public override Frustum.VISIBILTY GetVisibility(TerrainNode t, Box3d localBox)
{
Vector3d2[] deformedBox = new Vector3d2[4];
deformedBox[0] = LocalToDeformed(new Vector3d2(localBox.xmin, localBox.ymin, localBox.zmin));
deformedBox[1] = LocalToDeformed(new Vector3d2(localBox.xmax, localBox.ymin, localBox.zmin));
deformedBox[2] = LocalToDeformed(new Vector3d2(localBox.xmax, localBox.ymax, localBox.zmin));
deformedBox[3] = LocalToDeformed(new Vector3d2(localBox.xmin, localBox.ymax, localBox.zmin));
double a = (localBox.zmax + R) / (localBox.zmin + R);
double dx = (localBox.xmax - localBox.xmin) / 2 * a;
double dy = (localBox.ymax - localBox.ymin) / 2 * a;
double dz = localBox.zmax + R;
double f = Math.Sqrt(dx * dx + dy * dy + dz * dz) / (localBox.zmin + R);
Vector4d[] deformedFrustumPlanes = t.GetDeformedFrustumPlanes();
Frustum.VISIBILTY v0 = GetVisibility(deformedFrustumPlanes[0], deformedBox, f);
if (v0 == Frustum.VISIBILTY.INVISIBLE)
{
return(Frustum.VISIBILTY.INVISIBLE);
}
Frustum.VISIBILTY v1 = GetVisibility(deformedFrustumPlanes[1], deformedBox, f);
if (v1 == Frustum.VISIBILTY.INVISIBLE)
{
return(Frustum.VISIBILTY.INVISIBLE);
}
Frustum.VISIBILTY v2 = GetVisibility(deformedFrustumPlanes[2], deformedBox, f);
if (v2 == Frustum.VISIBILTY.INVISIBLE)
{
return(Frustum.VISIBILTY.INVISIBLE);
}
Frustum.VISIBILTY v3 = GetVisibility(deformedFrustumPlanes[3], deformedBox, f);
if (v3 == Frustum.VISIBILTY.INVISIBLE)
{
return(Frustum.VISIBILTY.INVISIBLE);
}
Frustum.VISIBILTY v4 = GetVisibility(deformedFrustumPlanes[4], deformedBox, f);
if (v4 == Frustum.VISIBILTY.INVISIBLE)
{
return(Frustum.VISIBILTY.INVISIBLE);
}
Vector3d2 c = t.GetDeformedCameraPos();
double lSq = c.SqrMagnitude();
double rm = R + Math.Min(0.0, localBox.zmin);
double rM = R + localBox.zmax;
double rmSq = rm * rm;
double rMSq = rM * rM;
Vector4d farPlane = new Vector4d(c.x, c.y, c.z, Math.Sqrt((lSq - rmSq) * (rMSq - rmSq)) - rmSq);
Frustum.VISIBILTY v5 = GetVisibility(farPlane, deformedBox, f);
if (v5 == Frustum.VISIBILTY.INVISIBLE)
{
return(Frustum.VISIBILTY.INVISIBLE);
}
if (v0 == Frustum.VISIBILTY.FULLY && v1 == Frustum.VISIBILTY.FULLY &&
v2 == Frustum.VISIBILTY.FULLY && v3 == Frustum.VISIBILTY.FULLY &&
v4 == Frustum.VISIBILTY.FULLY && v5 == Frustum.VISIBILTY.FULLY)
{
return(Frustum.VISIBILTY.FULLY);
}
return(Frustum.VISIBILTY.PARTIALLY);
}
