Fix transform (non identity) use in creation.camera_marker

[wkentaro]

Before

After

Code (includes internal)

import numpy as np
import trimesh


cad_file = '/home/wkentaro/Documents/trimesh/models/fuze.obj'

eyes = uniform_points_on_sphere(5, radius=0.5)
targets = np.full(eyes.shape, (0, 0, 0), dtype=float)
T_world2cam = np.array([
    look_at(eye, target)
    for eye, target in zip(eyes, targets)
])

# -----------------------------------------------------------------------------

scene = trimesh.Scene()

geom = trimesh.load(str(cad_file))
geom.visual = geom.visual.to_color()
scene.add_geometry(geom)

scene.camera.resolution = (640, 480)
scene.camera.fov = (60, 45)

for transform in T_world2cam:
    scene.camera.transform = transform
    geom = trimesh.creation.camera_marker(scene.camera, marker_height=0.1)
    scene.add_geometry(geom)

    geom = trimesh.creation.axis(0.01)
    geom.apply_transform(transform)
    scene.add_geometry(geom)

scene.set_camera()

scene.show()

[coveralls]

Coverage decreased (-0.07%) to 84.109% when pulling 4e810b0 on wkentaro:fix_creation_camera_marker into f439e70 on mikedh:master.

[mikedh]

Looks great, thanks! Is there any way we could unit test this? If not no worries, I'll just merge.