Volume plane rendering

Display one 3-D volume layer using the add_volume API and display it as a plane with a simple widget for modifying plane parameters

import napari
import numpy as np
from napari.utils.translations import trans
from skimage import data

viewer = napari.Viewer(ndisplay=3)

# add a volume
blobs = data.binary_blobs(
    length=64, volume_fraction=0.1, n_dim=3
).astype(np.float32)
volume_layer = viewer.add_image(
    blobs, rendering='mip', name='volume', blending='additive', opacity=0.25
)

# add the same volume and render as plane
# plane should be in 'additive' blending mode or depth looks all wrong
plane_parameters = {
    'position': (32, 32, 32),
    'normal': (0, 1, 0),
    'thickness': 10,
}

plane_layer = viewer.add_image(
    blobs,
    rendering='average',
    name='plane',
    depiction='plane',
    blending='additive',
    opacity=0.5,
    plane=plane_parameters
)
viewer.axes.visible = True
viewer.camera.angles = (45, 45, 45)
viewer.camera.zoom = 5
viewer.text_overlay.text = trans._(
    """
shift + click and drag to move the plane
press 'x', 'y' or 'z' to orient the plane along that axis around the cursor
press 'o' to orient the plane normal along the camera view direction
press and hold 'o' then click and drag to make the plane normal follow the camera
"""
)
viewer.text_overlay.visible = True
if __name__ == '__main__':
    napari.run()

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