General Category > Unofficial F/A-18 Acceleration Pack board

Collimated HUD

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neutrino:
Seems to me you forgot your flaps, but nice video anyway, quite realistic ;)

markturner:
Apologies in advance for the stupid question, but I thought that the HUD mod that came out recently was a collimated HUD ? ( Most of that discussion is somewhat over my head I am afraid, but if I understand , it s the method of achieving it thats being discussed, not actually being able to do it? )

cheers, Mark

Orion:
I think it's collimated for the default viewpoint, but if you use the Ctrl Shift Enter Backspace keyboard commands, FreeTrack or TrackIR to shift the viewpoint, it won't be anymore.

neutrino:
There are two terms here that get mixed up a little - one is CONFORMAL and the other is COLLIMATED. The HUD can be conformal but not collimated. Conformal is when the HUD symbology properly corresponds to the outside world - the horizon bar sits on the horizon and the velocity vector shows the direction you are flying relative to the outside world. Collimated is when the HUD symbology is always conformal regardless of where your viewpoint is at the moment. So if you have TrackIR and shift your head left - the symbology moves to the left and remains conformal to the outside world. Currently the HUD mod is only conformal at the default view point, which means that as the aircraft accelerates and your head moves naturally forward or left/right - the HUD symbology loses correlation (conformality) with the outside world, in other words it is fixed relative to the aircraft. Sludge tries to find a way to collimate the HUD. Some aircraft already have collimated HUDs such as the Aerosoft F-16, the IRIS F-16D, Dino's F-35, Lotus L-39. Some years ago HUDs were not even conformal and Scott Printz came up with a freeware HUD that was conformal and that was a big achievement. The push now is for collimation, but the method we use requires a specific change in the aircraft model. In real aircraft the HUD symbology is projected into infinity and that achieves the effect of collimation.

Paddles:
Yet another quick test...  :)
This time I wanted to test two HUDs - on the Accel Hornet and on Dino's Tomcat - and see if my 'shifting plane' approach is feasible.



No joy... I have to admit that this approach won't work. The plane is too close to the eyepoint and moving/shifting the symbology would change nothing in the pilot's perception of it as being a distant object. The symbology appears to be more than 200 feet in front of the aircraft (http://www.rockwellcollins.com/products/cs/at/avionics-systems/head-up-displays/system-overview/hud-basics/index.html). So, the only acceptable way to make a collimated/conformal HUD is to add to the aircraft model a distant plane (or something) upon which the symbology will be projected. Until that I'll have to fly with my Freetrack set as a 2DoF device. Period.  8)

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