#Meshlab fill holes how to

In case you cannot find a reliable solution to produce a watertight mesh but you are happy with an approximation of the volume there is a little trick to reduce the error.

So, if your original mesh doesn't have flipped triangles then everything is fine. Since this is a reduced mesh this could have been caused by the reduction algorithm you used. So, it's important to have this fixed, too. Now I checked your example STL and this has a couple of flipped triangles which can have a big impact on the calculated volume. This means only if the mesh is watertight and doesn't have flipped triangles the value of the volume is correct. * the triangles must have correct orientation, because otherwise you may get a negative volume for a tetrahedron instead of a positive value In order to get a correct volume your object The volume of the whole mesh is computed by summing up the volumes of the tetrahedrons. Depending on which side of the triangle the origin is the volume of the tetrahedron is positive or negative, if the origin is on the side of the triangle's normal the volume is negative and positive otherwise.

From this tetrahedron the volume is calculated. Thanks a lot!!!Ĭoral1.stl (342.95 KiB) Downloaded 193 timesįirst some words about how the volume calculation works.įor each triangle you build a tetrahedron out of the triangle and the origin. So if anyone is interested here is my file (simplified to upload). Thats why I thought Freecad with the Python console would be perfect to run it automatically. I also managed to close the hole with Netfabb pretty easy but I can't click through all the files to close them manually. The problem is that I need to have the analysis run automatically (1000 files generated every 6 weeks) which I managed writing a Python skript as we have to analyse so many frags. To studz the impact these factors can have we run a long term project and analyse our corals using a 3D scanner. The impacts of global change such as raising temperatures and ocean acidification belong to the biggest threats on coral reefs. Not when I use operation tools like cut, fuse and so on.Thanks a lot for all your answers! Sorry for posting it into the wrong topic! Just a few background information: The project is designed to be my PhD thesis on global change impacts on coral growth and performance. Is it possible that there went something wrong in the cat process? I would be very thankful if someone would be so kind and take a look at my STL.Įdit: found this post of you and will try it this way firstĮdit 2: Well it works but only if I just use groups of faces.

I've tried to fix it with meshlab but there I don't even see any holes. So I guess the problem is somewhere in the cutting process with salome. But when I check the whole STL from Salome it says the surface is closed. Now the problem is that after I've used the cat tool in Linux on my subdivided regions and used surfaceCheck on it it says that the surface is not closed. I created my geometry with Autodesk Inventor and then imported it to Salome to subdevide some regions and export them as STL like in this video. I think I have a similar problem with my STL's.

#Meshlab fill holes how to

How to handle non-closed surfaces in STL - CFD Online Discussion Forums