-- ScreenSpace -> WorldSpace. Taking a screen height, and a depth to put an object 
-- at, and returning a size of how big that object has to be to appear that size
-- at that depth.

function ScreenSpace.ScreenToWorldByHeightDepth(x, y, screenHeight, depth)
	local aspectRatio = ScreenSpace.AspectRatio()
	local hfactor = math.tan(math.rad(Workspace.CurrentCamera.FieldOfView)/2)
	local wfactor = aspectRatio*hfactor
	local sx, sy = ScreenSpace.ViewSizeX(), ScreenSpace.ViewSizeY()
	--
	local worldHeight = -(screenHeight/sy) * 2 * hfactor * depth
	--
	local xf, yf = x/sx*2 - 1, y/sy*2 - 1
	local xpos = xf * -wfactor * depth
	local ypos = yf *  hfactor * depth
	--
	return Vector3.new(xpos, ypos, depth), worldHeight
end
