Thread: opengl

Hi all!
I'm still learning OpenGL, but i seem to have stumbled on one little problem along the way. I'm compiling using Bloodshed Dev C++ 4, and using a tutorial from the famous NEHE,
i seem to be able to create nothing but an empty window. ( it's transparent).

So...if anyone wanna tell me what's wrong with the code....




Stef


Discover the XBlue enviornment.
http://www.angelfire.com/my/bahairomania/freegui.html

Thanks guys for taking your time to help. This could mean a lot to me.

Thanks a lot.

Stef

Ok. I fixed the Major bugs about the Device Handle and the PIxel Format Descriptor. I can actually draw things and see them- or at least parts of them. The first time i noticed i was using Translated(..) but then i noticed the tutorial used Translatef(...) .. What could the difference be about.

Also, I added this code to the DrawGLScene function, and when I try to zoom-out on the z coordonate with Translatef
i can't see anything. That is, if exceed -1.0f or 1.0f. So if, I got to 1.1 or -1.1 i see a big black window and no objects. Otherwise, if i leave things alone, i can see only half side of each object...I know this sounds a little crazy, but i need help....

Basically, all i need to know is how to zoom out so i can see both objects fully?

glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity();
glTranslatef(-1.5f, 0.0f, 0.9f);
glBegin(GL_TRIANGLES);
glColor3f(1.0f, 0.0f, 0.0f);
glVertex3f( 0.0f, 1.0f, 0.0f);
glColor3f(0.0f, 1.0f, 0.0f);
glVertex3f( -1.0f,-1.0f, 0.0f);
glColor3f(0.0f, 0.0f, 1.0f);
glVertex3f( 1.0f, -1.0f, 0.0f);
glEnd();

glTranslatef(3.0f, 0.0f, 0.0f);
glColor3f(0.5f,0.5f,1.0f); // Set The Color To Blue One Time Only
glBegin(GL_QUADS); // Start Drawing Quads
glVertex3f(-1.0f, 1.0f, 0.0f); // Left And Up 1 Unit (Top Left)
glVertex3f( 1.0f, 1.0f, 0.0f); // Right And Up 1 Unit (Top Right)
glVertex3f( 1.0f,-1.0f, 0.0f); // Right And Down One Unit (Bottom Right)
glVertex3f(-1.0f,-1.0f, 0.0f); // Left And Down One Unit (Bottom Left)
glEnd();
glPopMatrix();
return TRUE;

Stef

tell me if this works?

Code:

glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity();
glPushMatrix(); // added: pushes matrix otherwise the glPopMatrix call will cause a stack underflow

// Adjusted so it works for me
glTranslatef(-1.5f, 0.0f,-5.0f);

glBegin(GL_TRIANGLES);
    glColor3f(1.0f, 0.0f, 0.0f);
    glVertex3f( 0.0f, 1.0f, 0.0f);
    glColor3f(0.0f, 1.0f, 0.0f);
    glVertex3f( -1.0f,-1.0f, 0.0f);
    glColor3f(0.0f, 0.0f, 1.0f);
    glVertex3f( 1.0f, -1.0f, 0.0f);
glEnd();

glTranslatef(3.0f, 0.0f, 0.0f);
glColor3f(0.5f,0.5f,1.0f); // Set The Color To Blue One Time Only

glBegin(GL_QUADS); // Start Drawing Quads
    glVertex3f(-1.0f, 1.0f, 0.0f); // Left And Up 1 Unit (Top Left)
    glVertex3f( 1.0f, 1.0f, 0.0f); // Right And Up 1 Unit (Top Right)
    glVertex3f( 1.0f,-1.0f, 0.0f); // Right And Down One Unit (Bottom Right)
    glVertex3f(-1.0f,-1.0f, 0.0f); // Left And Down One Unit (Bottom Left)
glEnd();
glPopMatrix();

if not then post your resize code and the GL init code.