Factorio Forums

When a player places a blueprint, the 'on_pre_build' event contains no surface information.

We get the player_index (but player surface can differ from the blueprints) and the map position, which is not enough if we don't know the surface.

The player surface won't differ from the built blueprint. The player surface is directly used to build the blueprint.

Thanks for the reply. I should have tried that. I just assumed it would use the surface the player character was on.