The spot light contribution to the Meshlab object will disappear entirely, so do the shadows. Only the ground plane still receives a contribution from the spot light. Adding display: none to the directional light will restore the correct lighting from the spot light.
To reproduce, add a directional light to the MeshLab example:
The spot light contribution to the Meshlab object will disappear entirely, so do the shadows. Only the ground plane still receives a contribution from the spot light. Adding
display: none
to the directional light will restore the correct lighting from the spot light.