/* Set the perspective matrix of the pgraphics
* of the _pownerview so that something like _proportionofworldtoshow much of the world
* shows (0.1 would be a tenth of the world, 1.0 would be all of it,
* 2.0 would mean show space aroudn the world so it takes up half the
* view. Not const as stereo viewer flips position temporarily. */
/*This tries to set _znear and _zfar
* so that each of the eight corners of the worldbox is between
* the planes cutting the attitudeTangent() direction at distances of _znear and _zfar from the
* position(). We don't take into account the corners that are behind the viewer. If
* any point is behind or almost behind the viewer pos relative to the
* viewedirection we set _znear to cCritterViewer::MINZNEAR, which is typically 0.1. */
public bool isVisible(cVector3 testpos)
{
/* _foveaproportion lies between 0.0 and 1.0. We say something is visible if it
* appears on the inner foveaproportion central box of the viewer's image screen,
* which is what you see in the view window. */
if (!_perspective)
{
cRealBox2 fovea;
fovea = OrthoViewRect;
fovea = fovea.innerBox((1.0f - _foveaproportion) * fovea.MinSize);
return(fovea.inside(new cVector2(testpos) - new cVector2(_position)));
}
else
{
cVector3 totestpos = (testpos - Position).normalize();
return(Math.Abs(totestpos.angleBetween(AttitudeTangent)) <
_foveaproportion * 0.5f * _fieldofviewangle);
}
}
