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GeoAlgorithmUtils.cs
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78 lines (72 loc) · 2.29 KB
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/********************************************************************************
** All rights reserved
** Auth： kay.yang
** E-mail: [email protected]
** Date： 6/30/2017 11:13:04 AM
** Version: v1.0.0
*********************************************************************************/
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using UnityEngine;
using KayMath;
namespace KayAlgorithm
{
public class GeoAlgorithmUtils
{
public static bool IsOnSamePlane(GeoPointsArray3 points, ref GeoPlane plane)
{
if (points.Size() < 4)
{
return true;
}
int count = points.Size();
int i = 2;
Vector3 p = points[0];
for (; i < count; ++i)
{
p = points[i];
if (!GeoLineUtils.IsPointInLine3(points[0], points[1], ref p))
{
break;
}
}
if (i == count)
{
return true;
}
plane = GeoPlaneUtils.CreateFromTriangle(points[0], points[1], p);
i = 2;
int c = 2;
for (; i < count; ++i)
{
if (GeoPlaneUtils.IsPointOnPlane(plane.mNormal, plane.mD, points[i]))
{
c++;
}
}
return c == count;
}
public static GeoPointsArray2 BuildConvexHull(GeoPointsArray2 points)
{
points.Distinct();
return new GeoPointsArray2(JarvisConvex.BuildHull(points.mPointArray));
}
public static GeoPointsArray3 BuildConvexHull(GeoPointsArray3 points)
{
points.Distinct();
GeoPlane plane = new GeoPlane(Vector3.zero, 0);
if (IsOnSamePlane(points, ref plane))
{
GeoPointsArray2 point2 = new GeoPointsArray2(GeoPlaneUtils.PlaneTransformLocal(points.mPointArray, plane));
point2 = BuildConvexHull(point2);
return new GeoPointsArray3(GeoPlaneUtils.PlaneTransformGlobal(point2.mPointArray, plane));
}
else
{
return new GeoPointsArray3(QuickHull.BuildHull(points));
}
}
}
}