Dynamic Widget - Get Scaling Factor posted by Cesium | blueprintUE

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   NodeComment="In order to draw a crisp UI, we need to scale widgets such that 1 pixel in UMG is equivalent to 1 display pixel in the headset. To do this, we first calculate what the pixel density per meter of the headset is, assuming the UI is 1 meter away as a standard reference point. At a distance of 1 meter away, a flat 1-meter-wide line segment in the world takes up 53.1 degrees FOV in the headset. The Meta Quest 2 headset has an angular resolution of 21 pixels per degree. If we multiply these numbers, we get the pixels per meter (again, assuming the UI is a distance of 1 meter away). We can then multiply pixels per meter by 0.01 meters per UE unit to get pixels per UE unit.\r\n\r\nA widget component is drawn in the world such that 1 UMG pixel equals 1 UE unit width. For example, if you draw size value to 500 x 500, you\'ll get a world size of 5m x 5m. We flip the px/UE value to get UE units per pixel, then scale the widget component by this value to ensure that 1 pixel in UMG translates to 1 pixel on the headset display."
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