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What is the relationship between screenspace, viewport, world, and window positions? What is their relationship to DPI?

Can't seem to find how the four coordinates relate to one another. Have had problems that's solve by multiply a coordinate by the dpi and but still is a bit confused

For example, I want to check if an actor is in a selection box created from two points from Start mouse position and end mouse position

I deproject actors world position to screenspace. Now I need to figure out how to convert screenspace to mouse position which isn't in screenspace... Or vice versa

Product Version: UE 4.15
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asked May 12 '17 at 08:02 PM in C++ Programming

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Espii77
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