Logic to reorient all faces.

[Sha11]

I have an mesh file (.off) , faces are not oriented corehently ( i mean some triangles have cyan color while other have "green" ). Is there any way to reorient them ( i mean all triangles shows in "green' color. )

These are below two test cases (.off).

https://justpaste.it/62ajc

https://justpaste.it/5gf7j

[daniel]

Maybe Meshlab has some built-in functions to do that?

[Sha11]

Hmm , I know that , but I want some logic to to this.
Do you know about any open source project that solve this type of problem...

Or any logic..???

[daniel]

Meshlab is open source ;)

Otherwise if you have the mesh topology, you can 'propagate' the direction of a normal from one triangle to its neighbors (with a kind of Minimum Spanning Tree structure for instance) or other front propagation methods.

[Sha11]

Ok I will try this..