About projecting world coordinates onto the screen and converting to screen 2D coordinates

If you use Project world, you will see a coordinate error at some resolution.

For example, I set the UMG resolution to 1280*720, but his (1280,720) coordinates are not on the edge of the lower right corner of UMG, that is, the UMG design frame is not 1280*720.

This is because of the Ue4 resolution scaling mechanism, you can see the screen resolution and the options to fill the screen in UMG design mode, I think this is related to the player's screen resolution. There are relevant zoom options in the settings in the lower right corner. The default is shortest Side.

So this time we need to use Project world location to Widget postion

About projecting world coordinates onto the screen and converting to screen 2D coordinates