Meshroom: MeshResampling vs MeshDecimate

[Vekolb]

I am new to this and in the search to optimize reconstruction process I am having a hard time figuring out the difference between MeshResampling and MeshDecimate tool. They both seem to do much the same.
I did read this:
https://meshroom-manual.readthedocs.io/en/latest/node-reference/nodes/MeshResampling.html

But it doesnt say much. Anyone have an example of the difference when say use 0.5 ratio on both. Which will you use for what?

[fabiencastan]

MeshDecimate kills vertices to reduce the density, so the vertices at the end already exist in the original mesh.
MeshResampling will recreate vertices on the surface with a uniform density, so there is no common vertice with the original mesh.

[Vekolb]

MeshDecimate kills vertices to reduce the density, so the vertices at the end already exist in the original mesh.
MeshResampling will recreate vertices on the surface with a uniform density, so there is no common vertice with the original mesh.

Could you elaborate more on this for a newbie? When will you use what? Are there some cases where one is better than the other? How will it affect the result?

[natowi]

@Vekolb

MeshDecimate will keep vertices that can not be removed without changing the original Mesh boundaries.
Decimated Meshes have a smaller polycount while maintaining the overall Mesh shape.

MeshResampling will recreate the Model to generate a uniform Mesh. Some Edges/Elements may get lost in this process.
Resampled Meshes may be better to modify later on in 3d modelling software.

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