Change the time of day

We can call the set_time_of_day method on the viewer to change the time between dawn (0) to noon (60)

import numpy as np
from ipywidgets import widgets, interact, interactive

import ipyanimlab as lab
viewer = lab.Viewer(shadow_quality=lab.ShadowQuality.HIGH, move_speed=5, width=800, height=600)

Load the USD Asset

As static asset the ShaderBall is accessible directly from internal resources

asset = viewer.import_usd_asset('ShaderBall')

Interact with the time of day

def render(time_of_day):

    #the time between dawn (0) to noon (60)
    viewer.set_time_of_day(time_of_day)

    # start the rendering of the shadow
    viewer.begin_shadow()
    # render the asset at default position in the shadow
    viewer.draw(asset)
    # end the shadow
    viewer.end_shadow()

    # start the rendering of the scene
    viewer.begin_display()
    # render the default ground
    viewer.draw_ground()
    # render the asset at default position
    viewer.draw(asset)
    # display the image
    viewer.end_display()

    # send all the command to webgl
    viewer.execute_commands()

interact(
    render,
    time_of_day=widgets.IntSlider(min=0, max=60, value=10)
)

# show the viewer
viewer