topic Re: Convert 3D faces to 3D solid in AutoCAD Forum

Convert 3D faces to 3D solid

tsakani — Wed, 05 Feb 2025 16:45:05 GMT

I have a structure that is made up of 3D faces that I want to convert to a 3D solid. I've tried to convert it to a surface, then thicken it but when I use the convert to 3D solid it doesn't allow it. I've also checked through the forum but all the topics seems not to help me achieve this. The attached is a mine tunnel made up of 3D faces due to the complexity of its curvature. I could change it but all existing designs are like that but I'd like to be able to calculate volumes, which are easier using 3D solids than 3d faces

Re: Convert 3D faces to 3D solid

autoid374ceb4990 — Tue, 04 Feb 2025 16:18:20 GMT

I do not see any attachment????

Re: Convert 3D faces to 3D solid

tsakani — Wed, 05 Feb 2025 16:45:37 GMT

I didn't notice that i forgot to add an attachment

Re: Convert 3D faces to 3D solid

autoid374ceb4990 — Thu, 06 Feb 2025 14:11:34 GMT

If all of your tunnels are as simple as your drawing, just multiply the end area by the length.

Re: Convert 3D faces to 3D solid

leeminardi — Thu, 06 Feb 2025 17:18:45 GMT

YOu can use the region command to convert 3dfaces to regions. Surfsculpt can then be used to create a solid. For your model surfsculpt could not find a watertight model so I added planar surfaces aligned with the ends and then successfuly used surfsculpt.

Re: Convert 3D faces to 3D solid

autoid374ceb4990 — Thu, 06 Feb 2025 21:06:43 GMT

Just out of curiosity because I am using a really old AutoCAD version (R14) with no SURFSCULPT command, what was your volume calculation?

Re: Convert 3D faces to 3D solid

parkr4st — Thu, 06 Feb 2025 21:14:54 GMT

The root cause is apparently the ends do not align to the top. Zoom in and there is a gap along much of the edges.

Is the "bottom" surface not level?

plines outer edge both ends and loft. MaSSPROP Vol is 265.8948 cubic units

Re: Convert 3D faces to 3D solid

leeminardi — Fri, 07 Feb 2025 02:15:38 GMT

265 seems resonable as box containing the object would be 12x5x5 = 300 and the volue should be lest than that.

Re: Convert 3D faces to 3D solid

tsakani — Fri, 07 Feb 2025 05:34:55 GMT

That worked. However, I used the patch function on each end, then surfsculpt to a 3d solid. The volume is 265.8996. Thanks alot