see, the thing is that the plane I am drawing on IS z=0 so I don't know what's going wrong...

right, Ive tried using zaphos's code, and got slightly better results.

I can now see that the opengl coordinate is being affected by the value fed in, however, by miniscule amounts.

also, I get a z value of 147, even though the one I put in is 0.

As far as I'm aware I'm using perspective view, however I do have everything on the same plane...

I've tried putting in the top left and bottom right values for my window (when in fullscreen these are 640,512 and -640,-512 respectively) however I get the same results.

thanks for your help so far guys!

yes, yes I am, however it still returns strange results

no, it is too good to be true, when I use it I get the same value EVERY TIME, that of the centre of the screen, no matter what numbers I put into it

heres my code:

Code:

void GetPos(int x, int y)
{
GLint viewport[4];
GLdouble modelview[16];
GLdouble projection[16];
GLfloat winX, winY, winZ;
GLdouble posX, posY, posZ;
glGetDoublev( GL_MODELVIEW_MATRIX, modelview );
glGetDoublev( GL_PROJECTION_MATRIX, projection );
glGetIntegerv( GL_VIEWPORT, viewport );
winX = (float)x;
winY = (float)viewport[3]- (float)y;
winZ = 0.0;

gluUnProject( winX, winY, winZ, modelview, projection, viewport, &posX, &posY, &posZ);

        printf("X:%f Y:%f\n",posX,posY);
}

@Ivan
That looks almost perfect for what I want to do, pets hope it's not to good to be true!

Yes, I looked into that too, however all I really need is a way of turning the coordinates of the mouse in the window into an x,y coordinate at z=0

Thank you, I'll try this when I get a chance.
Thanks!

Hey, I'm doing a game using glut and OpenGL and I need a way of finding the size of the area I am viewing in OpenGL coordinates so I can aim correctly with a mouse. I plan on having a character moving around a 2d world with the camera following him and need some way of figuring out the size of the are I am looking at at a certain z axis position so that I can then calculate where the player is aiming with his mouse.

Thanks In advance!

(btw I am writing this in c++)
 

hmm, wont run for me, says "not a valid win32 application"

(also, I'm assuming the graphics are place holder, as I KNOW that the sprite of the knight with the sword is a warhammer 40,000 space marine with chainsaw, and thus not your own art)

Hmmm, I like the sound of kreisis 271. even if it is a pun it's quite a clever one
Thanks guys!

My mistake, sorry. I assumed that that was the problem (or a similar one) that I had encountered that when sending an early buld of somthing I made to a freind, and it was fixed   by building in release mode

my mistake

Hey I'm in the process of making a platforming, physics based shooter based around the idea of a malfunction in a robotics research lab (a little cliched I know) with all the robots gaining self conciousness, and you (An unaffected robot) being sent in to clean up. It's still in the planning stages, however I think that a good name would help shape the overall direction in the game. I was wondering if you guys had any suggestions for names or critiques for the ones I've already thought up.

(btw, I haven't checked any of theese for dupes, so if there are games with the same name, sorry!)
-Machinations
-Kreis (the protagonist is a circular robot, and kreis is German for circle)
-271 (the facility's reference number)

any ideas?

Hey, that's built with box2d isint it? I remember it from their forum.
Looks pretty fun, I'll have to check it out when I get a chance...

You shouldn't need to install the redistributable if you have built it in release configuration (assuming if course thAt you are using Microsoft visual c++)