Vector:ToScreen
Description
Returns where on the screen the specified position vector would appear. A related function is gui.ScreenToVector, which converts a 2D coordinate to a 3D direction.
Should be called from a 3D rendering environment or after cam.Start3D or it may not work correctly.
Errors in a render hook can make this value incorrect until the player restarts their game.
cam.Start3D or 3D context cam.Start with non-default parameters incorrectly sets the reference FOV for this function, causing incorrect return values. This can be fixed by creating and ending a default 3D context (cam.Start3D with no arguments).
Returns
Example
Draw some text on certain entities/positions in-world.
hook.Add( "HUDPaint", "ToScreenExample", function()
-- Get a list of all props
local points = ents.FindByClass( "prop_*" )
-- For each prop, draw a marker on screen
for id, ent in pairs( points ) do
local point = ent:GetPos() + ent:OBBCenter() -- Gets the position of the entity, specifically the center
local data2D = point:ToScreen() -- Gets the position of the entity on your screen
-- The position is not visible from our screen, don't draw and continue onto the next prop
if ( not data2D.visible ) then continue end
-- Draw a simple text over where the prop is
draw.SimpleText( "Prop here", "Default", data2D.x, data2D.y, Color( 255, 255, 255 ), TEXT_ALIGN_CENTER, TEXT_ALIGN_CENTER )
end
end )
Output: 
Rust
Steamworks
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