// Triangle creation
public void AddTriangle(Vector3 v1, Vector3 v2, Vector3 v3)
{
int vertexIndex = _vertices.Count;
_vertices.Add(VoronoiMetrics.Perturb(v1));
_vertices.Add(VoronoiMetrics.Perturb(v2));
_vertices.Add(VoronoiMetrics.Perturb(v3));
_triangles.Add(vertexIndex);
_triangles.Add(vertexIndex + 1);
_triangles.Add(vertexIndex + 2);
}
private void TriangulateCornerCliffTerraces(
Vector3 begin, VoronoiCell beginCell,
Vector3 left, VoronoiCell leftCell,
Vector3 right, VoronoiCell rightCell)
{
float b = 1f / (leftCell.Elevation - beginCell.Elevation);
b = b < 0 ? -b : b;
Vector3 boundary = Vector3.Lerp(VoronoiMetrics.Perturb(begin), VoronoiMetrics.Perturb(left), b);
Color boundaryColor = Color.Lerp(beginCell.Color, leftCell.Color, b);
TriangulateBoundaryTriangle(right, rightCell, begin, beginCell, boundary, boundaryColor);
if (leftCell.GetEdgeType(rightCell) == VoronoiEdgeType.Slope)
{
TriangulateBoundaryTriangle(left, leftCell, right, rightCell, boundary, boundaryColor);
}
else
{
Terrain.AddTriangleUnperturbed(VoronoiMetrics.Perturb(left), VoronoiMetrics.Perturb(right), boundary);
Terrain.AddTriangleColor(leftCell.Color, rightCell.Color, boundaryColor);
}
}
private void TriangulateBoundaryTriangle(
Vector3 begin, VoronoiCell beginCell,
Vector3 left, VoronoiCell leftCell,
Vector3 boundary, Color boundaryColor)
{
Vector3 v2 = VoronoiMetrics.Perturb(VoronoiMetrics.TerraceLerp(begin, left, 1));
Color c2 = VoronoiMetrics.TerraceLerp(beginCell.Color, leftCell.Color, 1);
Terrain.AddTriangleUnperturbed(VoronoiMetrics.Perturb(begin), v2, boundary);
Terrain.AddTriangleColor(beginCell.Color, c2, boundaryColor);
for (int i = 2; i < VoronoiMetrics.TerraceSteps; ++i)
{
Vector3 v1 = v2;
Color c1 = c2;
v2 = VoronoiMetrics.Perturb(VoronoiMetrics.TerraceLerp(begin, left, i));
c2 = VoronoiMetrics.TerraceLerp(beginCell.Color, leftCell.Color, i);
Terrain.AddTriangleUnperturbed(v1, v2, boundary);
Terrain.AddTriangleColor(c1, c2, boundaryColor);
}
Terrain.AddTriangleUnperturbed(v2, VoronoiMetrics.Perturb(left), boundary);
Terrain.AddTriangleColor(c2, leftCell.Color, boundaryColor);
}
