Nanome plugin code to load a 3D mesh

NanomeMesh.py

import nanome
from nanome.util import Color, Logs, Vector3
from nanome.api import shapes
import numpy as np
import open3d as o3d

class OBJLoader(nanome.PluginInstance):
    def start(self):
        path = "mypath.obj"

        #Nanome plugin mesh
        mesh = shapes.Mesh()
        mesh.uv = []
        mesh.colors = []

        #Load a mesh
        o3dmesh = o3d.io.read_triangle_mesh(path)
        #Center the mesh
        o3dmesh.translate(-o3dmesh.get_center())

        #Compute normals if needed
        if not o3dmesh.has_vertex_normals():            
            o3dmesh.compute_vertex_normals()

        if o3dmesh.has_vertex_colors():
            for c in o3dmesh.vertex_colors:
                mesh.colors += [c[0], c[1], c[2], 1.0]

        if o3dmesh.has_triangle_uvs():
            mesh.uv = np.asarray(o3dmesh.triangle_uvs).flatten()

        mesh.vertices = np.asarray(o3dmesh.vertices).flatten()
        #mesh normals can be recomputed by Nanome if the array is empty
        mesh.normals = np.asarray(o3dmesh.vertex_normals).flatten()
        mesh.triangles = np.asarray(o3dmesh.triangles).flatten()

        #Attach the mesh to the workspace, it could also be attached to an atom
        mesh.anchors[0].anchor_type = nanome.util.enums.ShapeAnchorType.Workspace
        mesh.anchors[0].position = nanome.util.Vector3(0, 0, 0)
        mesh.color = nanome.util.Color(255, 255, 255, 255)

        if len(mesh.uv)/2 < len(mesh.vertices) / 3:
            mesh.uv = np.repeat([0.0, 0.0], len(mesh.vertices) / 3)
        if len(mesh.colors)/4 < len(mesh.vertices) / 3:
            mesh.colors = np.repeat([1.0, 1.0, 1.0, 1.0], len(mesh.vertices) / 3)

        #Send mesh to Nanome
        mesh.upload()