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- """Custom color and transparency maps for Volumes"""
- from vedo import Volume, dataurl, show
- from vedo.pyplot import CornerHistogram
- # Build a Volume object.
- # A set of color/transparency values - of any length - can be passed
- # to define the transfer function in the range of the scalar.
- # E.g.: setting alpha=[0, 0, 0, 1, 0, 0, 0] would make visible
- # only voxels with value close to center of the range (see histogram).
- vol = Volume(dataurl + "embryo.slc")
- vol.color(
- [
- (0, "green"),
- (49, "green"),
- (50, "blue"),
- (109, "blue"),
- (110, "red"),
- (180, "red"),
- ]
- )
- # vol.mode('max-projection')
- vol.alpha([0.0, 1.0])
- vol.alpha_unit(8) # absorption unit, higher factors = higher transparency
- vol.add_scalarbar3d(title="color:dot:alpha transfer function", c="k")
- # substitute scalarbar3d to a 2d scalarbar
- vol.scalarbar = vol.scalarbar.clone2d("center-right", 0.2)
- ch = CornerHistogram(vol, logscale=True, pos="bottom-left")
- # show both Volume and Mesh
- show(vol, ch, __doc__, axes=1, zoom=1.2).close()
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