private static BoundingBox Find_via_MC_ApproachOne(TessellatedSolid ts)
{
BoundingBox minBox = new BoundingBox();
var minVolume = double.PositiveInfinity;
foreach (var convexHullEdge in ts.ConvexHullEdges)
{
var rotAxis = convexHullEdge.Vector.normalize();
var n = convexHullEdge.OwnedFace.Normal;
var numSamples = (int)Math.Ceiling((Math.PI - convexHullEdge.InternalAngle) / MaxDeltaAngle);
var deltaAngle = (Math.PI - convexHullEdge.InternalAngle) / numSamples;
var edgeBBs = new BoundingBox[numSamples];
for (var i = 0; i < numSamples; i++)
{
double[] direction;
if (i == 0) direction = n;
else
{
var angleChange = i * deltaAngle;
var invCrossMatrix = new[,]
{
{n[0]*n[0], n[0]*n[1], n[0]*n[2]},
{n[1]*n[0], n[1]*n[1], n[1]*n[2]},
{n[2]*n[0], n[2]*n[1], n[2]*n[2]}
};
direction = invCrossMatrix.multiply(rotAxis.multiply(Math.Sin(angleChange)));
}
edgeBBs[i] = FindOBBAlongDirection(ts.ConvexHullVertices, direction);
if (edgeBBs[i].Volume < minVolume)
{
minBox = edgeBBs[i];
minVolume = minBox.Volume;
}
}
}
return minBox;
}
/// <summary>
/// Adjusts the orthogonal rotations.
/// </summary>
/// <param name="convexHullVertices">The convex hull vertices.</param>
/// <param name="minOBB">The minimum obb.</param>
/// <returns>BoundingBox.</returns>
private static BoundingBox AdjustOrthogonalRotations(IList <Vertex> convexHullVertices, BoundingBox minOBB)
{
var failedConsecutiveRotations = 0;
var k = 0;
var i = 0;
do
{
//Find new OBB along OBB.direction2 and OBB.direction3, keeping the best OBB.
var newObb = FindOBBAlongDirection(convexHullVertices, minOBB.Directions[i++]);
if (newObb.Volume.IsLessThanNonNegligible(minOBB.Volume))
{
minOBB = newObb;
failedConsecutiveRotations = 0;
}
else
{
failedConsecutiveRotations++;
}
if (i == 3)
{
i = 0;
}
k++;
} while (failedConsecutiveRotations < 3 && k < MaxRotationsForOBB);
return(minOBB);
}
