Is there any API like getCenter() in OpenGL which I can get the center Translation Matrix of Mesh 3d-model?

[yougrianes]

I find that some mesh models don't put there models in their origin of coordinates, in 3d, T = (0, 0, 0) , so I need to get the translation matrix to rectify them. or whether if there are some methods or functions can already do that?

And, does the class mesh has inner function or method to rotate and change the pose of the 3-d model around the center? seems not in api-doc : https://pytorch3d.readthedocs.io/en/latest/modules/structures.html

[bottler]

You can get the axis-aligned bounding box of a mesh with .get_bounding_boxes() and take the mean (over the last dimension)? Is that what you mean by center? Or you could average all the vertices in a mesh?

You can rotate around the "center" by translating so the center goes to the origin, rotating, and undoing the translation. The code in transform3d.py can do these things.

[yougrianes]

You can get the axis-aligned bounding box of a mesh with .get_bounding_boxes() and take the mean (over the last dimension)? Is that what you mean by center? Or you could average all the vertices in a mesh?

You can rotate around the "center" by translating so the center goes to the origin, rotating, and undoing the translation. The code in transform3d.py can do these things.

Hummm I some how get lost in the api-doc, perhaps ... That's a nice way to solve my problem!
I had a try just now and it's useful to me :-> tks

[yougrianes]

I just find that there is already a tutorial about how to scale-normalize and center the target mesh in here.

# We scale normalize and center the target mesh to fit in a sphere of radius 1 centered at (0,0,0). 
# (scale, center) will be used to bring the predicted mesh to its original center and scale
# Note that normalizing the target mesh, speeds up the optimization but is not necessary!
center = verts.mean(0)
verts = verts - center
scale = max(verts.abs().max(0)[0])
verts = verts / scale

# We construct a Meshes structure for the target mesh
trg_mesh = Meshes(verts=[verts], faces=[faces_idx])