/// <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);
}
/// <summary>
/// Transform the mask and convert it into its convex hull.
/// </summary>
/// <param name="mask"></param>
public static void ConvexHull(VegetationMaskArea mask)
{
Vector3 maskPosition = mask.transform.position;
List <Vector2> positionsXY = mask.Nodes.ConvertAll <Vector2>(item => new Vector2(item.Position.x, item.Position.z));
List <Vector2> convexHull = PolygonUtility.GetConvexHull(positionsXY);
mask.Nodes.Clear();
foreach (Vector2 nodePosition in convexHull)
{
mask.AddNodeToEnd(new Vector3(maskPosition.x + nodePosition.x, 0, maskPosition.z + nodePosition.y));
}
// center main handle, implicitly updates the mask
CenterMainHandle(mask);
}
public void GenerateHullNodes(float tolerance)
{
List <Vector2> worldSpacePointList = new List <Vector2>();
MeshFilter[] mersFilters = GetComponentsInChildren <MeshFilter>();
for (int i = 0; i <= mersFilters.Length - 1; i++)
{
Mesh mesh = mersFilters[i].sharedMesh;
if (mesh)
{
List <Vector3> verticeList = new List <Vector3>();
mesh.GetVertices(verticeList);
for (int j = 0; j <= verticeList.Count - 1; j++)
{
Vector3 worldSpacePosition = mersFilters[i].transform.TransformPoint(verticeList[j]);
Vector2 worldSpacePoint = new Vector2
{
x = worldSpacePosition.x,
y = worldSpacePosition.z
};
worldSpacePointList.Add(worldSpacePoint);
}
}
}
List <Vector2> hullPointList = PolygonUtility.GetConvexHull(worldSpacePointList);
List <Vector2> reducedPointList = PolygonUtility.DouglasPeuckerReduction(hullPointList, tolerance);
if (reducedPointList.Count >= 3)
{
ClearNodes();
for (int i = 0; i <= reducedPointList.Count - 1; i++)
{
Vector3 worldSpacePosition = new Vector3(reducedPointList[i].x, 0, reducedPointList[i].y);
AddNode(worldSpacePosition);
}
PositionNodes();
}
}