For background: I'm running my app interactively (i.e. non-blocking) from an ipython session and I was trying set pick_write=True while working with the scene.

For the minimal reproducer, I thought you would prefer a stand-alone script and it turns out the issue only appears when trying to set pick_write=True after the first renderer.render().

# Initialise the event loop
import pygfx as gfx
from wgpu.gui.auto import WgpuCanvas, run

canvas = WgpuCanvas()
renderer = gfx.renderers.WgpuRenderer(canvas)
scene = gfx.Scene()

# Initialize with pick_write=False
cube = gfx.Mesh(
    gfx.box_geometry(200, 200, 200),
    gfx.MeshBasicMaterial(pick_write=False),
)
scene.add(cube)

def on_hover(event):
   print("Hovering over object:", event.pick_info["world_object"])

scene.add_event_handler(on_hover, "pointer_move")

camera = gfx.PerspectiveCamera(70, 16 / 9)
camera.show_object(scene)

controller = gfx.TrackballController(camera, register_events=renderer)

def animate():    
    renderer.render(scene, camera)    
    canvas.request_draw()
    # Setting pick_write=True after the first renderer.render() has no effect
    cube.material.pick_write = True
    
if __name__ == "__main__":    
    canvas.request_draw(animate)
    run()

Hope this is helpful.

Uh oh!

Make it possible to dynamically change material.pick_write #720

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