Please help me.

OpenGL OpenGL: Basic Coding
1

I made a SDI application using OpenGL.
and I have a problem.

I used orthographic parallel viewing volume.

glOrtho (-l,l,-b,b,ne,fa);

l, b, ne, fa are appropriate variables…

and then I’m redering the model.

the blue line’s Z position is 1.0
and yellow block’s Z positon is 0.0

when I use mouse wheel, the picture is scaled.

glScaled(scale*count_scale, scale*count_scale, scale*count_scale);

I want Fig.1
but if the scale is small, Fig.2 is appread.

what is the problem?

thanks for your attention.

2

If its 3D object what you are rendering paste the complete code where you are positioning the objects, if its only 2D try not scaling along Z Axis.