Thomas Beer wrote:
Dirk Reiners wrote:
Hi Thomas,
On Sun, 2005-10-30 at 01:04 +0200, Thomas Beer wrote:
Hi!
I just encountered an "unexpected behaviour" kind of problem with
MatrixPerspective:
MatrixPerspective(90.0, 1.0, 0.1, 1000.0) gives
-0.501 0.000 0.000 0.000
0.000 -0.501 0.000 0.000
0.000 0.000 -1.000 -0.200
0.000 0.000 -1.000 0.000
while gluPerspective(90.0, 1.0, 0.1, 1000.0) gives me
1.000 0.000 0.000 0.000
0.000 1.000 0.000 0.000
0.000 0.000 -1.000 -0.200
0.000 0.000 -1.000 0.000
Is this the supposed behaviour of MatrixPerspective?
Yup. ALL OpenSG functions take angles in radians, not degrees. Try
MatrixPerspective(osgdegree2rad(90.0), 1.0, 0.1, 1000.0), that should
fix it.
Hope it helps
Dirk
I know, but the values with deg2rad(90) are worse:
MarixPespective 90:
-0.501 0.000 0.000 0.000
0.000 -0.501 0.000 0.000
0.000 0.000 -1.000 -0.200
0.000 0.000 -1.000 0.000
MarixPespective deg2rad(90):
-0.000 0.000 0.000 0.000
0.000 -0.000 0.000 0.000
0.000 0.000 -1.000 -0.200
0.000 0.000 -1.000 0.000
gluPerspective:
1.000 0.000 0.000 0.000
0.000 1.000 0.000 0.000
0.000 0.000 -1.000 -0.200
0.000 0.000 -1.000 0.000
Any ideas?
Thomas
I had a look into several gluPerspective and alike implementations:
They all take the tan(fov*0.5) where MatrixPerspective takes the whole
tan(fov)!
Thomas
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