Hi Justin,
I've just review the code and yes there is a potential issue when the
projection direction of the overlay (the lookVector varaible in this
code) is co-incident with the main camera's look vector (frustum_axis
in this code).
Catching this case with a check of sideVector.length()< 1.0 is a bit
over zealous, as numerical errror could easily lead to value slightly
less than 1.0 but still have a perfectly valid vector. Something like
sideVector.length()<1e-3 would probably be more appropriate as we only
need to catch cases where the vector is close to 0.0.
Robert.
On 7/3/07, KSpam <[EMAIL PROTECTED]> wrote:
There is a singularity in OverlayNode.cpp in the
traverse_VIEW_DEPENDENT_WITH_ORTHOGRAPHIC_OVERLAY method. This singularity
is evident when frustum_axis (line 1463) approaches lookVector (line 1465).
To resolve this, I added the following code following sideVector.normalize()
(line 1476):
if (sideVector.length() < 1.0)
{
sideVector = osg::Vec3d(1.0, 0.0, 0.0);
}
Is this a reasonable fix?
Thanks,
Justin
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