/// <summary>
/// Use when one plane is known to be intersecting
/// </summary>
/// <param name="plane1">The plane known to be intersecting</param>
/// <param name="plane2">The second plane</param>
/// <param name="targetY">The target Y position of the ground plane</param>
/// <returns></returns>
private static ViewClipShape FromKnownIntersection(ClipPlane plane1, ClipPlane plane2, float targetY)
{
Vector3 intersect1, intersect2, intersect3, intersect4 = Vector3.Zero;
Vector3 intersect5 = Vector3.Zero, intersect6 = Vector3.Zero;
int pointCount;
if (plane1.Point1.Y > targetY) //point 1 is above the plane
{
if (plane1.Point2.Y > targetY) //point 2 is above the plane
{
if (plane1.Point3.Y > targetY) //point 3 is above the plane, point 4 has to be below - points 1, 2 & 3 above
{
intersect1 = Utils.LinePointFromKnownY(plane1.Point1, plane1.Point4, targetY);
intersect2 = Utils.LinePointFromKnownY(plane1.Point3, plane1.Point4, targetY);
pointCount = 3;
#region PLANE 2 PROJECTION
/* PLANE 2 PROJECTION */
if (plane2.Point4.Y > targetY) //plane 2 is completely above the line
{
intersect3 = Utils.LinePointFromKnownY(plane2.Point4, plane1.Point4, targetY);
}
else //point 4 of plane 2 is below the line
{
if (plane2.Point2.Y < targetY) //point 2 of plane 2 is below the line - Down 1, 2, 3 & 4
{
intersect3 = Utils.LinePointFromKnownY(plane2.Point3, plane1.Point3, targetY);
intersect4 = Utils.LinePointFromKnownY(plane2.Point2, plane1.Point1, targetY);
intersect5 = Utils.LinePointFromKnownY(plane2.Point1, plane1.Point1, targetY);
pointCount = 5;
}
else //point 2 of plane 2 is above the line
{
if (plane2.Point3.Y > targetY) //plane 2 point 3 is above the line
{
intersect3 = Utils.LinePointFromKnownY(plane2.Point3, plane2.Point4, targetY);
}
else //plane 2 point 3 is below the line
{
intersect3 = Utils.LinePointFromKnownY(plane2.Point3, plane1.Point3, targetY);
intersect4 = Utils.LinePointFromKnownY(plane2.Point2, plane2.Point3, targetY);
pointCount = 4;
}
if (plane2.Point1.Y > targetY) //plane 2 point 1 is above the line
{
if (pointCount == 4)
intersect5 = Utils.LinePointFromKnownY(plane2.Point1, plane2.Point4, targetY);
else
intersect4 = Utils.LinePointFromKnownY(plane2.Point1, plane2.Point4, targetY);
pointCount++;
}
else //plane 2 point 1 is below the line
{
if (pointCount == 4)
{
intersect5 = Utils.LinePointFromKnownY(plane2.Point2, plane2.Point1, targetY);
intersect6 = Utils.LinePointFromKnownY(plane2.Point1, plane1.Point1, targetY);
}
else
{
intersect4 = Utils.LinePointFromKnownY(plane2.Point2, plane2.Point1, targetY);
intersect5 = Utils.LinePointFromKnownY(plane2.Point1, plane1.Point1, targetY);
}
pointCount += 2;
}
}
}
/* END PLANE 2 PROJECTION */
#endregion
}
else //point 3 is below the target plane
{
if (plane1.Point4.Y > targetY) //point 4 is above the target plane - points 1, 2 & 4 above
{
intersect1 = Utils.LinePointFromKnownY(plane1.Point4, plane1.Point3, targetY);
intersect2 = Utils.LinePointFromKnownY(plane1.Point2, plane1.Point3, targetY);
pointCount = 3;
#region PLANE 2 PROJECTION
/* PLANE 2 PROJECTION */
if (plane2.Point3.Y > targetY) //plane 2 is completely above the line
{
intersect3 = Utils.LinePointFromKnownY(plane2.Point3, plane1.Point3, targetY);
}
else //point 4 of plane 2 is below the line
{
if (plane2.Point1.Y < targetY) //point 2 of plane 2 is below the line - Down 1, 2, 3 & 4
{
intersect3 = Utils.LinePointFromKnownY(plane2.Point2, plane1.Point2, targetY);
intersect4 = Utils.LinePointFromKnownY(plane2.Point1, plane1.Point4, targetY);
intersect5 = Utils.LinePointFromKnownY(plane2.Point4, plane1.Point4, targetY);
pointCount = 5;
}
else //point 2 of plane 2 is above the line
{
if (plane2.Point2.Y > targetY) //plane 2 point 3 is above the line
{
intersect3 = Utils.LinePointFromKnownY(plane2.Point2, plane2.Point3, targetY);
}
else //plane 2 point 3 is below the line
{
intersect3 = Utils.LinePointFromKnownY(plane2.Point2, plane1.Point2, targetY);
intersect4 = Utils.LinePointFromKnownY(plane2.Point1, plane2.Point2, targetY);
pointCount = 4;
}
if (plane2.Point4.Y > targetY) //plane 2 point 1 is above the line
{
if (pointCount == 4)
intersect5 = Utils.LinePointFromKnownY(plane2.Point4, plane2.Point3, targetY);
else
intersect4 = Utils.LinePointFromKnownY(plane2.Point4, plane2.Point3, targetY);
pointCount++;
}
else //plane 2 point 1 is below the line
{
if (pointCount == 4)
{
intersect5 = Utils.LinePointFromKnownY(plane2.Point1, plane2.Point4, targetY);
intersect6 = Utils.LinePointFromKnownY(plane2.Point4, plane1.Point4, targetY);
}
else
{
intersect4 = Utils.LinePointFromKnownY(plane2.Point1, plane2.Point4, targetY);
intersect5 = Utils.LinePointFromKnownY(plane2.Point4, plane1.Point4, targetY);
}
pointCount += 2;
}
}
}
/* END PLANE 2 PROJECTION */
#endregion
}
else //points 3 and 4 are both below the target plane - points 1 & 2 are above
{
intersect1 = Utils.LinePointFromKnownY(plane1.Point1, plane1.Point4, targetY);
intersect2 = Utils.LinePointFromKnownY(plane1.Point2, plane1.Point3, targetY);
#region PLANE 2 PROJECTION
if (plane2.Point2.Y > targetY) //point2 is above
{
if (plane2.Point3.Y > targetY) //point3 is above
{
if (plane2.Point4.Y > targetY) //All four points are above
{
intersect3 = Utils.LinePointFromKnownY(plane2.Point3, plane1.Point3, targetY);
intersect4 = Utils.LinePointFromKnownY(plane2.Point4, plane1.Point4, targetY);
pointCount = 4;
}
else //point4 is below - point1, point2 and point3 are above
{
intersect3 = Utils.LinePointFromKnownY(plane2.Point3, plane1.Point3, targetY);
intersect4 = Utils.LinePointFromKnownY(plane2.Point3, plane2.Point4, targetY);
intersect5 = Utils.LinePointFromKnownY(plane2.Point1, plane2.Point4, targetY);
pointCount = 5;
}
}
else //point3 is below
{
if (plane2.Point4.Y > targetY) //point1, point2, and point4 are above
{
intersect3 = Utils.LinePointFromKnownY(plane2.Point2, plane2.Point3, targetY);
intersect4 = Utils.LinePointFromKnownY(plane2.Point4, plane2.Point3, targetY);
intersect5 = Utils.LinePointFromKnownY(plane2.Point4, plane1.Point4, targetY);
pointCount = 5;
}
else //point4 is below
{
if (plane2.Point1.Y > targetY) //point1 and point2 are above
{
intersect3 = Utils.LinePointFromKnownY(plane2.Point2, plane2.Point3, targetY);
intersect4 = Utils.LinePointFromKnownY(plane2.Point1, plane2.Point4, targetY);
pointCount = 4;
}
else //only point2 is above
{
intersect3 = Utils.LinePointFromKnownY(plane2.Point2, plane2.Point3, targetY);
intersect4 = Utils.LinePointFromKnownY(plane2.Point2, plane2.Point1, targetY);
intersect5 = Utils.LinePointFromKnownY(plane2.Point1, plane1.Point1, targetY);
pointCount = 5;
}
}
}
}
else //Point2 is below
{
if (plane2.Point1.Y > targetY) //only point1 is above
{
intersect3 = Utils.LinePointFromKnownY(plane2.Point2, plane1.Point2, targetY);
intersect4 = Utils.LinePointFromKnownY(plane2.Point1, plane2.Point2, targetY);
intersect5 = Utils.LinePointFromKnownY(plane2.Point1, plane2.Point4, targetY);
pointCount = 5;
}
else //all points are below
{
intersect3 = Utils.LinePointFromKnownY(plane2.Point2, plane1.Point2, targetY);
intersect4 = Utils.LinePointFromKnownY(plane2.Point1, plane1.Point1, targetY);
pointCount = 4;
}
}
#endregion
}
}
}
else //point 2 is below the target plane
{
if (plane1.Point4.Y < targetY) //point 4 is also below the target plane, point 3 must be also - point 1 is above
{
intersect1 = Utils.LinePointFromKnownY(plane1.Point1, plane1.Point4, targetY);
intersect2 = Utils.LinePointFromKnownY(plane1.Point1, plane1.Point2, targetY);
pointCount = 3;
#region PLANE 2 PROJECTION
if (plane2.Point1.Y < targetY) //All of plane 2 is below
{
intersect3 = Utils.LinePointFromKnownY(plane2.Point1, plane1.Point1, targetY);
}
else //point1 is above
{
if (plane2.Point3.Y > targetY) //All of plane 2 is above
{
intersect3 = Utils.LinePointFromKnownY(plane2.Point2, plane1.Point2, targetY);
intersect4 = Utils.LinePointFromKnownY(plane2.Point3, plane1.Point3, targetY);
intersect5 = Utils.LinePointFromKnownY(plane2.Point4, plane1.Point4, targetY);
pointCount = 5;
}
else //point3 is below
{
if (plane2.Point2.Y > targetY) //point2 is above
{
intersect3 = Utils.LinePointFromKnownY(plane2.Point2, plane1.Point2, targetY);
intersect4 = Utils.LinePointFromKnownY(plane2.Point2, plane2.Point3, targetY);
pointCount = 4;
}
else //point2 is below
{
intersect3 = Utils.LinePointFromKnownY(plane2.Point1, plane2.Point2, targetY);
pointCount = 3;
}
if (plane2.Point4.Y > targetY) //point4 is above
{
if (pointCount == 4)
{
intersect5 = Utils.LinePointFromKnownY(plane2.Point4, plane2.Point3, targetY);
intersect6 = Utils.LinePointFromKnownY(plane2.Point4, plane1.Point4, targetY);
pointCount = 6;
}
else //point2 was below
{
intersect4 = Utils.LinePointFromKnownY(plane2.Point4, plane2.Point3, targetY);
intersect5 = Utils.LinePointFromKnownY(plane2.Point4, plane1.Point4, targetY);
pointCount = 5;
}
}
else //point4 is below
{
if (pointCount == 4)
{
intersect5 = Utils.LinePointFromKnownY(plane2.Point1, plane2.Point4, targetY);
pointCount = 5;
}
else //point2 was below, only point1 is above
{
intersect4 = Utils.LinePointFromKnownY(plane2.Point1, plane2.Point4, targetY);
pointCount = 4;
}
}
}
}
#endregion
}
else //point 4 is above the target plane
{
if (plane1.Point3.Y < targetY) //point 3 is below the target plane - 1 & 4 are above
{
intersect1 = Utils.LinePointFromKnownY(plane1.Point4, plane1.Point3, targetY);
intersect2 = Utils.LinePointFromKnownY(plane1.Point1, plane1.Point2, targetY);
#region PLANE 2 PROJECTION
if (plane2.Point1.Y > targetY) //Point1 is above
{
if (plane2.Point2.Y > targetY) //Point2 is above
{
if (plane2.Point3.Y > targetY) //All four points are above
{
intersect3 = Utils.LinePointFromKnownY(plane2.Point2, plane1.Point2, targetY);
intersect4 = Utils.LinePointFromKnownY(plane2.Point3, plane1.Point3, targetY);
pointCount = 4;
}
else //Point3 is below - Point4, Point1 and Point2 are above
{
intersect3 = Utils.LinePointFromKnownY(plane2.Point2, plane1.Point2, targetY);
intersect4 = Utils.LinePointFromKnownY(plane2.Point2, plane2.Point3, targetY);
intersect5 = Utils.LinePointFromKnownY(plane2.Point4, plane2.Point3, targetY);
pointCount = 5;
}
}
else //Point2 is below
{
if (plane2.Point3.Y > targetY) //Point4, Point1, and Point3 are above
{
intersect3 = Utils.LinePointFromKnownY(plane2.Point1, plane2.Point2, targetY);
intersect4 = Utils.LinePointFromKnownY(plane2.Point3, plane2.Point2, targetY);
intersect5 = Utils.LinePointFromKnownY(plane2.Point3, plane1.Point3, targetY);
pointCount = 5;
}
else //Point3 is below
{
if (plane2.Point4.Y > targetY) //Point4 and Point1 are above
{
intersect3 = Utils.LinePointFromKnownY(plane2.Point1, plane2.Point2, targetY);
intersect4 = Utils.LinePointFromKnownY(plane2.Point4, plane2.Point3, targetY);
pointCount = 4;
}
else //only Point1 is above
{
intersect3 = Utils.LinePointFromKnownY(plane2.Point1, plane2.Point2, targetY);
intersect4 = Utils.LinePointFromKnownY(plane2.Point1, plane2.Point4, targetY);
intersect5 = Utils.LinePointFromKnownY(plane2.Point4, plane1.Point4, targetY);
pointCount = 5;
}
}
}
}
else //Point1 is below
{
if (plane2.Point4.Y > targetY) //only Point4 is above
{
intersect3 = Utils.LinePointFromKnownY(plane2.Point1, plane1.Point1, targetY);
intersect4 = Utils.LinePointFromKnownY(plane2.Point4, plane2.Point1, targetY);
intersect5 = Utils.LinePointFromKnownY(plane2.Point4, plane2.Point3, targetY);
pointCount = 5;
}
else //all points are below
{
intersect3 = Utils.LinePointFromKnownY(plane2.Point1, plane1.Point1, targetY);
intersect4 = Utils.LinePointFromKnownY(plane2.Point4, plane1.Point4, targetY);
pointCount = 4;
}
}
#endregion
}
else //points 1, 4 & 3 are above
{
intersect1 = Utils.LinePointFromKnownY(plane1.Point3, plane1.Point2, targetY);
intersect2 = Utils.LinePointFromKnownY(plane1.Point1, plane1.Point2, targetY);
pointCount = 3;
#region PLANE 2 PROJECTION
/* PLANE 2 PROJECTION */
if (plane2.Point2.Y > targetY) //plane 2 is completely above the line
{
intersect3 = Utils.LinePointFromKnownY(plane2.Point2, plane1.Point2, targetY);
}
else //point 4 of plane 2 is below the line
{
if (plane2.Point4.Y < targetY) //point 2 of plane 2 is below the line - Down 1, 2, 3 & 4
{
intersect3 = Utils.LinePointFromKnownY(plane2.Point1, plane1.Point1, targetY);
intersect4 = Utils.LinePointFromKnownY(plane2.Point4, plane1.Point3, targetY);
intersect5 = Utils.LinePointFromKnownY(plane2.Point3, plane1.Point3, targetY);
pointCount = 5;
}
else //point 2 of plane 2 is above the line
{
if (plane2.Point1.Y > targetY) //plane 2 point 3 is above the line
{
intersect3 = Utils.LinePointFromKnownY(plane2.Point1, plane2.Point2, targetY);
}
else //plane 2 point 3 is below the line
{
intersect3 = Utils.LinePointFromKnownY(plane2.Point1, plane1.Point1, targetY);
intersect4 = Utils.LinePointFromKnownY(plane2.Point4, plane2.Point1, targetY);
pointCount = 4;
}
if (plane2.Point3.Y > targetY) //plane 2 point 1 is above the line
{
if (pointCount == 4)
intersect5 = Utils.LinePointFromKnownY(plane2.Point3, plane2.Point2, targetY);
else
intersect4 = Utils.LinePointFromKnownY(plane2.Point3, plane2.Point2, targetY);
pointCount++;
}
else //plane 2 point 1 is below the line
{
if (pointCount == 4)
{
intersect5 = Utils.LinePointFromKnownY(plane2.Point4, plane2.Point3, targetY);
intersect6 = Utils.LinePointFromKnownY(plane2.Point3, plane1.Point3, targetY);
}
else
{
intersect4 = Utils.LinePointFromKnownY(plane2.Point4, plane2.Point3, targetY);
intersect5 = Utils.LinePointFromKnownY(plane2.Point3, plane1.Point3, targetY);
}
pointCount += 2;
}
}
}
/* END PLANE 2 PROJECTION */
#endregion
}
}
}
}
else //point 1 is below the target plane
{
if (plane1.Point2.Y > targetY) //point 2 is above the plane
{
if (plane1.Point4.Y > targetY) //points 2 and 4 are above the plane so point 3 must be as well Up 2, 3 & 4
{
intersect1 = Utils.LinePointFromKnownY(plane1.Point2, plane1.Point1, targetY);
intersect2 = Utils.LinePointFromKnownY(plane1.Point4, plane1.Point1, targetY);
pointCount = 3;
#region PLANE 2 PROJECTION
/* PLANE 2 PROJECTION */
if (plane2.Point1.Y > targetY) //plane 2 is completely above the line
{
intersect3 = Utils.LinePointFromKnownY(plane2.Point1, plane1.Point1, targetY);
}
else //point 4 of plane 2 is below the line
{
if (plane2.Point3.Y < targetY) //point 2 of plane 2 is below the line - Down 1, 2, 3 & 4
{
intersect3 = Utils.LinePointFromKnownY(plane2.Point4, plane1.Point4, targetY);
intersect4 = Utils.LinePointFromKnownY(plane2.Point3, plane1.Point2, targetY);
intersect5 = Utils.LinePointFromKnownY(plane2.Point2, plane1.Point2, targetY);
pointCount = 5;
}
else //point 2 of plane 2 is above the line
{
if (plane2.Point4.Y > targetY) //plane 2 point 3 is above the line
{
intersect3 = Utils.LinePointFromKnownY(plane2.Point4, plane2.Point1, targetY);
}
else //plane 2 point 3 is below the line
{
intersect3 = Utils.LinePointFromKnownY(plane2.Point4, plane1.Point4, targetY);
intersect4 = Utils.LinePointFromKnownY(plane2.Point3, plane2.Point4, targetY);
pointCount = 4;
}
if (plane2.Point2.Y > targetY) //plane 2 point 1 is above the line
{
if (pointCount == 4)
intersect5 = Utils.LinePointFromKnownY(plane2.Point2, plane2.Point1, targetY);
else
intersect4 = Utils.LinePointFromKnownY(plane2.Point2, plane2.Point1, targetY);
pointCount++;
}
else //plane 2 point 1 is below the line
{
if (pointCount == 4)
{
intersect5 = Utils.LinePointFromKnownY(plane2.Point3, plane2.Point2, targetY);
intersect6 = Utils.LinePointFromKnownY(plane2.Point2, plane1.Point2, targetY);
}
else
{
intersect4 = Utils.LinePointFromKnownY(plane2.Point3, plane2.Point2, targetY);
intersect5 = Utils.LinePointFromKnownY(plane2.Point2, plane1.Point2, targetY);
}
pointCount += 2;
}
}
}
/* END PLANE 2 PROJECTION */
#endregion
}
else //point 4 is below the plane
{
if (plane1.Point3.Y > targetY) //point 3 is above the plane - Up 2 & 3
{
intersect1 = Utils.LinePointFromKnownY(plane1.Point2, plane1.Point1, targetY);
intersect2 = Utils.LinePointFromKnownY(plane1.Point3, plane1.Point4, targetY);
#region PLANE 2 PROJECTION
if (plane2.Point3.Y > targetY) //Point3 is above
{
if (plane2.Point4.Y > targetY) //Point4 is above
{
if (plane2.Point1.Y > targetY) //All four points are above
{
intersect3 = Utils.LinePointFromKnownY(plane2.Point4, plane1.Point4, targetY);
intersect4 = Utils.LinePointFromKnownY(plane2.Point1, plane1.Point1, targetY);
pointCount = 4;
}
else //Point1 is below - Point2, Point3 and Point4 are above
{
intersect3 = Utils.LinePointFromKnownY(plane2.Point4, plane1.Point4, targetY);
intersect4 = Utils.LinePointFromKnownY(plane2.Point4, plane2.Point1, targetY);
intersect5 = Utils.LinePointFromKnownY(plane2.Point2, plane2.Point1, targetY);
pointCount = 5;
}
}
else //Point4 is below
{
if (plane2.Point1.Y > targetY) //Point2, Point3, and Point1 are above
{
intersect3 = Utils.LinePointFromKnownY(plane2.Point3, plane2.Point4, targetY);
intersect4 = Utils.LinePointFromKnownY(plane2.Point1, plane2.Point4, targetY);
intersect5 = Utils.LinePointFromKnownY(plane2.Point1, plane1.Point1, targetY);
pointCount = 5;
}
else //Point1 is below
{
if (plane2.Point2.Y > targetY) //Point2 and Point3 are above
{
intersect3 = Utils.LinePointFromKnownY(plane2.Point3, plane2.Point4, targetY);
intersect4 = Utils.LinePointFromKnownY(plane2.Point2, plane2.Point1, targetY);
pointCount = 4;
}
else //only Point3 is above
{
intersect3 = Utils.LinePointFromKnownY(plane2.Point3, plane2.Point4, targetY);
intersect4 = Utils.LinePointFromKnownY(plane2.Point3, plane2.Point2, targetY);
intersect5 = Utils.LinePointFromKnownY(plane2.Point2, plane1.Point2, targetY);
pointCount = 5;
}
}
}
}
else //Point3 is below
{
if (plane2.Point2.Y > targetY) //only Point2 is above
{
intersect3 = Utils.LinePointFromKnownY(plane2.Point3, plane1.Point3, targetY);
intersect4 = Utils.LinePointFromKnownY(plane2.Point2, plane2.Point3, targetY);
intersect5 = Utils.LinePointFromKnownY(plane2.Point2, plane2.Point1, targetY);
pointCount = 5;
}
else //all points are below
{
intersect3 = Utils.LinePointFromKnownY(plane2.Point3, plane1.Point3, targetY);
intersect4 = Utils.LinePointFromKnownY(plane2.Point2, plane1.Point2, targetY);
pointCount = 4;
}
}
#endregion
}
else //only point 2 is above the plane - Up 2
{
intersect1 = Utils.LinePointFromKnownY(plane1.Point2, plane1.Point3, targetY);
intersect2 = Utils.LinePointFromKnownY(plane1.Point2, plane1.Point3, targetY);
pointCount = 3;
#region PLANE 2 PROJECTION
if (plane2.Point2.Y < targetY) //All of plane 2 is below
{
intersect3 = Utils.LinePointFromKnownY(plane2.Point2, plane1.Point2, targetY);
}
else //Point2 is above
{
if (plane2.Point4.Y > targetY) //All of plane 2 is above
{
intersect3 = Utils.LinePointFromKnownY(plane2.Point3, plane1.Point3, targetY);
intersect4 = Utils.LinePointFromKnownY(plane2.Point4, plane1.Point4, targetY);
intersect5 = Utils.LinePointFromKnownY(plane2.Point1, plane1.Point1, targetY);
pointCount = 5;
}
else //Point4 is below
{
if (plane2.Point3.Y > targetY) //Point3 is above
{
intersect3 = Utils.LinePointFromKnownY(plane2.Point3, plane1.Point3, targetY);
intersect4 = Utils.LinePointFromKnownY(plane2.Point3, plane2.Point4, targetY);
pointCount = 4;
}
else //Point3 is below
{
intersect3 = Utils.LinePointFromKnownY(plane2.Point2, plane2.Point3, targetY);
pointCount = 3;
}
if (plane2.Point1.Y > targetY) //Point1 is above
{
if (pointCount == 4)
{
intersect5 = Utils.LinePointFromKnownY(plane2.Point1, plane2.Point4, targetY);
intersect6 = Utils.LinePointFromKnownY(plane2.Point1, plane1.Point1, targetY);
pointCount = 6;
}
else //Point3 was below
{
intersect4 = Utils.LinePointFromKnownY(plane2.Point1, plane2.Point4, targetY);
intersect5 = Utils.LinePointFromKnownY(plane2.Point1, plane1.Point1, targetY);
pointCount = 5;
}
}
else //Point1 is below
{
if (pointCount == 4)
{
intersect5 = Utils.LinePointFromKnownY(plane2.Point2, plane2.Point1, targetY);
pointCount = 5;
}
else //Point3 was below, only Point2 is above
{
intersect4 = Utils.LinePointFromKnownY(plane2.Point2, plane2.Point1, targetY);
pointCount = 4;
}
}
}
}
#endregion
}
}
}
else //point 2 is below the line
{
if (plane1.Point3.Y > targetY) //point 3 is above the line
{
if (plane1.Point4.Y > targetY) //points 3 and 4 are above the line - Up 3 & 4
{
intersect1 = Utils.LinePointFromKnownY(plane1.Point3, plane1.Point2, targetY);
intersect2 = Utils.LinePointFromKnownY(plane1.Point4, plane1.Point1, targetY);
#region PLANE 2 PROJECTION
if (plane2.Point4.Y > targetY) //Point4 is above
{
if (plane2.Point1.Y > targetY) //Point1 is above
{
if (plane2.Point2.Y > targetY) //All four points are above
{
intersect3 = Utils.LinePointFromKnownY(plane2.Point1, plane1.Point1, targetY);
intersect4 = Utils.LinePointFromKnownY(plane2.Point2, plane1.Point2, targetY);
pointCount = 4;
}
else //Point2 is below - Point3, Point4 and Point1 are above
{
intersect3 = Utils.LinePointFromKnownY(plane2.Point1, plane1.Point1, targetY);
intersect4 = Utils.LinePointFromKnownY(plane2.Point1, plane2.Point2, targetY);
intersect5 = Utils.LinePointFromKnownY(plane2.Point3, plane2.Point2, targetY);
pointCount = 5;
}
}
else //Point1 is below
{
if (plane2.Point2.Y > targetY) //Point3, Point4, and Point2 are above
{
intersect3 = Utils.LinePointFromKnownY(plane2.Point4, plane2.Point1, targetY);
intersect4 = Utils.LinePointFromKnownY(plane2.Point2, plane2.Point1, targetY);
intersect5 = Utils.LinePointFromKnownY(plane2.Point2, plane1.Point2, targetY);
pointCount = 5;
}
else //Point2 is below
{
if (plane2.Point3.Y > targetY) //Point3 and Point4 are above
{
intersect3 = Utils.LinePointFromKnownY(plane2.Point4, plane2.Point1, targetY);
intersect4 = Utils.LinePointFromKnownY(plane2.Point3, plane2.Point2, targetY);
pointCount = 4;
}
else //only Point4 is above
{
intersect3 = Utils.LinePointFromKnownY(plane2.Point4, plane2.Point1, targetY);
intersect4 = Utils.LinePointFromKnownY(plane2.Point4, plane2.Point3, targetY);
intersect5 = Utils.LinePointFromKnownY(plane2.Point3, plane1.Point3, targetY);
pointCount = 5;
}
}
}
}
else //Point4 is below
{
if (plane2.Point3.Y > targetY) //only Point3 is above
{
intersect3 = Utils.LinePointFromKnownY(plane2.Point4, plane1.Point4, targetY);
intersect4 = Utils.LinePointFromKnownY(plane2.Point3, plane2.Point4, targetY);
intersect5 = Utils.LinePointFromKnownY(plane2.Point3, plane2.Point2, targetY);
pointCount = 5;
}
else //all points are below
{
intersect3 = Utils.LinePointFromKnownY(plane2.Point4, plane1.Point4, targetY);
intersect4 = Utils.LinePointFromKnownY(plane2.Point3, plane1.Point3, targetY);
pointCount = 4;
}
}
#endregion
}
else //only point 3 is above the line - Up 3
{
intersect1 = Utils.LinePointFromKnownY(plane1.Point3, plane1.Point2, targetY);
intersect2 = Utils.LinePointFromKnownY(plane1.Point3, plane1.Point4, targetY);
pointCount = 3;
#region PLANE 2 PROJECTION
if (plane2.Point3.Y < targetY) //All of plane 2 is below
{
intersect3 = Utils.LinePointFromKnownY(plane2.Point3, plane1.Point3, targetY);
}
else //Point3 is above
{
if (plane2.Point1.Y > targetY) //All of plane 2 is above
{
intersect3 = Utils.LinePointFromKnownY(plane2.Point4, plane1.Point4, targetY);
intersect4 = Utils.LinePointFromKnownY(plane2.Point1, plane1.Point1, targetY);
intersect5 = Utils.LinePointFromKnownY(plane2.Point2, plane1.Point2, targetY);
pointCount = 5;
}
else //Point1 is below
{
if (plane2.Point4.Y > targetY) //Point4 is above
{
intersect3 = Utils.LinePointFromKnownY(plane2.Point4, plane1.Point4, targetY);
intersect4 = Utils.LinePointFromKnownY(plane2.Point4, plane2.Point1, targetY);
pointCount = 4;
}
else //Point4 is below
{
intersect3 = Utils.LinePointFromKnownY(plane2.Point3, plane2.Point4, targetY);
pointCount = 3;
}
if (plane2.Point2.Y > targetY) //Point2 is above
{
if (pointCount == 4)
{
intersect5 = Utils.LinePointFromKnownY(plane2.Point2, plane2.Point1, targetY);
intersect6 = Utils.LinePointFromKnownY(plane2.Point2, plane1.Point2, targetY);
pointCount = 6;
}
else //Point4 was below
{
intersect4 = Utils.LinePointFromKnownY(plane2.Point2, plane2.Point1, targetY);
intersect5 = Utils.LinePointFromKnownY(plane2.Point2, plane1.Point2, targetY);
pointCount = 5;
}
}
else //Point2 is below
{
if (pointCount == 4)
{
intersect5 = Utils.LinePointFromKnownY(plane2.Point3, plane2.Point2, targetY);
pointCount = 5;
}
else //Point4 was below, only Point3 is above
{
intersect4 = Utils.LinePointFromKnownY(plane2.Point3, plane2.Point2, targetY);
pointCount = 4;
}
}
}
}
#endregion
}
}
else //points 1, 2 & 3 are all below, Up 4
{
intersect1 = Utils.LinePointFromKnownY(plane1.Point4, plane1.Point3, targetY);
intersect2 = Utils.LinePointFromKnownY(plane1.Point4, plane1.Point1, targetY);
pointCount = 3;
#region PLANE 2 PROJECTION
if (plane2.Point4.Y < targetY) //All of plane 2 is below
{
intersect3 = Utils.LinePointFromKnownY(plane2.Point4, plane1.Point4, targetY);
}
else //Point4 is above
{
if (plane2.Point2.Y > targetY) //All of plane 2 is above
{
intersect3 = Utils.LinePointFromKnownY(plane2.Point1, plane1.Point1, targetY);
intersect4 = Utils.LinePointFromKnownY(plane2.Point2, plane1.Point2, targetY);
intersect5 = Utils.LinePointFromKnownY(plane2.Point3, plane1.Point3, targetY);
pointCount = 5;
}
else //Point2 is below
{
if (plane2.Point1.Y > targetY) //Point1 is above
{
intersect3 = Utils.LinePointFromKnownY(plane2.Point1, plane1.Point1, targetY);
intersect4 = Utils.LinePointFromKnownY(plane2.Point1, plane2.Point2, targetY);
pointCount = 4;
}
else //Point1 is below
{
intersect3 = Utils.LinePointFromKnownY(plane2.Point4, plane2.Point1, targetY);
pointCount = 3;
}
if (plane2.Point3.Y > targetY) //Point3 is above
{
if (pointCount == 4)
{
intersect5 = Utils.LinePointFromKnownY(plane2.Point3, plane2.Point2, targetY);
intersect6 = Utils.LinePointFromKnownY(plane2.Point3, plane1.Point3, targetY);
pointCount = 6;
}
else //Point1 was below
{
intersect4 = Utils.LinePointFromKnownY(plane2.Point3, plane2.Point2, targetY);
intersect5 = Utils.LinePointFromKnownY(plane2.Point3, plane1.Point3, targetY);
pointCount = 5;
}
}
else //Point3 is below
{
if (pointCount == 4)
{
intersect5 = Utils.LinePointFromKnownY(plane2.Point4, plane2.Point3, targetY);
pointCount = 5;
}
else //Point1 was below, only Point4 is above
{
intersect4 = Utils.LinePointFromKnownY(plane2.Point4, plane2.Point3, targetY);
pointCount = 4;
}
}
}
}
#endregion
}
}
}
var point1 = new Vector2(intersect1.X, intersect1.Z);
var point2 = new Vector2(intersect2.X, intersect2.Z);
var point3 = new Vector2(intersect3.X, intersect3.Z);
var point4 = new Vector2(intersect4.X, intersect4.Z);
var point5 = new Vector2(intersect5.X, intersect5.Z);
var point6 = new Vector2(intersect6.X, intersect6.Z);
switch (pointCount)
{
case 3:
return ViewClipShape.FromPoints(point1, point2, point3);
case 4:
return ViewClipShape.FromPoints(point1, point2, point3, point4);
case 5:
return ViewClipShape.FromPoints(point1, point2, point3, point4, point5);
default:
return ViewClipShape.FromPoints(point1, point2, point3, point4, point5, point6);
}
}
/// <summary>
/// Ground does not intersect either plane, but lies between them.
/// </summary>
/// <param name="plane1"></param>
/// <param name="plane2"></param>
/// <param name="targetY"></param>
/// <returns></returns>
private static ViewClipShape FromNoIntersection(ClipPlane plane1, ClipPlane plane2, float targetY)
{
var intersect1 = Utils.LinePointFromKnownY(plane1.Point1, plane2.Point1, targetY);
var intersect2 = Utils.LinePointFromKnownY(plane1.Point2, plane2.Point2, targetY);
var intersect3 = Utils.LinePointFromKnownY(plane1.Point3, plane2.Point3, targetY);
var intersect4 = Utils.LinePointFromKnownY(plane1.Point4, plane2.Point4, targetY);
var point1 = new Vector2(intersect1.X, intersect1.Z);
var point2 = new Vector2(intersect2.X, intersect2.Z);
var point3 = new Vector2(intersect3.X, intersect3.Z);
var point4 = new Vector2(intersect4.X, intersect4.Z);
return ViewClipShape.FromPoints(point1, point2, point3, point4);
}
