How to transform specific points/vertices and removing the corresponding stretched triangles

[Gabriel0402]

Checklist

• [X] I have searched for similar issues.
• [X] For Python issues, I have tested with the latest development wheel.
• [X] I have checked the release documentation and the latest documentation (for master branch).

My Question

I have a scene with several instances. And I wanted to move some of the instances within the scene. However the translate and transform function apply to all points/vertices in the *.ply file. And If I'm transforming the vertices, the corresponding triangles would be stretched.

For example, before the transformation: After the transformation:

We use the following code to change the coordinates of the vertices: np.asarray(mesh.vertices)[i]+=np.asarray([0.4,1,0])

Is there some way that we can do this transformation while keeping the triangles normal？

[yuecideng]

A possible way is cropping the partial desk mesh out of the whole mesh, and only translate the desk mesh.