Change the material properties

materials are PBR you can update albedo, roughness, metallic, reflectance and emissive parameters

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')

Get the list of materials of an asset

asset.material_names()

['/ShaderBall/mtl/BallMaterial', '/ShaderBall/mtl/BaseMaterial']

material = asset.material('/ShaderBall/mtl/BallMaterial')
material

<ipyanimlab.render.material.Material at 0x21439166860>

Play with the material

def render(albedo_red, albedo_green, albedo_blue, roughness, metallic, reflectance, emissive):

    # update material
    material.set_albedo(np.array([albedo_red, albedo_green, albedo_blue], dtype=np.float32))
    material.set_roughness(roughness)
    material.set_metallic(metallic)
    material.set_reflectance(reflectance)
    material.set_emissive(emissive)

    # 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,
    albedo_red = widgets.FloatSlider(min=0, max=1, value=1),
    albedo_green = widgets.FloatSlider(min=0, max=1, value=1),
    albedo_blue = widgets.FloatSlider(min=0, max=1, value=1),
    roughness = widgets.FloatSlider(min=0, max=1, value=0, step=0.01),
    metallic = widgets.FloatSlider(min=0, max=1, value=0, step=0.01),
    reflectance = widgets.FloatSlider(min=0, max=1, value=0, step=0.01),
    emissive = widgets.FloatSlider(min=0, max=1, value=0, step=0.01)
)

# show the viewer
viewer