topic Re: Surface to Solid watertight problems in AutoCAD Forum

Surface to Solid watertight problems

alvaro_garci — Thu, 02 Mar 2023 16:39:57 GMT

Hello all,

I am trying to create a solid joining the surfaces I have but it keeps telling me "no watertight volume created". I tried everything, making the geomtry smoother, dividing the solid in sections, but there are some that aren't supposed to be closed to get a watertight volume. I also went joint by joint checking if there are any gaps but I couldn't find the problem.

I would appreaciate some help here

I attach the model.

Thank you

Re: Surface to Solid watertight problems

pendean — Thu, 02 Mar 2023 16:52:31 GMT

Which ones? Lots of 'air' between your shapes

Re: Surface to Solid watertight problems

alvaro_garci — Thu, 02 Mar 2023 17:01:29 GMT

So the red coloured and yellow coloured shapes are already closed as solids. The white shapes are the ones I can't transform into solids

Re: Surface to Solid watertight problems

leeminardi — Thu, 02 Mar 2023 19:39:46 GMT

Try scaling the collection of surfaces, regions... up by a bit and then use surfsculpt.

For example, I scaled the white objects by 1.1, then successfully used surfsculpt and finished by scaling the solid by 0.9091 ( 1/1.1) . The red object is a solid.

P.S. I forget where I learned the scaling trick.

Re: Surface to Solid watertight problems

alvaro_garci — Fri, 03 Mar 2023 09:52:54 GMT

thank you very much

Re: Surface to Solid watertight problems

allen_ralph_thompson_iii — Tue, 17 Mar 2026 18:05:37 GMT

Thank you for the helpful Tip!

I found another way to make your Mesh watertight.

I am using AutoCAD Architecture 2023

Change your workspace to 3D modeling

Use the Thicken command to thicken the mesh and convert to a surface.

Go to Mesh tab and convert the surface into a mesh.

Remove Creases then Close Holes

Convert to Mass Element

Then convert to a 3D Solid.