Rerun

Mesh3D

A 3D triangle mesh as specified by its per-mesh and per-vertex properties.

See also archetypes.Asset3D.

If there are multiple archetypes.InstancePoses3D instances logged to the same entity as a mesh, an instance of the mesh will be drawn for each transform.

The viewer draws meshes always two-sided. However, for transparency ordering front faces are assumed to those with counter clockwise triangle winding order (this is the same as in the GLTF specification).

Fields fields

Required required

Optional optional

Can be shown in can-be-shown-in

Examples examples

Simple indexed 3D mesh simple-indexed-3d-mesh

"""Log a simple colored triangle."""

import rerun as rr

rr.init("rerun_example_mesh3d_indexed", spawn=True)

rr.log(
    "triangle",
    rr.Mesh3D(
        vertex_positions=[[0.0, 1.0, 0.0], [1.0, 0.0, 0.0], [0.0, 0.0, 0.0]],
        vertex_normals=[0.0, 0.0, 1.0],
        vertex_colors=[[0, 0, 255], [0, 255, 0], [255, 0, 0]],
        triangle_indices=[2, 1, 0],
    ),
)
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3D mesh with instancing 3d-mesh-with-instancing

"""Log a simple 3D mesh with several instance pose transforms which instantiate the mesh several times and will not affect its children (known as mesh instancing)."""

import rerun as rr

rr.init("rerun_example_mesh3d_instancing", spawn=True)
rr.set_time("frame", sequence=0)

rr.log(
    "shape",
    rr.Mesh3D(
        vertex_positions=[[1, 1, 1], [-1, -1, 1], [-1, 1, -1], [1, -1, -1]],
        triangle_indices=[[0, 2, 1], [0, 3, 1], [0, 3, 2], [1, 3, 2]],
        vertex_colors=[[255, 0, 0], [0, 255, 0], [0, 0, 255], [255, 255, 0]],
    ),
)
# This box will not be affected by its parent's instance poses!
rr.log(
    "shape/box",
    rr.Boxes3D(half_sizes=[[5.0, 5.0, 5.0]]),
)

for i in range(100):
    rr.set_time("frame", sequence=i)
    rr.log(
        "shape",
        rr.InstancePoses3D(
            translations=[[2, 0, 0], [0, 2, 0], [0, -2, 0], [-2, 0, 0]],
            rotation_axis_angles=rr.RotationAxisAngle([0, 0, 1], rr.Angle(deg=i * 2)),
        ),
    )
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Update specific parts of a 3D mesh over time update-specific-parts-of-a-3d-mesh-over-time

"""Log a simple colored triangle, then update its vertices' positions each frame."""

import numpy as np
import rerun as rr

rr.init("rerun_example_mesh3d_partial_updates", spawn=True)

vertex_positions = np.array([[-1.0, 0.0, 0.0], [1.0, 0.0, 0.0], [0.0, 1.0, 0.0]], dtype=np.float32)

# Log the initial state of our triangle
rr.set_time("frame", sequence=0)
rr.log(
    "triangle",
    rr.Mesh3D(
        vertex_positions=vertex_positions,
        vertex_normals=[0.0, 0.0, 1.0],
        vertex_colors=[[255, 0, 0], [0, 255, 0], [0, 0, 255]],
    ),
)

# Only update its vertices' positions each frame:
for i in range(1, 300):
    factor = np.abs(np.sin(i * 0.04))
    rr.set_time("frame", sequence=i)
    rr.log("triangle", rr.Mesh3D.from_fields(vertex_positions=vertex_positions * factor))
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