OpenGL Transformations

I've managed to load an image and texture map it. I am now trying to rotate this object. When I rotate it, it looks funny and I'm not sure why.

Here are the relevant lines of code:

Code:

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void initGL(void){
        glEnable(GL_TEXTURE_2D);
        glShadeModel(GL_SMOOTH);
        glClearColor(0.0f,0.0f,0.0f,0.0f);
        glClearDepth(1.0f);
        glEnable(GL_DEPTH_TEST);
        glMatrixMode(GL_PROJECTION);
        glLoadIdentity();
        glOrtho(0,640,480,0,-1,1);
        glMatrixMode(GL_MODELVIEW);
        glLoadIdentity();
}


void drawBox(void){

        glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
        glBindTexture(GL_TEXTURE_2D,tname);

        glPushMatrix();
        glRotatef(rcubex,1.0f,0.0f,0.0f);
//        glRotatef(rcubey,0.0f,1.0f,0.0f);
//        glRotatef(rcubez,0.0f,0.0f,1.0f);
        glBegin(GL_QUADS);

                //front
                glTexCoord2f(0,0);
                glVertex3f(270,190,0);
                glTexCoord2f(1,0);
                glVertex3f(370,190,0);
                glTexCoord2f(1,1);
                glVertex3f(370,290,0);
                glTexCoord2f(0,1);
                glVertex3f(270,290,0);

                //back
                glTexCoord2f(0,0);
                glVertex3f(270,190,100);
                glTexCoord2f(1,0);
                glVertex3f(370,190,100);
                glTexCoord2f(1,1);
                glVertex3f(370,290,100);
                glTexCoord2f(0,1);
                glVertex3f(270,290,100);

                //right
                glTexCoord2f(0,0);
                glVertex3f(370,190,0);
                glTexCoord2f(1,0);
                glVertex3f(370,190,100);
                glTexCoord2f(1,1);
                glVertex3f(370,290,100);
                glTexCoord2f(0,1);
                glVertex3f(370,290,0);

        glEnd();
        glPopMatrix();
        rcubex+= 0.3f;
        rcubey+= 0.2f;
        rcubez+= 0.4f;
}

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I think it might have to do with what is in initGL()

Could you be more specific than "funny"? Blurry textures? Wrong colors? Wrong shape? Missing faces?

I noticed you never set your prespective, a la glFrustrum or equivalent.

Ah, I see it now.

There is a call to set the projection

Code:

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glOrtho(0,640,480,0,-1,1);

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but znear and zfar are way too small to show the whole object; you'll only see the small slice that happens to be between -1 and 1.

...and that will only work if your entire object lies between -1 and 1. This will work fine for 2D where everything can be at z = 0.0f or z = 1.0f and objects are normally on the x/y plane but it will not work for anything else.