Custom renderer entity positioning

[PixelRankYT (Noxius)]

1. What do you want to achieve?
   Currently I am making a custom renderer of sorts using raycasts, similar to stuff like the original Doom and Wolfenstein 3D.

2. What is the issue?
   The issue comes from the side of rendering entities, I have no idea how to accurately position them on the X axis of the screen. Currently I got an angle between the entity and the camera, but it only does positive values, which is where the issue resides, since I don’t know if the entity is to the left or right.

3. What solutions have you tried so far?
   I tried looking for a solution online, didn’t find anything.

Here’s the angle/direction code:

local observerLook = (camera.CFrame.LookVector * Vector3.new(1,0,1)).Unit
local targetDirection = ((entities[index].Position * Vector3.new(1,0,1)) - (origin * Vector3.new(1,0,1))).Unit -- direction from observer to target
local angle = math.acos(observerLook:Dot(targetDirection))

The value returned is always positive, so I can’t know if the entity is to the right or left

[Spooce]

Here’s an approach I like to use that abstracts some of the math away. This assumes that origin is the character position.

local entityPos = entities[index].Position
local lookAt = CFrame.lookAt(entityPos, origin, Vector3.yAxis) -- Entity looking at origin
local rX, rY, rZ = lookAt:ToOrientation() -- Get rotational components
local entityCF = CFrame.new(entityPos) * CFrame.Angles(0, rY, 0) -- Rotate about the Y-axis to face origin

[PixelRankYT (Noxius)]

I should have mentioned that the entity is rendered with an ImageLabel, so looking at your code it doesn’t seem like it will work. I need to know the angle so I could position it correctly from left to right of the screen.

[PixelRankYT (Noxius)]

After a bit of tinkering I realized I can use the orientation part of your example and then just subtract the orientation of the camera.