as a general hacker with an interest in learning whatever I can, I am also interested in how one would go about making one. it could be doable just onto a plain windshield, right?
> it could be doable just onto a plain windshield, right?
My gut tells me you'd need some kind of reflecting sheet stuck in the windshield or the light would just go through. My guess is the screen in Navdy is actually reflecting light polarized in a specific angle, but I could be completely wrong.
Also, it would be harder because windshields are not planar nor perpendicular to the light source, which distorts the projected image. You'd have to calibrate it constantly, I guess that's why Navdy has a screen.
There's also the law. I believe you can't stick things to the windshield for safety reasons, specially if they occlude light.
It seems the optics might not be that hard: a mini-projector, a mirror (though I don't know why you wouldn't just project the light directly) and somewhere to reflect the light.
