To change the transparency of voxels in Ursina Python, you can adjust the alpha property of the voxel’s color attribute. The alpha value determines the opacity of the voxel, with 0.0 being completely transparent and 1.0 being fully opaque.

Here’s an example of how to change the transparency of a voxel:

from ursina import *

app = Ursina()

voxel = Voxel()
voxel.color = color.rgb(255, 255, 255, 0.5)  # Set transparency to 0.5

def update():
    voxel.rotation_y += 1

app.run()

In the example above, the color attribute of the voxel is set using the color.rgb() function, which takes the red, green, blue, and alpha values as arguments. By setting the alpha value to 0.5, the voxel will be semi-transparent.

Adjust the alpha value according to your desired level of transparency.