public static bool CalcClippingPlanes(ViewportInfo vp, ClippingInfo m_Clipping)
{
// Initialize m_Clipping frustum info.
// (left,right,top,bottom are not used but should be initialized).
//const ON::view_projection projection = vp.Projection();
vp.GetFrustum(out m_Clipping.left,
out m_Clipping.right,
out m_Clipping.bottom,
out m_Clipping.top,
out m_Clipping.bbox_near,
out m_Clipping.bbox_far);
m_Clipping.min_near_dist = 0.000100;
m_Clipping.min_near_over_far = 0.000100;
m_Clipping.target_dist = (vp.CameraLocation - vp.TargetPoint)*vp.CameraZ;
// Call virtual function that looks at m_Clipping.bbox and sets
// m_Clipping.bbox_near and m_Clipping.bbox_far
if ( !CalcClippingPlanesInternal( vp, m_Clipping ) )
return false;
if ( double.IsNaN(m_Clipping.bbox_far)
|| double.IsNaN(m_Clipping.bbox_near)
|| m_Clipping.bbox_far <= m_Clipping.bbox_near
|| (vp.IsPerspectiveProjection && m_Clipping.bbox_near <= 1.0e-12)
|| (vp.IsPerspectiveProjection && m_Clipping.bbox_far > 1.0e16*m_Clipping.bbox_near)
|| m_Clipping.bbox_near > 1.0e30
|| m_Clipping.bbox_far > 1.0e30
)
{
// Restore settings to something more sane
vp.GetFrustum(out m_Clipping.left,
out m_Clipping.right,
out m_Clipping.bottom,
out m_Clipping.top,
out m_Clipping.bbox_near,
out m_Clipping.bbox_far);
m_Clipping.min_near_dist = 0.000100;
m_Clipping.min_near_over_far = 0.000100;
m_Clipping.target_dist = (vp.CameraLocation - vp.TargetPoint)*vp.CameraZ;
}
return true;
}
public static bool SetupFrustum(ViewportInfo vp, ClippingInfo clipping)
{
double n0 = vp.FrustumNear;
double f0 = vp.FrustumFar;
// Because picking relies heavily on the projection, we first set the
// viewport frustum here, capture and save it, then let the conduits
// do what ever they want with it...eventually the viewport will be put
// back to the captured state before leaving the pipeline...
ClippingInfo m_SavedClipping = clipping;
vp.SetFrustumNearFar(clipping.bbox_near, clipping.bbox_far,
clipping.min_near_dist, clipping.min_near_over_far,
clipping.target_dist
);
vp.GetFrustum(out m_SavedClipping.left,
out m_SavedClipping.right,
out m_SavedClipping.bottom,
out m_SavedClipping.top,
out m_SavedClipping.bbox_near,
out m_SavedClipping.bbox_far);
// Next, set the values that the pipeline will actually use...
if (!(AdjustFrustum(vp, clipping)))
return false;
return true;
}
