Resolved Convert position from one camera's perspective to another?

Hi,

I have two cameras where one is responsible for all the world objects (MainCam), and the other is responsible for the first-person objects (FPCam). The MainCam has a different fov from the FPCam, but both cameras have the same position. My problem is that I want to draw a line that starts from a position on a first-person object and ends on a position of a world object using a line renderer. Currently the line renderer is rendered by the MainCam. But depending on the MainCam fov, the start position "moves" away from the first-person object. I am looking for a way to adjust the start position so that when the MainCam projection is applied to the line renderer, the start position is where the first-person object is.

Thank you for the help!

 

The camera component has several functions for converting from world space to viewport or screen (pixel) space, or vice versa. Use those to convert the starting position of the beam from world space to the viewport position of the first person camera, then convert that viewport position back to world space in the main camera.

https://docs.unity3d.com/ScriptReference/Camera.WorldToViewportPoint.html
https://docs.unity3d.com/ScriptReference/Camera.ViewportToWorldPoint.html

 

Yep, that worked like a charm. Thank you! Sadly, I tried something like this before posting but had it flipped where I was doing:

Code (CSharp):

1. private Vector3 ConvertPoint(Vector3 point) {
2.     return fpCam.ViewportToWorldPoint(mainCam.WorldToViewportPoint(point));
3. }

Instead of the correct thing:

Code (CSharp):

1. private Vector3 ConvertPoint(Vector3 point) {
2.     return mainCam.ViewportToWorldPoint(fpCam.WorldToViewportPoint(point));
3. }

And for some reason I thought I tried flipping it but I guess I did not. Anyways, hopefully this can help someone in the future.