forked from BilalY/Rasagar
605 lines
26 KiB
C#
605 lines
26 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using Cinemachine.Utility;
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using UnityEngine;
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namespace Cinemachine
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{
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using IntPoint = ClipperLib.IntPoint;
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using Clipper = ClipperLib.Clipper;
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using ClipperOffset = ClipperLib.ClipperOffset;
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using ClipperBase = ClipperLib.ClipperBase;
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using IntRect = ClipperLib.IntRect;
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using JoinType = ClipperLib.JoinType;
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using EndType = ClipperLib.EndType;
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using PolyType = ClipperLib.PolyType;
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using PolyFillType = ClipperLib.PolyFillType;
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using ClipType = ClipperLib.ClipType;
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/// <summary>
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/// Responsible for baking confiners via BakeConfiner function.
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/// </summary>
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class ConfinerOven
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{
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public class BakedSolution
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{
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float m_FrustumSizeIntSpace;
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readonly AspectStretcher m_AspectStretcher;
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readonly bool m_HasBones;
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readonly double m_SqrPolygonDiagonal;
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List<List<IntPoint>> m_OriginalPolygon;
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List<List<IntPoint>> m_Solution;
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const double k_ClipperEpsilon = 0.01f * k_FloatToIntScaler;
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public BakedSolution(
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float aspectRatio, float frustumHeight, bool hasBones, Rect polygonBounds,
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List<List<IntPoint>> originalPolygon, List<List<IntPoint>> solution)
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{
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m_AspectStretcher = new AspectStretcher(aspectRatio, polygonBounds.center.x);
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m_FrustumSizeIntSpace = frustumHeight * k_FloatToIntScaler;
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m_HasBones = hasBones;
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m_OriginalPolygon = originalPolygon;
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m_Solution = solution;
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float polygonSizeX = polygonBounds.width / aspectRatio * k_FloatToIntScaler;
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float polygonSizeY = polygonBounds.height * k_FloatToIntScaler;
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m_SqrPolygonDiagonal = polygonSizeX * polygonSizeX + polygonSizeY * polygonSizeY;
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}
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public bool IsValid() => m_Solution != null;
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public Vector2 ConfinePoint(in Vector2 pointToConfine)
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{
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if (m_Solution.Count <= 0) return pointToConfine; // empty confiner -> no need to confine
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Vector2 pInConfinerSpace = m_AspectStretcher.Stretch(pointToConfine);
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IntPoint p =
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new IntPoint(pInConfinerSpace.x * k_FloatToIntScaler, pInConfinerSpace.y * k_FloatToIntScaler);
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for (int i = 0; i < m_Solution.Count; ++i)
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{
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if (Clipper.PointInPolygon(p, m_Solution[i]) != 0) // 0: outside, +1: inside , -1: point on poly boundary
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{
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return pointToConfine; // inside, no confinement needed
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}
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}
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// If the poly has bones and if the position to confine is not outside of the original
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// bounding shape, then it is possible that the bone in a neighbouring section
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// is closer than the bone in the correct section of the polygon, if the current section
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// is very large and the neighbouring section is small. In that case, we'll need to
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// add an extra check when calculating the nearest point.
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bool checkIntersectOriginal = m_HasBones && IsInsideOriginal(p);
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// Confine point
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IntPoint closest = p;
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double minDistance = double.MaxValue;
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for (int i = 0; i < m_Solution.Count; ++i)
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{
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int numPoints = m_Solution[i].Count;
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for (int j = 0; j < numPoints; ++j)
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{
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IntPoint l1 = m_Solution[i][j];
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IntPoint l2 = m_Solution[i][(j + 1) % numPoints];
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IntPoint c = IntPointLerp(l1, l2, ClosestPointOnSegment(p, l1, l2));
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double diffX = Mathf.Abs(p.X - c.X);
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double diffY = Mathf.Abs(p.Y - c.Y);
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double distance = diffX * diffX + diffY * diffY;
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// penalty for points from which the target is not visible, preferring visibility over proximity
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if (diffX > m_FrustumSizeIntSpace || diffY > m_FrustumSizeIntSpace)
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{
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distance += m_SqrPolygonDiagonal; // penalty is the biggest distance between any two points
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}
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if (distance < minDistance && (!checkIntersectOriginal || !DoesIntersectOriginal(p, c)))
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{
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minDistance = distance;
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closest = c;
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}
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}
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}
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var result = new Vector2(closest.X * k_IntToFloatScaler, closest.Y * k_IntToFloatScaler);
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return m_AspectStretcher.Unstretch(result);
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// local functions
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IntPoint IntPointLerp(IntPoint a, IntPoint b, float lerp)
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{
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return new IntPoint
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{
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X = Mathf.RoundToInt(a.X + (b.X - a.X) * lerp),
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Y = Mathf.RoundToInt(a.Y + (b.Y - a.Y) * lerp),
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};
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}
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bool IsInsideOriginal(IntPoint point) =>
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m_OriginalPolygon.Any(t => Clipper.PointInPolygon(point, t) != 0);
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float ClosestPointOnSegment(IntPoint point, IntPoint s0, IntPoint s1)
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{
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double sX = s1.X - s0.X;
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double sY = s1.Y - s0.Y;
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var len2 = sX * sX + sY * sY;
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if (len2 < k_ClipperEpsilon)
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return 0; // degenerate segment
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double s0pX = point.X - s0.X;
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double s0pY = point.Y - s0.Y;
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var dot = s0pX * sX + s0pY * sY;
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return Mathf.Clamp01((float) (dot / len2));
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}
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bool DoesIntersectOriginal(IntPoint l1, IntPoint l2)
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{
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foreach (var original in m_OriginalPolygon)
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{
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var numPoints = original.Count;
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for (var i = 0; i < numPoints; ++i)
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{
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if (FindIntersection(l1, l2, original[i], original[(i + 1) % numPoints]) == 2)
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{
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return true;
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}
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}
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}
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return false;
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}
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}
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#if UNITY_EDITOR
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// Used by inspector to draw the baked path
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List<List<Vector2>> m_Vector2Path;
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public List<List<Vector2>> GetBakedPath()
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{
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// Convert to client space
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var numPaths = m_Solution.Count;
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if (m_Vector2Path == null)
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{
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m_Vector2Path = new List<List<Vector2>>(numPaths);
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for (int i = 0; i < numPaths; ++i)
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{
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var srcPoly = m_Solution[i];
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int numPoints = srcPoly.Count;
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var pathSegment = new List<Vector2>(numPoints);
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for (int j = 0; j < numPoints; j++)
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{
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// Restore the original aspect ratio
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pathSegment.Add(m_AspectStretcher.Unstretch(
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new Vector2(srcPoly[j].X, srcPoly[j].Y) * k_IntToFloatScaler));
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}
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m_Vector2Path.Add(pathSegment);
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}
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}
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return m_Vector2Path;
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}
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#endif
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static int FindIntersection(in IntPoint p1, in IntPoint p2, in IntPoint p3, in IntPoint p4)
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{
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// Get the segments' parameters.
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double dx12 = p2.X - p1.X;
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double dy12 = p2.Y - p1.Y;
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double dx34 = p4.X - p3.X;
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double dy34 = p4.Y - p3.Y;
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// Solve for t1 and t2
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double denominator = dy12 * dx34 - dx12 * dy34;
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double t1 =
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((p1.X - p3.X) * dy34 + (p3.Y - p1.Y) * dx34)
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/ denominator;
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if (double.IsInfinity(t1) || double.IsNaN(t1))
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{
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// The lines are parallel (or close enough to it).
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if (IntPointDiffSqrMagnitude(p1, p3) < k_ClipperEpsilon ||
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IntPointDiffSqrMagnitude(p1, p4) < k_ClipperEpsilon ||
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IntPointDiffSqrMagnitude(p2, p3) < k_ClipperEpsilon ||
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IntPointDiffSqrMagnitude(p2, p4) < k_ClipperEpsilon)
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{
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return 2; // they are the same line, or very close parallels
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}
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return 0; // no intersection
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}
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double t2 = ((p3.X - p1.X) * dy12 + (p1.Y - p3.Y) * dx12) / -denominator;
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return (t1 >= 0 && t1 <= 1 && t2 >= 0 && t2 < 1) ? 2 : 1; // 2 = segments intersect, 1 = lines intersect
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// local function
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double IntPointDiffSqrMagnitude(IntPoint point1, IntPoint point2)
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{
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double x = point1.X - point2.X;
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double y = point1.Y - point2.Y;
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return x * x + y * y;
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}
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}
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}
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readonly struct AspectStretcher
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{
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public float Aspect { get; }
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readonly float m_InverseAspect;
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readonly float m_CenterX;
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public AspectStretcher(float aspect, float centerX)
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{
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Aspect = aspect;
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m_InverseAspect = 1 / Aspect;
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m_CenterX = centerX;
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}
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public Vector2 Stretch(Vector2 p) => new Vector2((p.x - m_CenterX) * m_InverseAspect + m_CenterX, p.y);
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public Vector2 Unstretch(Vector2 p) => new Vector2((p.x - m_CenterX) * Aspect + m_CenterX, p.y);
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}
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float m_MinFrustumHeightWithBones;
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List<List<IntPoint>> m_OriginalPolygon;
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IntPoint m_MidPoint;
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List<List<IntPoint>> m_Skeleton = new List<List<IntPoint>>();
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const long k_FloatToIntScaler = 100000;
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const float k_IntToFloatScaler = 1.0f / k_FloatToIntScaler;
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const float k_MinStepSize = 0.005f;
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Rect m_PolygonRect;
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AspectStretcher m_AspectStretcher = new AspectStretcher(1, 0);
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float m_MaxComputationTimeForFullSkeletonBakeInSeconds = 5f;
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public ConfinerOven(in List<List<Vector2>> inputPath, in float aspectRatio, float maxFrustumHeight)
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{
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Initialize(inputPath, aspectRatio, maxFrustumHeight);
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}
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/// <summary>
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/// Converts and returns a prebaked ConfinerState for the input frustumHeight.
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/// </summary>
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public BakedSolution GetBakedSolution(float frustumHeight)
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{
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// If the user has set a max frustum height, respect it
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frustumHeight = m_Cache.userSetMaxFrustumHeight <= 0
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? frustumHeight
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: Mathf.Min(m_Cache.userSetMaxFrustumHeight, frustumHeight);
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// Special case: we are shrank to the mid point of the original input confiner area.
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if (State == BakingState.BAKED && frustumHeight > m_Cache.theoriticalMaxFrustumHeight)
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{
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return new BakedSolution(
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m_AspectStretcher.Aspect, frustumHeight, false,
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m_PolygonRect, m_OriginalPolygon,
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new List<List<IntPoint>>{new List<IntPoint> { m_MidPoint }});
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}
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// Inflate with clipper to frustumHeight
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var offsetter = new ClipperOffset();
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offsetter.AddPaths(m_OriginalPolygon, JoinType.jtMiter, EndType.etClosedPolygon);
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var solution = new List<List<IntPoint>>();
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offsetter.Execute(ref solution, -1f * frustumHeight * k_FloatToIntScaler);
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// Add in the skeleton
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var bakedSolution = new List<List<IntPoint>>();
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if (State == BakingState.BAKING || m_Skeleton.Count == 0)
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{
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bakedSolution = solution;
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}
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else
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{
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var c = new Clipper();
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c.AddPaths(solution, PolyType.ptSubject, true);
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c.AddPaths(m_Skeleton, PolyType.ptClip, true);
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c.Execute(ClipType.ctUnion, bakedSolution, PolyFillType.pftEvenOdd, PolyFillType.pftEvenOdd);
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}
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return new BakedSolution(
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m_AspectStretcher.Aspect, frustumHeight,
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m_MinFrustumHeightWithBones < frustumHeight,
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m_PolygonRect, m_OriginalPolygon, bakedSolution);
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}
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struct PolygonSolution
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{
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public List<List<IntPoint>> polygons;
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public float frustumHeight;
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public bool StateChanged(in List<List<IntPoint>> paths)
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{
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if (paths.Count != polygons.Count)
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return true;
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for (var i = 0; i < paths.Count; ++i)
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{
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if (paths[i].Count != polygons[i].Count)
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return true;
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}
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return false;
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}
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public bool IsNull => polygons == null;
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}
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public enum BakingState
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{
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BAKING, BAKED, TIMEOUT
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}
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public BakingState State { get; private set; }
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public float bakeProgress;
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struct BakingStateCache
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{
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public ClipperOffset offsetter;
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public List<PolygonSolution> solutions;
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public PolygonSolution rightCandidate;
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public PolygonSolution leftCandidate;
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public List<List<IntPoint>> maxCandidate;
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public float stepSize;
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public float maxFrustumHeight;
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public float userSetMaxFrustumHeight;
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public float theoriticalMaxFrustumHeight;
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public float currentFrustumHeight;
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public float bakeTime;
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}
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BakingStateCache m_Cache;
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void Initialize(in List<List<Vector2>> inputPath, in float aspectRatio, float maxFrustumHeight)
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{
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m_Skeleton.Clear();
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m_Cache.userSetMaxFrustumHeight = maxFrustumHeight;
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m_MinFrustumHeightWithBones = float.MaxValue;
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// calculate mid point and use it as the most shrank down version
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|
|
m_PolygonRect = GetPolygonBoundingBox(inputPath);
|
||
|
|
m_AspectStretcher = new AspectStretcher(aspectRatio, m_PolygonRect.center.x);
|
||
|
|
|
||
|
|
// Don't compute further than what is the theoretical max
|
||
|
|
m_Cache.theoriticalMaxFrustumHeight = Mathf.Max(m_PolygonRect.width / aspectRatio, m_PolygonRect.height) / 2f;
|
||
|
|
|
||
|
|
// Initialize clipper
|
||
|
|
m_OriginalPolygon = new List<List<IntPoint>>(inputPath.Count);
|
||
|
|
for (var i = 0; i < inputPath.Count; ++i)
|
||
|
|
{
|
||
|
|
var srcPath = inputPath[i];
|
||
|
|
var numPoints = srcPath.Count;
|
||
|
|
var path = new List<IntPoint>(numPoints);
|
||
|
|
for (var j = 0; j < numPoints; ++j)
|
||
|
|
{
|
||
|
|
// Neutralize the aspect ratio
|
||
|
|
var p = m_AspectStretcher.Stretch(srcPath[j]);
|
||
|
|
path.Add(new IntPoint(p.x * k_FloatToIntScaler, p.y * k_FloatToIntScaler));
|
||
|
|
}
|
||
|
|
m_OriginalPolygon.Add(path);
|
||
|
|
}
|
||
|
|
m_MidPoint = MidPointOfIntRect(ClipperBase.GetBounds(m_OriginalPolygon));
|
||
|
|
|
||
|
|
// Skip the expensive skeleton calculation if it's not wanted (oversized window off)
|
||
|
|
if (m_Cache.userSetMaxFrustumHeight < 0)
|
||
|
|
{
|
||
|
|
State = BakingState.BAKED; // if we don't need skeleton, then we don't need to bake
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
// exact comparison to 0 is intentional!
|
||
|
|
m_Cache.maxFrustumHeight = m_Cache.userSetMaxFrustumHeight;
|
||
|
|
if (m_Cache.maxFrustumHeight == 0 || m_Cache.maxFrustumHeight > m_Cache.theoriticalMaxFrustumHeight)
|
||
|
|
{
|
||
|
|
m_Cache.maxFrustumHeight = m_Cache.theoriticalMaxFrustumHeight;
|
||
|
|
}
|
||
|
|
m_Cache.stepSize = m_Cache.maxFrustumHeight;
|
||
|
|
|
||
|
|
// Binary search for state changes so we can compute the skeleton
|
||
|
|
m_Cache.offsetter = new ClipperOffset();
|
||
|
|
m_Cache.offsetter.AddPaths(m_OriginalPolygon, JoinType.jtMiter, EndType.etClosedPolygon);
|
||
|
|
|
||
|
|
var solution = new List<List<IntPoint>>();
|
||
|
|
m_Cache.offsetter.Execute(ref solution, 0);
|
||
|
|
|
||
|
|
m_Cache.solutions = new List<PolygonSolution>();
|
||
|
|
m_Cache.solutions.Add(new PolygonSolution
|
||
|
|
{
|
||
|
|
polygons = solution,
|
||
|
|
frustumHeight = 0,
|
||
|
|
});
|
||
|
|
|
||
|
|
m_Cache.rightCandidate = new PolygonSolution();
|
||
|
|
m_Cache.leftCandidate = new PolygonSolution
|
||
|
|
{
|
||
|
|
polygons = solution,
|
||
|
|
frustumHeight = 0,
|
||
|
|
};
|
||
|
|
m_Cache.currentFrustumHeight = 0;
|
||
|
|
m_Cache.maxCandidate = new List<List<IntPoint>>();
|
||
|
|
m_Cache.offsetter.Execute(ref m_Cache.maxCandidate, -1f * m_Cache.theoriticalMaxFrustumHeight * k_FloatToIntScaler);
|
||
|
|
|
||
|
|
m_Cache.bakeTime = 0;
|
||
|
|
State = BakingState.BAKING;
|
||
|
|
bakeProgress = 0;
|
||
|
|
|
||
|
|
// local functions
|
||
|
|
Rect GetPolygonBoundingBox(in List<List<Vector2>> polygons)
|
||
|
|
{
|
||
|
|
float minX = float.PositiveInfinity, maxX = float.NegativeInfinity;
|
||
|
|
float minY = float.PositiveInfinity, maxY = float.NegativeInfinity;
|
||
|
|
for (var i = 0; i < polygons.Count; ++i)
|
||
|
|
{
|
||
|
|
for (var j = 0; j < polygons[i].Count; ++j)
|
||
|
|
{
|
||
|
|
var p = polygons[i][j];
|
||
|
|
minX = Mathf.Min(minX, p.x);
|
||
|
|
maxX = Mathf.Max(maxX, p.x);
|
||
|
|
minY = Mathf.Min(minY, p.y);
|
||
|
|
maxY = Mathf.Max(maxY, p.y);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return new Rect(minX, minY, Mathf.Max(0, maxX - minX), Mathf.Max(0, maxY - minY));
|
||
|
|
}
|
||
|
|
|
||
|
|
IntPoint MidPointOfIntRect(IntRect bounds) =>
|
||
|
|
new IntPoint((bounds.left + bounds.right) / 2, (bounds.top + bounds.bottom) / 2);
|
||
|
|
}
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// Creates shrinkable polygons from input parameters.
|
||
|
|
/// The algorithm is divide and conquer. It iteratively shrinks down the input
|
||
|
|
/// polygon towards its shrink directions. If the polygon intersects with itself,
|
||
|
|
/// then we divide the polygon into two polygons at the intersection point, and
|
||
|
|
/// continue the algorithm on these two polygons separately. We need to keep track of
|
||
|
|
/// the connectivity information between sub-polygons.
|
||
|
|
/// </summary>
|
||
|
|
public void BakeConfiner(float maxComputationTimePerFrameInSeconds)
|
||
|
|
{
|
||
|
|
if (State != BakingState.BAKING)
|
||
|
|
return;
|
||
|
|
|
||
|
|
var startTime = Time.realtimeSinceStartup;
|
||
|
|
|
||
|
|
while (m_Cache.solutions.Count < 1000)
|
||
|
|
{
|
||
|
|
var numPaths = m_Cache.leftCandidate.polygons.Count;
|
||
|
|
var candidate = new List<List<IntPoint>>(numPaths);
|
||
|
|
|
||
|
|
m_Cache.stepSize = Mathf.Min(m_Cache.stepSize,
|
||
|
|
m_Cache.maxFrustumHeight - m_Cache.leftCandidate.frustumHeight);
|
||
|
|
#if false
|
||
|
|
Debug.Log($"States = {solutions.Count}, "
|
||
|
|
+ $"Frustum height = {currentFrustumHeight}, stepSize = {stepSize}");
|
||
|
|
#endif
|
||
|
|
m_Cache.currentFrustumHeight =
|
||
|
|
m_Cache.leftCandidate.frustumHeight + m_Cache.stepSize;
|
||
|
|
if (Math.Abs(m_Cache.currentFrustumHeight - m_Cache.maxFrustumHeight) <
|
||
|
|
UnityVectorExtensions.Epsilon)
|
||
|
|
{
|
||
|
|
candidate = m_Cache.maxCandidate;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
m_Cache.offsetter.Execute(
|
||
|
|
ref candidate, -1f * m_Cache.currentFrustumHeight * k_FloatToIntScaler);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (m_Cache.leftCandidate.StateChanged(in candidate))
|
||
|
|
{
|
||
|
|
m_Cache.rightCandidate = new PolygonSolution
|
||
|
|
{
|
||
|
|
polygons = candidate,
|
||
|
|
frustumHeight = m_Cache.currentFrustumHeight,
|
||
|
|
};
|
||
|
|
m_Cache.stepSize = Mathf.Max(m_Cache.stepSize / 2f, k_MinStepSize);
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
m_Cache.leftCandidate = new PolygonSolution
|
||
|
|
{
|
||
|
|
polygons = candidate,
|
||
|
|
frustumHeight = m_Cache.currentFrustumHeight,
|
||
|
|
};
|
||
|
|
|
||
|
|
// if we have not found right yet, then we don't need to decrease stepsize
|
||
|
|
if (!m_Cache.rightCandidate.IsNull)
|
||
|
|
{
|
||
|
|
m_Cache.stepSize = Mathf.Max(m_Cache.stepSize / 2f, k_MinStepSize);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// if we have a right candidate, and left and right are sufficiently close,
|
||
|
|
// then we have located a state change point
|
||
|
|
if (!m_Cache.rightCandidate.IsNull && m_Cache.stepSize <= k_MinStepSize)
|
||
|
|
{
|
||
|
|
// Add both states: one before the state change and one after
|
||
|
|
m_Cache.solutions.Add(m_Cache.leftCandidate);
|
||
|
|
m_Cache.solutions.Add(m_Cache.rightCandidate);
|
||
|
|
|
||
|
|
m_Cache.leftCandidate = m_Cache.rightCandidate;
|
||
|
|
m_Cache.rightCandidate = new PolygonSolution();
|
||
|
|
|
||
|
|
// Back to max step
|
||
|
|
m_Cache.stepSize = m_Cache.maxFrustumHeight;
|
||
|
|
}
|
||
|
|
else if (m_Cache.rightCandidate.IsNull ||
|
||
|
|
m_Cache.leftCandidate.frustumHeight >= m_Cache.maxFrustumHeight)
|
||
|
|
{
|
||
|
|
m_Cache.solutions.Add(m_Cache.leftCandidate);
|
||
|
|
break; // stop searching, because we are at the bound
|
||
|
|
}
|
||
|
|
|
||
|
|
// Pause after max time per iteration reached
|
||
|
|
var elapsedTime = Time.realtimeSinceStartup - startTime;
|
||
|
|
if (elapsedTime > maxComputationTimePerFrameInSeconds)
|
||
|
|
{
|
||
|
|
m_Cache.bakeTime += elapsedTime;
|
||
|
|
if (m_Cache.bakeTime > m_MaxComputationTimeForFullSkeletonBakeInSeconds)
|
||
|
|
{
|
||
|
|
State = BakingState.TIMEOUT;
|
||
|
|
}
|
||
|
|
|
||
|
|
bakeProgress = m_Cache.leftCandidate.frustumHeight / m_Cache.maxFrustumHeight;
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
ComputeSkeleton(in m_Cache.solutions);
|
||
|
|
|
||
|
|
// Remove useless/empty results
|
||
|
|
for (var i = m_Cache.solutions.Count - 1; i >= 0; --i)
|
||
|
|
{
|
||
|
|
if (m_Cache.solutions[i].polygons.Count == 0)
|
||
|
|
{
|
||
|
|
m_Cache.solutions.RemoveAt(i);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
bakeProgress = 1;
|
||
|
|
State = BakingState.BAKED;
|
||
|
|
|
||
|
|
void ComputeSkeleton(in List<PolygonSolution> solutions)
|
||
|
|
{
|
||
|
|
// At each state change point, collect geometry that gets lost over the transition
|
||
|
|
var clipper = new Clipper();
|
||
|
|
var offsetter = new ClipperOffset();
|
||
|
|
for (int i = 1; i < solutions.Count - 1; i += 2)
|
||
|
|
{
|
||
|
|
var prev = solutions[i];
|
||
|
|
var next = solutions[i+1];
|
||
|
|
|
||
|
|
const int padding = 5; // to counteract precision problems - inflates small regions
|
||
|
|
double step = padding * k_FloatToIntScaler * (next.frustumHeight - prev.frustumHeight);
|
||
|
|
|
||
|
|
// Grow the larger polygon to inflate marginal regions
|
||
|
|
var expandedPrev = new List<List<IntPoint>>();
|
||
|
|
offsetter.Clear();
|
||
|
|
offsetter.AddPaths(prev.polygons, JoinType.jtMiter, EndType.etClosedPolygon);
|
||
|
|
offsetter.Execute(ref expandedPrev, step);
|
||
|
|
|
||
|
|
// Grow the smaller polygon to be a bit bigger than the expanded larger one
|
||
|
|
var expandedNext = new List<List<IntPoint>>();
|
||
|
|
offsetter.Clear();
|
||
|
|
offsetter.AddPaths(next.polygons, JoinType.jtMiter, EndType.etClosedPolygon);
|
||
|
|
offsetter.Execute(ref expandedNext, step * 2);
|
||
|
|
|
||
|
|
// Compute the difference - this is the lost geometry
|
||
|
|
var solution = new List<List<IntPoint>>();
|
||
|
|
clipper.Clear();
|
||
|
|
clipper.AddPaths(expandedPrev, PolyType.ptSubject, true);
|
||
|
|
clipper.AddPaths(expandedNext, PolyType.ptClip, true);
|
||
|
|
clipper.Execute(ClipType.ctDifference, solution, PolyFillType.pftEvenOdd, PolyFillType.pftEvenOdd);
|
||
|
|
|
||
|
|
// Add that lost geometry to the skeleton
|
||
|
|
if (solution.Count > 0 && solution[0].Count > 0)
|
||
|
|
{
|
||
|
|
m_Skeleton.AddRange(solution);
|
||
|
|
// Exact comparison is intentional
|
||
|
|
if (m_MinFrustumHeightWithBones == float.MaxValue)
|
||
|
|
m_MinFrustumHeightWithBones = next.frustumHeight;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|