forked from mirror/DotRecast
move utils
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ikpil
parent
c333ef7ce6
commit
af6c804330
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/*
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Copyright (c) 2009-2010 Mikko Mononen memon@inside.org
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recast4j copyright (c) 2015-2019 Piotr Piastucki piotr@jtilia.org
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DotRecast Copyright (c) 2023 Choi Ikpil ikpil@naver.com
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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using System;
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using System.Collections.Generic;
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using DotRecast.Core;
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namespace DotRecast.Detour
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{
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public static class PathUtils
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{
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private const int MAX_STEER_POINTS = 3;
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public static SteerTarget getSteerTarget(NavMeshQuery navQuery, Vector3f startPos, Vector3f endPos,
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float minTargetDist, List<long> path)
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{
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// Find steer target.
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Result<List<StraightPathItem>> result = navQuery.findStraightPath(startPos, endPos, path, MAX_STEER_POINTS, 0);
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if (result.failed())
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{
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return null;
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}
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List<StraightPathItem> straightPath = result.result;
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float[] steerPoints = new float[straightPath.Count * 3];
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for (int i = 0; i < straightPath.Count; i++)
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{
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steerPoints[i * 3] = straightPath[i].getPos()[0];
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steerPoints[i * 3 + 1] = straightPath[i].getPos()[1];
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steerPoints[i * 3 + 2] = straightPath[i].getPos()[2];
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}
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// Find vertex far enough to steer to.
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int ns = 0;
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while (ns < straightPath.Count)
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{
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// Stop at Off-Mesh link or when point is further than slop away.
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if (((straightPath[ns].getFlags() & NavMeshQuery.DT_STRAIGHTPATH_OFFMESH_CONNECTION) != 0)
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|| !inRange(straightPath[ns].getPos(), startPos, minTargetDist, 1000.0f))
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break;
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ns++;
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}
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// Failed to find good point to steer to.
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if (ns >= straightPath.Count)
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return null;
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Vector3f steerPos = Vector3f.Of(
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straightPath[ns].getPos()[0],
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startPos[1],
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straightPath[ns].getPos()[2]
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);
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int steerPosFlag = straightPath[ns].getFlags();
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long steerPosRef = straightPath[ns].getRef();
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SteerTarget target = new SteerTarget(steerPos, steerPosFlag, steerPosRef, steerPoints);
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return target;
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}
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public static bool inRange(Vector3f v1, Vector3f v2, float r, float h)
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{
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float dx = v2[0] - v1[0];
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float dy = v2[1] - v1[1];
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float dz = v2[2] - v1[2];
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return (dx * dx + dz * dz) < r * r && Math.Abs(dy) < h;
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}
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public static List<long> fixupCorridor(List<long> path, List<long> visited)
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{
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int furthestPath = -1;
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int furthestVisited = -1;
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// Find furthest common polygon.
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for (int i = path.Count - 1; i >= 0; --i)
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{
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bool found = false;
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for (int j = visited.Count - 1; j >= 0; --j)
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{
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if (path[i] == visited[j])
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{
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furthestPath = i;
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furthestVisited = j;
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found = true;
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}
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}
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if (found)
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break;
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}
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// If no intersection found just return current path.
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if (furthestPath == -1 || furthestVisited == -1)
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return path;
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// Concatenate paths.
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// Adjust beginning of the buffer to include the visited.
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int req = visited.Count - furthestVisited;
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int orig = Math.Min(furthestPath + 1, path.Count);
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int size = Math.Max(0, path.Count - orig);
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List<long> fixupPath = new List<long>();
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// Store visited
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for (int i = 0; i < req; ++i)
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{
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fixupPath.Add(visited[(visited.Count - 1) - i]);
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}
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for (int i = 0; i < size; i++)
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{
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fixupPath.Add(path[orig + i]);
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}
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return fixupPath;
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}
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// This function checks if the path has a small U-turn, that is,
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// a polygon further in the path is adjacent to the first polygon
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// in the path. If that happens, a shortcut is taken.
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// This can happen if the target (T) location is at tile boundary,
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// and we're (S) approaching it parallel to the tile edge.
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// The choice at the vertex can be arbitrary,
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// +---+---+
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// |:::|:::|
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// +-S-+-T-+
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// |:::| | <-- the step can end up in here, resulting U-turn path.
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// +---+---+
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public static List<long> fixupShortcuts(List<long> path, NavMeshQuery navQuery)
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{
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if (path.Count < 3)
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{
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return path;
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}
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// Get connected polygons
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List<long> neis = new List<long>();
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Result<Tuple<MeshTile, Poly>> tileAndPoly = navQuery.getAttachedNavMesh().getTileAndPolyByRef(path[0]);
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if (tileAndPoly.failed())
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{
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return path;
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}
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MeshTile tile = tileAndPoly.result.Item1;
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Poly poly = tileAndPoly.result.Item2;
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for (int k = tile.polyLinks[poly.index]; k != NavMesh.DT_NULL_LINK; k = tile.links[k].next)
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{
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Link link = tile.links[k];
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if (link.refs != 0)
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{
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neis.Add(link.refs);
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}
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}
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// If any of the neighbour polygons is within the next few polygons
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// in the path, short cut to that polygon directly.
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int maxLookAhead = 6;
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int cut = 0;
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for (int i = Math.Min(maxLookAhead, path.Count) - 1; i > 1 && cut == 0; i--)
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{
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for (int j = 0; j < neis.Count; j++)
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{
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if (path[i] == neis[j])
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{
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cut = i;
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break;
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}
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}
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}
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if (cut > 1)
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{
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List<long> shortcut = new List<long>();
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shortcut.Add(path[0]);
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shortcut.AddRange(path.GetRange(cut, path.Count - cut));
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return shortcut;
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}
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return path;
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}
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}
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}
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@ -0,0 +1,20 @@
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using DotRecast.Core;
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namespace DotRecast.Detour
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{
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public class SteerTarget
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{
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public readonly Vector3f steerPos;
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public readonly int steerPosFlag;
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public readonly long steerPosRef;
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public readonly float[] steerPoints;
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public SteerTarget(Vector3f steerPos, int steerPosFlag, long steerPosRef, float[] steerPoints)
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{
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this.steerPos = steerPos;
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this.steerPosFlag = steerPosFlag;
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this.steerPosRef = steerPosRef;
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this.steerPoints = steerPoints;
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}
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}
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}
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@ -5,7 +5,7 @@
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</PropertyGroup>
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<ItemGroup>
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<ProjectReference Include="..\DotRecast.Core\DotRecast.Core.csproj"/>
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<ProjectReference Include="..\DotRecast.Core\DotRecast.Core.csproj" />
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</ItemGroup>
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</Project>
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@ -0,0 +1,129 @@
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/*
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Copyright (c) 2009-2010 Mikko Mononen memon@inside.org
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recast4j copyright (c) 2021 Piotr Piastucki piotr@jtilia.org
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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using System;
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using DotRecast.Core;
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namespace DotRecast.Recast
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{
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public static class PolyUtils
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{
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public static bool pointInPoly(float[] verts, Vector3f p)
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{
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int i, j;
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bool c = false;
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for (i = 0, j = verts.Length / 3 - 1; i < verts.Length / 3; j = i++)
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{
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Vector3f vi = Vector3f.Of(verts[i * 3], verts[i * 3 + 1], verts[i * 3 + 2]);
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Vector3f vj = Vector3f.Of(verts[j * 3], verts[j * 3 + 1], verts[j * 3 + 2]);
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if (((vi[2] > p[2]) != (vj[2] > p[2]))
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&& (p[0] < (vj[0] - vi[0]) * (p[2] - vi[2]) / (vj[2] - vi[2]) + vi[0]))
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{
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c = !c;
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}
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}
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return c;
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}
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public static int offsetPoly(float[] verts, int nverts, float offset, float[] outVerts, int maxOutVerts)
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{
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float MITER_LIMIT = 1.20f;
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int n = 0;
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for (int i = 0; i < nverts; i++)
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{
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int a = (i + nverts - 1) % nverts;
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int b = i;
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int c = (i + 1) % nverts;
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int va = a * 3;
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int vb = b * 3;
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int vc = c * 3;
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float dx0 = verts[vb] - verts[va];
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float dy0 = verts[vb + 2] - verts[va + 2];
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float d0 = dx0 * dx0 + dy0 * dy0;
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if (d0 > 1e-6f)
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{
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d0 = (float)(1.0f / Math.Sqrt(d0));
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dx0 *= d0;
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dy0 *= d0;
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}
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float dx1 = verts[vc] - verts[vb];
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float dy1 = verts[vc + 2] - verts[vb + 2];
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float d1 = dx1 * dx1 + dy1 * dy1;
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if (d1 > 1e-6f)
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{
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d1 = (float)(1.0f / Math.Sqrt(d1));
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dx1 *= d1;
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dy1 *= d1;
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}
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float dlx0 = -dy0;
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float dly0 = dx0;
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float dlx1 = -dy1;
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float dly1 = dx1;
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float cross = dx1 * dy0 - dx0 * dy1;
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float dmx = (dlx0 + dlx1) * 0.5f;
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float dmy = (dly0 + dly1) * 0.5f;
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float dmr2 = dmx * dmx + dmy * dmy;
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bool bevel = dmr2 * MITER_LIMIT * MITER_LIMIT < 1.0f;
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if (dmr2 > 1e-6f)
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{
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float scale = 1.0f / dmr2;
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dmx *= scale;
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dmy *= scale;
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}
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if (bevel && cross < 0.0f)
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{
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if (n + 2 >= maxOutVerts)
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{
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return 0;
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}
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float d = (1.0f - (dx0 * dx1 + dy0 * dy1)) * 0.5f;
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outVerts[n * 3 + 0] = verts[vb] + (-dlx0 + dx0 * d) * offset;
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outVerts[n * 3 + 1] = verts[vb + 1];
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outVerts[n * 3 + 2] = verts[vb + 2] + (-dly0 + dy0 * d) * offset;
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n++;
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outVerts[n * 3 + 0] = verts[vb] + (-dlx1 - dx1 * d) * offset;
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outVerts[n * 3 + 1] = verts[vb + 1];
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outVerts[n * 3 + 2] = verts[vb + 2] + (-dly1 - dy1 * d) * offset;
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n++;
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}
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else
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{
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if (n + 1 >= maxOutVerts)
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{
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return 0;
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}
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outVerts[n * 3 + 0] = verts[vb] - dmx * offset;
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outVerts[n * 3 + 1] = verts[vb + 1];
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outVerts[n * 3 + 2] = verts[vb + 2] - dmy * offset;
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n++;
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}
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}
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return n;
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}
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}
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}
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