HI Andrey,
I'm rather confused about what you are trying to do, you question
seems rather mixed up. Could you take a step back and explain at a
higher level what you are trying to achieve and we can then point you
in the right direction of how to achieve.
Robert.
On 9 March 2012 08:29, Andrey Ibe <xry...@gmail.com> wrote:
> Hi,
>
> i am trying to get eyePosition and direction, more precisely, the direction
> of a ray for the purpose of ray tracing.
>
> this is what i am doing:
>
> Code:
> const osg::Vec3d collisionPoint = intersection.getWorldIntersectPoint();
> ...
> osg::Vec3d eyeDirection = collisionPoint - _tracer->getEye();
> eyeDirection.normalize();
>
>
> where the _tracer->getEye() method returns the position of the eye (computed
> once for a frame):
> Code:
>
> if (!_eye_set) {
> osg::Vec3d center, up;
> getCamera()->getViewMatrixAsLookAt(_eye, center, up);
> _eye_set = true;
> }
>
>
> i am not sure whether this is the correct way to get the eye
> position/direction. i was thinking there has to be a way to get the direction
> from an intersection itself, but i am not confident using the start/end
> points (transforming them into appropriate coordinates) considering i create
> the rays (line segment intersectors) in WINDOW and also MODEL coordinate
> frames.
>
> can anyone tell me whether my method is correct or i should rather try
> getting the start/end points from the intersector, transforming them and this
> way getting the ray (==eye) direction ?
>
> Thank you!
>
> Cheers,
> Andrey[/code]
>
> ------------------
> Read this topic online here:
> http://forum.openscenegraph.org/viewtopic.php?p=46123#46123
>
>
>
>
>
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