End point for line tracing

Hello,

I am trying to get first person shooting working using stereoscope.
I am rendering the world to a texture and as you can see the world space is above the texture.
The crosshair is 2D, while I want to convert the crosshair’s direction to the 3D world space. I’m using Line Trace by channel. How do I set the End point for the Line trace? My calculations are going wrong.

Hi!

If you want to set the length of the Line Trace, you can use this: