Why OpenGL use in my prog. left coordinate system

OpenGL OpenGL: Basic Coding
1

I wrote program which generate this picture

and the code for axial is
"
glLineWidth(3.0f);
glBegin (GL_LINES);
glColor3f (1.0f, 0.0f, 0.0f); //red green blue
glVertex3f (0.0f, 0.0f,0.0f);
glVertex3f (0.0f, 200.0f,0.0f);

                //red line Y axis
            glColor3f (0.0f, 1.0f, 0.0f);
                glVertex3f (0.0f, 0.0f,0.0f);
                glVertex3f (200.0f, 0.0f,0.0f);

                //green line X axis
            glColor3f (1.0f, 1.0f, 1.0f);
                glVertex3f (0.0f, 0.0f,0.0f);
                glVertex3f (0.0f, 0.0f,200.0f);

                //blue line Z axis
        glEnd ();

"
why it’s looke like left-handle coordinate thus opengl use right coordinate system?

2

hm, perhaps you have multiplied a negative scale onto the matrix stack?

3

I don’t multiplet by negative , but i thing i find solution, look at this site OpenGL Projection Matrix

4

Your picture is ambiguous because it uses no hidden line removal.

You could be below and to the left of the origin, with the Z axis shooting up over your right shoulder (right-handed axes)…

Or you could be up and to the right of the origin, with the white line shooting our and away from your left foot (left-handed axes)…

Unless you have a negation in your lookat transform, I’d suspect the former since OpenGL is right-handed.

Turn on depth test and render some surfaces to remove the ambiguity.