VR system with nexuiz

[erroneus]

i know what your thinking, why would anyone want to do that?
well, my reason is a little long to post here, but basicly, i'm trying to build an affordable VR system by means of a head tracking device. (school project) it would work on any platform that can use joystick, mouse, and keyboard. Nexuiz seems to have all 3. (and is open source if i'm not mistaken)
i've taken a look at the wiki and controls, and it seem that the engine has the capability of rotating the camera (tilt with strafe or death), but how could i control it (or add an control) that is from a mouse axis (or joystick)? (specifically the z axis... which i only found out because directX has a z axis for the mouse for some reason)

so, is this possible?

edit: this thread has evolved beyond that of rotating the camera with mouse, see newer posts

[Psychcf]

you mean like in older FPS games? I'm sure it's possible, but I dunno.

[TVR]

Fortunately, such will be easier that camera tilting is fairly trivial; and stereo GL projection is already supported.

Unfortunately, as Nexuiz uses OpenGL, you'll have to code in such support for [1] Determining the pitch, yaw, and roll of such head tracking device [2a] Mapping such movements towards cursor/joystick movement & acceleration OR [2b] Directly translating such movement in Darkplaces to camera movement.

[erroneus]

well i guess it couldn't hurt to provide a little more info as to what i'm doing

i'm using a program called GlovePIE to remap devices onto other devices, so i could use a joystick or such to controll a mouse etc..
in this specific project, i started with a wiimote, but since the wiimote cannot detect yaw, i'm migrating towards the PS3 sixaxis controller.
i've already created a script that converts the angle of pitch into mouse movment that results in looking up or down.
it is actually quite simple, i can do the same with yaw once i get a ps3 controller, tilt/rotation can be controlled this way too, however i couldn't find any console commands or variables that would allow for direct camera controll with the mouse.

any tips on where i could start if i wanted to add my own?

[KadaverJack]

There's support for a cvar called joy_axisroll in vid_sdl.c, but all references are commented out.

[erroneus]

thanks! not sure what i can do, but its a start!

[[-z-]]

This sounds like it could get interesting. Please keep us updated.

edit: http://www.cs.cmu.edu/~johnny/projects/wii/

[erroneus]

well, i wasn't able to get the view to rotate with the mouse, but once i figured out how to compile into a binary, it was pretty easy to remove the // and get the code to work, i modified it a bit, so that holding the joystick position will determin the roll position, (i removed a + and increased sensitivity) problem is though that it is really shakey at the extremes.
other than that, i just have to work on my glovepie script a bit more.

i want to build a map that makes the user cross over an abyss via narrow beam. (using the vr helm) i have to come up with a way to track walking motion from the user and put that into the game. accelerometers could work, but the math involved is a little difficult for me.

[erroneus]

I have a quick demo of what i have been able to do so far, but there is one thing that i hope i can get help with.

on line 293 of vid_sdl.c i changed the code from

Code: Select all

cl.viewangles[2]   += IN_Joysti........
to
cl.viewangles[2]   = IN_Joysti...........

also there was a speed variable at the end of the line that i commented out because it gave me a declaration error when compiling, (i replaced it with an arbitrary number of 200)
anyways, i took out the + so that the view angle would corispond with the position of the joystick (and therefor the positon of the ps3 controller)

what i need help with is that when i am holding the joystick (virtual or real) at a constant value, the camera jitters like crazy, the further i push it, the more jitter there is.
i've managed to fix some of it by removing code that was found in cl_input.c
(commented out line 400

Code: Select all

cl.viewangles[ROLL] = ANGLEMOD(cl.viewangles[ROLL]);

i also took out the bounding code on line 409

Code: Select all

cl.viewangles[ROLL] = bound(-50, cl.viewangles[ROLL], 50);

and that stopped the jitter when the angle is maxed out
any suggestions?

it may help you to know what i'm doing with the VR stuff
if you are a little confused, i've published what i'm doing on my website, i have a video of my customized nexiuz in action too!

http://joelclemens.colinr.ca/stuff.html

[[-z-]]

Nice man, looking real good.