/// <summary>
/// Initializes a new instance of the <see cref="TVGLConvexHull" /> class.
/// </summary>
/// <param name="ts">The tessellated solid that the convex hull is made from.</param>
public TVGLConvexHull(IList <Vertex> vertices, double tolerance)
{
var convexHull = ConvexHull.Create(vertices, tolerance);
Vertices = convexHull.Points.ToArray();
var convexHullFaceList = new List <PolygonalFace>();
var checkSumMultipliers = new long[3];
for (var i = 0; i < 3; i++)
{
checkSumMultipliers[i] = (long)Math.Pow(Constants.CubeRootOfLongMaxValue, i);
}
var alreadyCreatedFaces = new HashSet <long>();
foreach (var cvxFace in convexHull.Faces)
{
var faceVertices = cvxFace.Vertices;
var orderedIndices = faceVertices.Select(v => v.IndexInList).ToList();
orderedIndices.Sort();
var checksum = orderedIndices.Select((t, j) => t * checkSumMultipliers[j]).Sum();
if (alreadyCreatedFaces.Contains(checksum))
{
continue;
}
alreadyCreatedFaces.Add(checksum);
convexHullFaceList.Add(new PolygonalFace(faceVertices, cvxFace.Normal, false));
}
Faces = convexHullFaceList.ToArray();
Edges = MakeEdges(Faces, Vertices);
TessellatedSolid.DefineCenterVolumeAndSurfaceArea(Faces, out Center, out Volume, out SurfaceArea);
}
internal TVGLConvexHull(IList <Vertex> allVertices, IList <Vertex> convexHullPoints,
IList <int> convexHullFaceIndices, double[] center = null, double volume = double.NaN,
double surfaceArea = double.NaN)
{
Vertices = convexHullPoints.ToArray();
var numCvxHullFaces = convexHullFaceIndices.Count / 3;
Faces = new PolygonalFace[numCvxHullFaces];
var checkSumMultipliers = new long[3];
for (var i = 0; i < 3; i++)
{
checkSumMultipliers[i] = (long)Math.Pow(Constants.CubeRootOfLongMaxValue, i);
}
var alreadyCreatedFaces = new HashSet <long>();
for (int i = 0; i < numCvxHullFaces; i++)
{
var orderedIndices = new List <int>
{
convexHullFaceIndices[3 * i], convexHullFaceIndices[3 * i + 1], convexHullFaceIndices[3 * i + 2]
};
orderedIndices.Sort();
var checksum = orderedIndices.Select((t, j) => t * checkSumMultipliers[j]).Sum();
if (alreadyCreatedFaces.Contains(checksum))
{
continue;
}
alreadyCreatedFaces.Add(checksum);
var faceVertices = new[]
{
allVertices[convexHullFaceIndices[3 * i]],
allVertices[convexHullFaceIndices[3 * i + 1]],
allVertices[convexHullFaceIndices[3 * i + 2]],
};
Faces[i] = new PolygonalFace(faceVertices, false);
}
Edges = MakeEdges(Faces, Vertices);
if (center == null || double.IsNaN(volume) || double.IsNaN(surfaceArea))
{
TessellatedSolid.DefineCenterVolumeAndSurfaceArea(Faces, out Center, out Volume, out SurfaceArea);
}
else
{
Center = center;
Volume = volume;
SurfaceArea = surfaceArea;
}
}
