Wrong Dimension

[Peter]

Hi Charles,

Do you have an idea why this happens ?
gluPerspective makes trouble with Dimensions. 

At first, I thought that is a driver problem and installed the driver new.
Now runs gluPerspective, but with weird dimensions   



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[Charles Pegge]

Hi Peter,
I have not had a chance to try your direct Frustum perspective yet but gluperspective is what I have always used.

In portViewer1 and PortViewer2 I use both orthographic (for wire frame) and perspective projections.

The matrix mode must be in GL_PROJECTION and glLoadIdentity is used to initialise the matrix before applying perspective.

Your "aspect" is not working. I refresh mine from the viewport or client rect before each  frame.

Code: OxygenBasic

1.  
2.   '---------------------
3.  sub orthopersp(long p)
4.   '=====================
5.  '
6.  double m,n
7.   n=orthosize
8.   m=n*aspect
9.   '
10.  if p then
11.     glOrtho  -m, m, -n, n, 1.0, 100.0 'left right bottom top near far
12.  else
13.     gluPerspective 45.0, aspect, 1, 100.0 'viewAngle,aspect,near,far
14.  end if
15.   end sub
16.   '
17.  '------------------------
18.  sub SetProjection(long p)
19.   '========================
20.  '
21.  glMatrixMode GL_PROJECTION
22.   glLoadIdentity
23.   orthopersp(p)
24.   glMatrixMode GL_MODELVIEW
25.   glLoadIdentity
26.   end sub
27.  

Charles

[Peter]

Hi Charles,

No changes here.

I ask me why my hWnd have got a single value instead of a long value.
hWnd = 59082.0000000016

Aspect works.  A direct value has the same effect .  [1.3333333]

Now I am trying an ATI card.

[Charles Pegge]

Ah that is interesting!. After initialising the screen / opengl pixel and also fonts, it is usually necessary to do finit, since some of these OS functions leave the FPU in a mess. The fpu is used for converting all numbers to Ascii. And this shows up when using print.

Charles