Camera Representation in 3D

This visualization is inspired by Blender’s camera visualization. It will show the camera center, a virtual image plane at a desired distance to the camera center, and the top direction of the virtual image plane.

import numpy as np

import pytransform3d.transformations as pt
import pytransform3d.visualizer as pv

cam2world = pt.transform_from_pq([0, 0, 0, np.sqrt(0.5), -np.sqrt(0.5), 0, 0])
# default parameters of a camera in Blender
sensor_size = np.array([0.036, 0.024])
intrinsic_matrix = np.array(
    [
        [0.05, 0, sensor_size[0] / 2.0],
        [0, 0.05, sensor_size[1] / 2.0],
        [0, 0, 1],
    ]
)
virtual_image_distance = 1

fig = pv.Figure()
fig.plot_transform(A2B=cam2world, s=0.2)
fig.plot_camera(
    cam2world=cam2world,
    M=intrinsic_matrix,
    sensor_size=sensor_size,
    virtual_image_distance=virtual_image_distance,
)
if "__file__" in globals():
    fig.show()
else:
    fig.save_image("__open3d_rendered_image.jpg")