How can I do orientation in OpenGL

Check out the orientation page that's the link below this page's in the OpenGL section of the lefthand side links. If you want, send me an email with more detailed description of what you already know how to do and what you need to know.

I've now given the UpX, UpY, UpZ of the gluLookAt as sin(angle),
cos(angle),0 for z-axis orientation. Is this enough for getting orientation
in OpenGL.

>
> I've now given the UpX, UpY, UpZ of the gluLookAt as sin(angle),
>
> cos(angle),0 for z-axis orientation. Is this enough for getting
> orientation
> in OpenGL.

I think that will get you some really strange results if you've tried that. UpX,Y,Z should be something like (0,1,0), and then something like (x + cos(angle), y + 0, z + sin(angle)) and (sin(angle),0,-cos(angle)) for the forwarding looking and right hand vector parameters. x,y,z is the location of the view, make them zero and you'll be able to rotate but not move.

-Luke

Dear Luke,
  Can u give me the details of the forwarding looking and right
hand vector parameters that you have given me. How will I give
the
specifications that you have given, in my program . I have to
give
orientation to an object( say a cone) in the screen and will
gluLookAt
will do it.
Regards
Prakash



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gluLookAt takes three sets of three floats, the first for the location of the eye/camera, the second for the location of whatever the camera is to be pointed at, and the last for the direction of 'up':

So before drawing the cone:

gluLookAt( locX, locY, locZ,
    locX + cos(angle), locY + 0 , locZ + sin(angle),
    0, 1 , 0); /* always be oriented with y as up */

.... draw cone etc.

Now that I look at it, my earlier message was giving you the wrong sets of parameters, but this one should work.