Flipping all mesh normals in the positive direction

[aseglorstw]

Could you please advise on how to flip the normals of a mesh using your Python library?

import meshlib.mrmeshpy as mr

mesh = mr.loadMesh(path_to_mesh)) 

In my case, the mesh represents an open surface, such as terrain:

I need the normals to be oriented in the following way:

Thank you in advance for your reply and time.

[Grantim]

Hello!

We have flipOrientation function to do it:

import meshlib.mrmeshpy as mr

mesh = mr.loadMesh(path_to_mesh)) 

# check if it is needed to flip
avgNorm = mr.Vector3f()
for v in mesh.topology.getValidVerts():
    avgNorm = avgNorm + mesh.normal(v)

avgNorm = avgNorm / mesh.topology.getValidVerts().count()
if ( mr.dot( avgNorm, mr.Vector3f(0,0,1) ) < 0 ): # assume that you want your normals to look in positive Z direction
    mesh.topology.flipOrientation() # flip all normals

[aseglorstw]

Thank you ! I couldn't find full documentation for your python library. Can you send it to me or is it still in progress ?

[Grantim]

Actually we try to keep our python module synchronized with c++ library, so c++ documentation should match python documentation in most cases, please have a look at this page: https://doc.meshinspector.com/PythonCodeExamples.html

Also please note that you can find a lot of useful comments like this:

import meshlib.mrmeshpy as mr
help( mr ) # or you can call help on individual functions or classes