please mark this response as "Accept as Solution" if it answers your question.
-----------------------------------------------------------------------------------------
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http://home.pct.edu/~jmather/content/DSG322/inventor_surface_tutorials.htm
Active Member
cbaker
Posts: 10
Registered: ‎02-21-2013
Message 4 of 11 (1,539 Views)

Re: convert irregular 3d shape to solid to calculate volume

02-21-2013 11:46 PM in reply to: cbaker

Thanks for your help! Now my object has sides, but can I use the LOFT command to fill in the top and bottom? ie, fill the 3DPOLY shapes I created from my coordinates to make a solid object?

 

 

Active Member
cbaker
Posts: 10
Registered: ‎02-21-2013
Message 5 of 11 (1,532 Views)

Re: convert irregular 3d shape to solid to calculate volume

02-22-2013 01:06 AM in reply to: cbaker

Sorry, there are actually 10 points. I have attached what I have managed to do so far. Thanks again for your help.

 

Chris

*Expert Elite*
Patchy
Posts: 6,208
Registered: ‎09-16-2009
Message 6 of 11 (1,523 Views)

Re: convert irregular 3d shape to solid to calculate volume

02-22-2013 06:28 AM in reply to: cbaker

Impossible for autocad to do such calculation.

The surface is not planar, it needs ridges and valleys created by you to make surfaces and then it can do solid.

 

Active Member
cbaker
Posts: 10
Registered: ‎02-21-2013
Message 7 of 11 (1,497 Views)

Re: convert irregular 3d shape to solid to calculate volume

02-22-2013 11:27 AM in reply to: Patchy

I have managed to create an enclosed object. Now I want to make the object solid, I have tried CONVTOSOLID, although this command does not seem to work. Can a volume be calculated for an irregular object such as this? Please see attached.

 

How would I go about creating ridges and valleys?

 

Thank you for your time,

 

Chris

*Expert Elite*
Patchy
Posts: 6,208
Registered: ‎09-16-2009
Message 8 of 11 (1,469 Views)

Re: convert irregular 3d shape to solid to calculate volume

02-22-2013 03:33 PM in reply to: cbaker

Union then convtosolid.

New Member
tballw
Posts: 1
Registered: ‎02-22-2013
Message 9 of 11 (1,460 Views)

Re: convert irregular 3d shape to solid to calculate volume

02-22-2013 09:24 PM in reply to: cbaker

You can use SURFPATCH to create surfaces to cap the loft.  Just select the top edges of the loft the first time you run SURFPATCH, and then select the bottom edges the second time.  You should then have three surfaces that enclose a volume: the loft and the two endcaps created from SURFPATCH.  You can use the SURFSCULPT command to create a solid from these three surfaces.  I'm not sure how well SURFSCULPT works, but if it does work then you can use MASSPROP to get the volume of the solid.

Active Member
cbaker
Posts: 10
Registered: ‎02-21-2013
Message 10 of 11 (1,453 Views)

Re: convert irregular 3d shape to solid to calculate volume

02-22-2013 11:53 PM in reply to: Patchy

Thanks everyone, These solutions helped.

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