private List <Vector3> CreateRoad(Bounds bounds, int pointCount, Vector2[] clipPolygon)
{
// get offset, eg when biome mask is used for clipping
float xmin = bounds.center.x - bounds.extents.x;
float zmin = bounds.center.z - bounds.extents.z;
// get 0/0-based bounds for graph processing
Bounds graphBounds = new Bounds(bounds.size / 2, bounds.size);
DelaunayVoronoiGraph graph = new DelaunayVoronoiGraph();
// algorithm is 0-based
graph.GeneratePoints(0, bounds.size.x, bounds.size.z); // initialize with the dimensions which are used in the algorithm
// add random points
for (int i = 0; i < pointCount; i++)
{
// get random point starting at [0/0]
Vector2 vector = PolygonUtils.GetRandomPointXZ(graphBounds);
graph.AddPoint(vector.x, vector.y);
}
// create the graph using the points
graph.CreateGraph();
int cellIndex = Random.Range(0, pointCount - 1);
// normalize clip polygon, shift to [0/0]
Vector2[] offsetClipPolygon = clipPolygon.Select(item => new Vector2(item.x - xmin, item.y - zmin)).ToArray();
// get cell, clip it at the clip polygon
Cell cell = graph.GetVoronoiCell(cellIndex, offsetClipPolygon);
if (cell == null)
{
return(null);
}
// consider biome mask shift: shift points away from 0/0 if necessary
Vector3 position = new Vector3(cell.Centroid.x + xmin, 0, cell.Centroid.y + zmin); // TODO: recalculate, might have changed because of clipping
// consider biome mask shift: shift points away from 0/0 if necessary
List <Vector3> nodes = cell.Vertices.Select(item => new Vector3(item.x + xmin, 0, item.y + zmin)).ToList();
// apply random shape if requested
if (editor.extension.shapeSettings.randomShape)
{
nodes = ShapeCreator.CreateRandomShape(nodes, //
editor.extension.shapeSettings.RandomConvexity, //
editor.extension.shapeSettings.keepOriginalPoints, //
editor.extension.shapeSettings.RandomPointsCount, //
editor.extension.shapeSettings.randomAngle, //
editor.extension.shapeSettings.douglasPeuckerReductionTolerance);
}
return(nodes);
}
/// <summary>
/// Distributes random points within bounds and creates a convex hull around it.
/// </summary>
/// <param name="mask"></param>
/// <param name="bounds"></param>
/// <param name="count"></param>
public static List <Vector3> CreateRandomShapeUsingConvexHull(Bounds bounds, int count)
{
List <Vector2> points = new List <Vector2>();
for (int i = 0; i < count; i++)
{
points.Add(PolygonUtils.GetRandomPointXZ(bounds));
}
List <Vector2> convexHull = PolygonUtility.GetConvexHull(points);
List <Vector3> nodes = convexHull.ConvertAll <Vector3>(item => new Vector3(item.x, 0, item.y));
return(nodes);
}
