Draw a line on blocks at specific coordinates (1.16X)

[shadeslate]

I have a path finding class, that gives coordinates when called but because i'm very new to forge, games and rendering i have no idea how to implement this (Client side) into the game. 
I don't care if its a line or glowing blocks or something else. I just want an indicator for where i have to go.
My mod has a 1.16 and a 1.8 version, but the 1.16 is more important for me so support in that version would be appreciated.

Thanks in advance

[Draco18s]

This is some really old code, but most of the logic wouldn't have changed as a result of newer minecraft versions, though some of the wrapper classes have.

Basically you just need to find a line between two points (trivial) find a perpendicular line between that one and vertical (or along the camera's view vector), which is a dot product, then use the resulting values to find the four corners of a quad those two lines represent, and add that quad to the render buffer.

https://github.com/Draco18s/HarderStuff/blob/master/src/main/java/com/draco18s/hazards/client/HazardsClientEventHandler.java#L235

[shadeslate]

thank you