Load Open3D Mesh

Demonstrates loading mesh models from open3d.

Warning

An external model is needed to run this example.

To run this example, you need a model from the source repo’s example folder. If you are running this example from a local copy of the code (dev install) no further actions are needed. Otherwise, you may have to replace the path below to point to the location of the model.

import os
from pathlib import Path
from importlib.util import find_spec

if not find_spec("open3d"):
    raise ImportError(
        "The `open3d` library is required for this example: pip install open3d"
    )

import open3d.visualization
from open3d.cpu.pybind.visualization.rendering import TriangleMeshModel

try:
    # modify this line if your model is located elsewhere
    model_dir = Path(__file__).parents[1] / "data"
except NameError:
    # compatibility with sphinx-gallery
    model_dir = Path(os.getcwd()).parent / "data"

Once the path is set correctly, you can use the model as follows:

from open3d import io
import pygfx as gfx

# load helmet model with open3d
helmet: TriangleMeshModel = io.read_triangle_model(
    str(model_dir / "DamagedHelmet/glTF/DamagedHelmet.gltf")
)

# extract helmet infos
helmet_mesh_info: TriangleMeshModel.MeshInfo = helmet.meshes[0]
helmet_mesh: open3d.geometry.TriangleMesh = helmet_mesh_info.mesh
helmet_material: open3d.visualization.Material = helmet.materials[
    helmet_mesh_info.material_idx
]

material = gfx.materials.material_from_open3d(helmet_material)

# create scene
scene = gfx.Scene()
scene.add(gfx.AmbientLight(), gfx.DirectionalLight())

# construct helmet mesh object
mesh = gfx.Mesh(
    gfx.geometries.geometry_from_open3d(helmet_mesh),
    material,
)

# or use alternative helper method for simplified TriangleMeshModel loading
mesh2 = gfx.Group()
for m in gfx.utils.load.meshes_from_open3d(helmet):
    mesh2.add(m)

mesh2.world.position = (2, 0, 0)

scene.add(mesh)
scene.add(mesh2)

if __name__ == "__main__":
    disp = gfx.Display()
    disp.show(scene, up=(0, 1, 0))

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