private void FillCutEdges(Hull a, Hull b, IList <Edge> edgesA, IList <Edge> edgesB, Vector3 planeNormal, UvMapper uvMapper)
{
// Create outline data
int outlineEdgeCount = edgesA.Count;
Vector3[] outlinePoints = new Vector3[outlineEdgeCount];
int[] outlineEdges = new int[outlineEdgeCount * 2];
int startIndex = 0;
for (int i = 0; i < outlineEdgeCount; i++)
{
int currentIndex = i;
int nextIndex = (i + 1) % outlineEdgeCount;
Edge current = edgesA[currentIndex];
Edge next = edgesA[nextIndex];
// Set point
outlinePoints[i] = current.point0.position;
// Set edge
outlineEdges[i * 2 + 0] = currentIndex;
if (current.point1 == next.point0)
{
outlineEdges[i * 2 + 1] = nextIndex;
}
else
{
outlineEdges[i * 2 + 1] = startIndex;
startIndex = nextIndex;
}
}
// Triangulate
int[] newEdges, newTriangles, newTriangleEdges;
ITriangulator triangulator = new Triangulator(outlinePoints, outlineEdges, planeNormal);
triangulator.Fill(out newEdges, out newTriangles, out newTriangleEdges);
// Calculate vertex properties
Vector3 normalA = -planeNormal;
Vector3 normalB = planeNormal;
Vector4[] tangentsA, tangentsB;
Vector2[] uvsA, uvsB;
uvMapper.Map(outlinePoints, planeNormal, out tangentsA, out tangentsB, out uvsA, out uvsB);
// Create new vertices
int[] verticesA = new int[outlineEdgeCount];
int[] verticesB = new int[outlineEdgeCount];
for (int i = 0; i < outlineEdgeCount; i++)
{
a.AddVertex(outlinePoints[i], normalA, tangentsA[i], uvsA[i], edgesA[i].point0, out verticesA[i]);
b.AddVertex(outlinePoints[i], normalB, tangentsB[i], uvsB[i], edgesB[i].point0, out verticesB[i]);
}
// Create new edges
for (int i = 0; i < newEdges.Length / 2; i++)
{
int point0 = newEdges[i * 2 + 0];
int point1 = newEdges[i * 2 + 1];
Edge edgeA = new Edge(edgesA[point0].point0, edgesA[point1].point0);
Edge edgeB = new Edge(edgesB[point0].point0, edgesB[point1].point0);
edgesA.Add(edgeA);
edgesB.Add(edgeB);
a.edges.Add(edgeA);
b.edges.Add(edgeB);
}
// Create new triangles
for (int i = 0; i < newTriangles.Length / 3; i++)
{
int point0 = newTriangles[i * 3 + 0];
int point1 = newTriangles[i * 3 + 1];
int point2 = newTriangles[i * 3 + 2];
int edge0 = newTriangleEdges[i * 3 + 0];
int edge1 = newTriangleEdges[i * 3 + 1];
int edge2 = newTriangleEdges[i * 3 + 2];
Triangle triangleA = new Triangle(verticesA[point0], verticesA[point2], verticesA[point1], edgesA[point0].point0, edgesA[point2].point0, edgesA[point1].point0, edgesA[edge2], edgesA[edge1], edgesA[edge0]);
Triangle triangleB = new Triangle(verticesB[point0], verticesB[point1], verticesB[point2], edgesB[point0].point0, edgesB[point1].point0, edgesB[point2].point0, edgesB[edge0], edgesB[edge1], edgesB[edge2]);
a.triangles.Add(triangleA);
b.triangles.Add(triangleB);
}
}
private void FillCutEdges(FastHull a, FastHull b, IList <Vector3> edges, Vector3 planeNormal, UvMapper uvMapper)
{
int edgeCount = edges.Count / 2;
List <Vector3> points = new List <Vector3>(edgeCount);
List <int> outline = new List <int>(edgeCount * 2);
int start = 0;
for (int current = 0; current < edgeCount; current++)
{
int next = current + 1;
// Find the next edge
int nearest = start;
float nearestDistance = (edges[current * 2 + 1] - edges[start * 2 + 0]).sqrMagnitude;
for (int other = next; other < edgeCount; other++)
{
float distance = (edges[current * 2 + 1] - edges[other * 2 + 0]).sqrMagnitude;
if (distance < nearestDistance)
{
nearest = other;
nearestDistance = distance;
}
}
// Is the current edge the last edge in this edge loop?
if (nearest == start && current > start)
{
int pointStart = points.Count;
int pointCounter = pointStart;
// Add this edge loop to the triangulation lists
for (int edge = start; edge < current; edge++)
{
points.Add(edges[edge * 2 + 0]);
outline.Add(pointCounter++);
outline.Add(pointCounter);
}
points.Add(edges[current * 2 + 0]);
outline.Add(pointCounter);
outline.Add(pointStart);
// Start a new edge loop
start = next;
}
else if (next < edgeCount)
{
// Move the nearest edge so that it follows the current edge
Vector3 n0 = edges[next * 2 + 0];
Vector3 n1 = edges[next * 2 + 1];
edges[next * 2 + 0] = edges[nearest * 2 + 0];
edges[next * 2 + 1] = edges[nearest * 2 + 1];
edges[nearest * 2 + 0] = n0;
edges[nearest * 2 + 1] = n1;
}
}
if (points.Count > 0)
{
// Triangulate the outline
int[] newEdges, newTriangles, newTriangleEdges;
ITriangulator triangulator = new Triangulator(points, outline, planeNormal);
triangulator.Fill(out newEdges, out newTriangles, out newTriangleEdges);
// Calculate the vertex properties
Vector3 normalA = -planeNormal;
Vector3 normalB = planeNormal;
Vector4[] tangentsA, tangentsB;
Vector2[] uvsA, uvsB;
uvMapper.Map(points, planeNormal, out tangentsA, out tangentsB, out uvsA, out uvsB);
// Add the new vertices
int offsetA = a.vertices.Count;
int offsetB = b.vertices.Count;
for (int i = 0; i < points.Count; i++)
{
a.vertices.Add(points[i]);
b.vertices.Add(points[i]);
}
if (normals != null)
{
for (int i = 0; i < points.Count; i++)
{
a.normals.Add(normalA);
b.normals.Add(normalB);
}
}
if (tangents != null)
{
for (int i = 0; i < points.Count; i++)
{
a.tangents.Add(tangentsA[i]);
b.tangents.Add(tangentsB[i]);
}
}
if (uvs != null)
{
for (int i = 0; i < points.Count; i++)
{
a.uvs.Add(uvsA[i]);
b.uvs.Add(uvsB[i]);
}
}
// Add the new triangles
int newTriangleCount = newTriangles.Length / 3;
for (int i = 0; i < newTriangleCount; i++)
{
a.indices.Add(offsetA + newTriangles[i * 3 + 0]);
a.indices.Add(offsetA + newTriangles[i * 3 + 2]);
a.indices.Add(offsetA + newTriangles[i * 3 + 1]);
b.indices.Add(offsetB + newTriangles[i * 3 + 0]);
b.indices.Add(offsetB + newTriangles[i * 3 + 1]);
b.indices.Add(offsetB + newTriangles[i * 3 + 2]);
}
}
}
