example of Mesh Healer "Auto Rebuild Model" button

[yueyueyueniaofei]

I used the generalOffsetMesh function in healer.py to fix a model, but it only rebuild mesh with more errors. The result is different from the 'Auto Rebuild Model' in MeshInspector, and it increases the number of original errors in the model. Could you provide a complete example of using 'Auto Rebuild Model'?"

[Grantim]

Hello!

Actually, generalOffsetMesh is the same function that is used in Auto Rebuild Model, could you please provide what parameters have you tried for both app and the function?

[yueyueyueniaofei]

Thanks for your reply.
It seems that "Auto Rebuild Model" might indeed follow a more comprehensive process that first addresses model errors (such as holes and self-intersections) before applying meshing operations, unlike generalOffsetMesh, which may simply create a mesh without fixing structural issues.
My model has some errors, and below are the error results when using 'Auto Rebuild Model' and generalOffsetMesh.

[Grantim]

You are almost right, "Auto Rebuild Model" uses generalOffsetMesh but then if any issue remained it proceed with "Repair Selected" (at most two iterations). So what you might need to do is remove small components and enable decimation.

largestCompBitSet = mm.getLargestComponent( resMesh )
resMesh.deleteFaces( resMesh.topology.getValidFaces() - largestCompBitSet )
resMesh.pack() # optional, if you call decimation - consider enabling .packMesh in settings instead of this line

Actual "Repair Selected" is set of much more complex algorithms that are called in specific order, translate it to python might be big effort, usually it is recommended to have specific fixes for each type of cases instead of more common "Repair Selected"

[yueyueyueniaofei]

"Your response was very helpful, and my current result is similar to 'Auto Rebuild Model.' However, I still have a concern: the result from 'Auto Rebuild Model' changes the edges of the model, as shown in the image below. Is there a better strategy for using Marching Cubes to improve the edges of the model so that they more closely resemble the original?"

[Grantim]

"Auto Rebuild Model" voxelize the mesh and then retriangulate so it is expected that topology changes, You can try other Modes in rebuild settings but all of them will rebuild whole mesh. Also you can try "Repair Selected" to fix issues without rebuilding whole model.