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import yt
import numpy as np
from yt.testing import fake_vr_orientation_test_ds

ds = fake_vr_orientation_test_ds()


    

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# now we do volume rendering
sc = yt.create_scene(ds, field='density')
sc.render()
sc.show(sigma_clip=6.0)


    

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# now we do volume rendering
sc = yt.create_scene(ds, field='density')
# Change transfer function
tf = yt.ColorTransferFunction((np.log10(0.1), np.log10(1.)))
tf.sample_colormap(np.log10(0.9), 0.01, colormap="spectral")
tf.sample_colormap(np.log10(0.8), 0.01, colormap="spectral")
tf.sample_colormap(np.log10(0.6), 0.01, colormap="spectral")
tf.sample_colormap(np.log10(0.2), 0.01, colormap="spectral")
render_source = sc.get_source(0)
render_source.transfer_function = tf


    

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sc.render()
sc.show(sigma_clip=6.0)