bool TriSpansPlane(RoadTriangle tri, Plane pl)
{
float[] dist = new float[3];
dist[0] = BMathLib.pointPlaneDistance(tri.mVerts[0].mPos, pl);
dist[1] = BMathLib.pointPlaneDistance(tri.mVerts[1].mPos, pl);
dist[2] = BMathLib.pointPlaneDistance(tri.mVerts[2].mPos, pl);
if (
(dist[0] == 0 && dist[1] == 0) || //2 pts coplanar
(dist[0] == 0 && dist[2] == 0) || //2 pts coplanar
(dist[2] == 0 && dist[1] == 0) || //2 pts coplanar
(dist[0] == 0 && dist[1] < 0 && dist[2] < 0) || //1 point coplanar,
(dist[0] == 0 && dist[1] > 0 && dist[2] > 0) || //1 point coplanar,
(dist[1] == 0 && dist[2] < 0 && dist[0] < 0) || //1 point coplanar,
(dist[1] == 0 && dist[2] > 0 && dist[0] > 0) || //1 point coplanar,
(dist[2] == 0 && dist[0] < 0 && dist[1] < 0) || //1 point coplanar,
(dist[2] == 0 && dist[0] > 0 && dist[1] > 0) || //1 point coplanar,
(dist[0] <= 0 && dist[1] <= 0 && dist[2] <= 0) || //3 points on one side
(dist[0] >= 0 && dist[1] >= 0 && dist[2] >= 0) //3 points on one side
)
{
return(false);
}
return(true);
}
bool triContainedInBox(RoadTriangle tri, float minx, float minz, float maxx, float maxz)
{
if (tri.mVerts[0].mPos.X >= minx && tri.mVerts[0].mPos.X <= maxx && tri.mVerts[0].mPos.Z >= minz && tri.mVerts[0].mPos.Z <= maxz &&
tri.mVerts[1].mPos.X >= minx && tri.mVerts[1].mPos.X <= maxx && tri.mVerts[1].mPos.Z >= minz && tri.mVerts[1].mPos.Z <= maxz &&
tri.mVerts[2].mPos.X >= minx && tri.mVerts[2].mPos.X <= maxx && tri.mVerts[2].mPos.Z >= minz && tri.mVerts[2].mPos.Z <= maxz)
{
return(true);
}
return(false);
}
void clipPolygon(RoadTriangle roadTri, Plane plane, List <RoadVert> posResults, List <RoadVert> negResults)
{
float[] dist = new float[3];
dist[0] = BMathLib.pointPlaneDistance(roadTri.mVerts[0].mPos, plane);
dist[1] = BMathLib.pointPlaneDistance(roadTri.mVerts[1].mPos, plane);
dist[2] = BMathLib.pointPlaneDistance(roadTri.mVerts[2].mPos, plane);
List <RoadVert> results = new List <RoadVert>();
results.Add(roadTri.mVerts[0]);
results.Add(roadTri.mVerts[1]);
results.Add(roadTri.mVerts[2]);
//CLM This function ASSUMES that the poly is SPANNING the plane (prior tests determine this!)
Vector3 ray = Vector3.Empty;
Vector3 orig = Vector3.Empty;
float tVal = 0;
orig = roadTri.mVerts[0].mPos;
ray = BMathLib.Normalize(roadTri.mVerts[1].mPos - roadTri.mVerts[0].mPos);
if (BMathLib.rayPlaneIntersect(plane, orig, ray, false, ref tVal))
{
float tdist = (float)(tVal / Vector3.Length(roadTri.mVerts[1].mPos - roadTri.mVerts[0].mPos));
if (tdist <= 1)
{
results.Add(lerpVerts(roadTri.mVerts[0], roadTri.mVerts[1], tdist));
}
}
ray = BMathLib.Normalize(roadTri.mVerts[2].mPos - roadTri.mVerts[0].mPos);
if (BMathLib.rayPlaneIntersect(plane, orig, ray, false, ref tVal))
{
float tdist = (float)(tVal / Vector3.Length(roadTri.mVerts[2].mPos - roadTri.mVerts[0].mPos));
if (tdist <= 1)
{
results.Add(lerpVerts(roadTri.mVerts[0], roadTri.mVerts[2], tdist));
}
}
orig = roadTri.mVerts[1].mPos;
ray = BMathLib.Normalize(roadTri.mVerts[2].mPos - roadTri.mVerts[1].mPos);
if (BMathLib.rayPlaneIntersect(plane, orig, ray, false, ref tVal))
{
float tdist = (float)(tVal / Vector3.Length(roadTri.mVerts[2].mPos - roadTri.mVerts[1].mPos));
if (tdist <= 1)
{
results.Add(lerpVerts(roadTri.mVerts[1], roadTri.mVerts[2], tdist));
}
}
for (int i = 0; i < results.Count; i++)
{
for (int c = i + 1; c < results.Count; c++)
{
if (results[i] == results[c])
{
results.RemoveAt(c);
}
}
float tdist = BMathLib.pointPlaneDistance(results[i].mPos, plane);
if (tdist > 0)
{
posResults.Add(results[i]);
}
else if (tdist < 0)
{
negResults.Add(results[i]);
}
else //tdist==0 (spanning vert)
{
posResults.Add(results[i]);
negResults.Add(results[i]);
}
}
results.Clear();
}
public void exportRoads(ref ExportResults results)
{
DateTime n = DateTime.Now;
//for each road,
for (int roadIndex = 0; roadIndex < RoadManager.giveNumRoads(); roadIndex++)
{
List <RoadTriangle> triList = new List <RoadTriangle>();
Road rd = RoadManager.giveRoad(roadIndex);
if (rd.getNumControlPoints() == 0) //don't export roads w/o points on the map
{
continue;
}
//Step 1, generate polygon lists////////////////////////////////////////////////////
for (int rcpIndex = 0; rcpIndex < rd.getNumControlPoints(); rcpIndex++)
{
roadControlPoint rcp = rd.getPoint(rcpIndex);
int numTris = (int)(rcp.mVerts.Count / 3);
for (int triIndex = 0; triIndex < numTris; triIndex++)
{
RoadTriangle rt = new RoadTriangle();
rt.mVerts[0] = new RoadVert();
rt.mVerts[0].mPos = new Vector3(rcp.mVerts[triIndex * 3 + 0].x, rcp.mVerts[triIndex * 3 + 0].y, rcp.mVerts[triIndex * 3 + 0].z);
rt.mVerts[0].mUv0 = new Vector2(rcp.mVerts[triIndex * 3 + 0].u0, rcp.mVerts[triIndex * 3 + 0].v0);
rt.mVerts[1] = new RoadVert();
rt.mVerts[1].mPos = new Vector3(rcp.mVerts[triIndex * 3 + 1].x, rcp.mVerts[triIndex * 3 + 1].y, rcp.mVerts[triIndex * 3 + 1].z);
rt.mVerts[1].mUv0 = new Vector2(rcp.mVerts[triIndex * 3 + 1].u0, rcp.mVerts[triIndex * 3 + 1].v0);
rt.mVerts[2] = new RoadVert();
rt.mVerts[2].mPos = new Vector3(rcp.mVerts[triIndex * 3 + 2].x, rcp.mVerts[triIndex * 3 + 2].y, rcp.mVerts[triIndex * 3 + 2].z);
rt.mVerts[2].mUv0 = new Vector2(rcp.mVerts[triIndex * 3 + 2].u0, rcp.mVerts[triIndex * 3 + 2].v0);
triList.Add(rt);
}
}
//now add our triStrip segments (into triLists)
for (int segIndex = 0; segIndex < rd.getNumRoadSegments(); segIndex++)
{
roadSegment rs = rd.getRoadSegment(segIndex);
int numTris = rs.mNumVerts - 2;
int vertIndex = rs.mStartVertInParentSegment + 2;
for (int i = 0; i < numTris; i++)
{
RoadTriangle rt = new RoadTriangle();
rt.mVerts[0] = new RoadVert();
rt.mVerts[0].mPos = new Vector3(rd.mVerts[vertIndex - 2].x, rd.mVerts[vertIndex - 2].y, rd.mVerts[vertIndex - 2].z);
rt.mVerts[0].mUv0 = new Vector2(rd.mVerts[vertIndex - 2].u0, rd.mVerts[vertIndex - 2].v0);
rt.mVerts[1] = new RoadVert();
rt.mVerts[1].mPos = new Vector3(rd.mVerts[vertIndex - 1].x, rd.mVerts[vertIndex - 1].y, rd.mVerts[vertIndex - 1].z);
rt.mVerts[1].mUv0 = new Vector2(rd.mVerts[vertIndex - 1].u0, rd.mVerts[vertIndex - 1].v0);
rt.mVerts[2] = new RoadVert();
rt.mVerts[2].mPos = new Vector3(rd.mVerts[vertIndex].x, rd.mVerts[vertIndex].y, rd.mVerts[vertIndex].z);
rt.mVerts[2].mUv0 = new Vector2(rd.mVerts[vertIndex].u0, rd.mVerts[vertIndex].v0);
triList.Add(rt);
vertIndex++;
}
}
//Step 2, split Polygons////////////////////////////////////////////////////
int width = (int)(BTerrainQuadNode.cMaxWidth);
int numPlanes = (int)(TerrainGlobals.getTerrain().getNumXVerts() / width);
//Split along XPlane
for (int planeIndex = 0; planeIndex < numPlanes; planeIndex++)
{
Plane pl = Plane.FromPointNormal(new Vector3(planeIndex * width * TerrainGlobals.getTerrain().getTileScale(), 0, 0), BMathLib.unitX);
splitPolyListAgainstPlane(pl, triList);
}
//split along ZPlane
for (int planeIndex = 0; planeIndex < numPlanes; planeIndex++)
{
Plane pl = Plane.FromPointNormal(new Vector3(0, 0, planeIndex * width * TerrainGlobals.getTerrain().getTileScale()), BMathLib.unitZ);
splitPolyListAgainstPlane(pl, triList);
}
//Step 3, add polies to qn./////////////////////////////////////////////////
List <RoadQN> roadQNs = new List <RoadQN>();
int numQNs = (int)(TerrainGlobals.getTerrain().getNumXVerts() / width);
int qnWidth = (int)(width * TerrainGlobals.getTerrain().getTileScale());
for (int qnX = 0; qnX < numQNs; qnX++)
{
for (int qnZ = 0; qnZ < numQNs; qnZ++)
{
float x = qnX * qnWidth;
float z = qnZ * qnWidth;
RoadQN rqn = new RoadQN();
for (int triIndex = 0; triIndex < triList.Count; triIndex++)
{
if (triContainedInBox(triList[triIndex], x, z, x + qnWidth, z + qnWidth))
{
triList[triIndex].ensureWinding();
rqn.mTris.Add(triList[triIndex]);
rqn.mOwnerQNIndex = qnX * numQNs + qnZ;
}
}
if (rqn.mTris.Count != 0)
{
roadQNs.Add(rqn);
}
}
}
//Step 4, write road chunk to disk./////////////////////////////////////////////
ECF.ECFChunkHolder chunkHolder = new ECF.ECFChunkHolder();
chunkHolder.mDataMemStream = new MemoryStream();
BinaryWriter binWriter = new BinaryWriter(chunkHolder.mDataMemStream);
//Filename
string fName = CoreGlobals.getWorkPaths().mRoadsPath + "\\" + rd.getRoadTextureName();
fName = fName.Remove(0, CoreGlobals.getWorkPaths().mGameArtDirectory.Length + 1);
char[] filename = new char[32];
fName.CopyTo(0, filename, 0, fName.Length);
binWriter.Write(filename);
ExportTo360.addTextureChannelDependencies(CoreGlobals.getWorkPaths().mRoadsPath + "\\" + rd.getRoadTextureName());
float zero = 0;
int totalMemory = 0;
//write our chunks
binWriter.Write(Xbox_EndianSwap.endSwapI32(roadQNs.Count));
for (int qnI = 0; qnI < roadQNs.Count; qnI++)
{
binWriter.Write(Xbox_EndianSwap.endSwapI32(roadQNs[qnI].mOwnerQNIndex));
binWriter.Write(Xbox_EndianSwap.endSwapI32(roadQNs[qnI].mTris.Count));
int memSize = roadQNs[qnI].mTris.Count * (3 * (sizeof(short) * 6));
binWriter.Write(Xbox_EndianSwap.endSwapI32(memSize));
List <float> vList = new List <float>();
for (int c = 0; c < roadQNs[qnI].mTris.Count; c++)
{
for (int i = 0; i < 3; i++)
{
vList.Add(roadQNs[qnI].mTris[c].mVerts[i].mPos.X);
vList.Add(roadQNs[qnI].mTris[c].mVerts[i].mPos.Y);
vList.Add(roadQNs[qnI].mTris[c].mVerts[i].mPos.Z);
vList.Add(zero); //padd;
vList.Add(roadQNs[qnI].mTris[c].mVerts[i].mUv0.X);
vList.Add(roadQNs[qnI].mTris[c].mVerts[i].mUv0.Y);
}
}
float16[] sList = BMathLib.Float32To16Array(vList.ToArray());
for (int c = 0; c < vList.Count; c++)
{
ushort s = ((ushort)sList[c].getInternalDat());
binWriter.Write(Xbox_EndianSwap.endSwapI16(s));
}
totalMemory += memSize;
}
ExportTo360.mECF.addChunk((int)eXTT_ChunkID.cXTT_RoadsChunk, chunkHolder, binWriter.BaseStream.Length);
binWriter.Close();
binWriter = null;
chunkHolder.Close();
chunkHolder = null;
roadQNs.Clear();
triList.Clear();
TimeSpan ts = DateTime.Now - n;
results.terrainRoadTime = ts.TotalMinutes;
results.terrainRoadMemory = totalMemory;
}
}
void splitPolyListAgainstPlane(Plane pl, List <RoadTriangle> triList)
{
for (int triIndex = 0; triIndex < triList.Count; triIndex++)
{
if (TriSpansPlane(triList[triIndex], pl))
{
List <RoadVert> posResults = new List <RoadVert>();
List <RoadVert> negResults = new List <RoadVert>();
//split the poly, add results from both sides to end of list
clipPolygon(triList[triIndex], pl, posResults, negResults);
if (posResults.Count == 3)
{
RoadTriangle rt = new RoadTriangle();
rt.mVerts[0] = posResults[0];
rt.mVerts[1] = posResults[1];
rt.mVerts[2] = posResults[2];
triList.Add(rt);
}
else if (posResults.Count == 4)
{
//CLM we assume that clipPolygon returns
//the origional tri points first in the list
RoadTriangle rt0 = new RoadTriangle();
rt0.mVerts[0] = posResults[0];
rt0.mVerts[1] = posResults[1];
rt0.mVerts[2] = posResults[2];
triList.Add(rt0);
RoadTriangle rt1 = new RoadTriangle();
rt1.mVerts[0] = posResults[1];
rt1.mVerts[1] = posResults[2];
rt1.mVerts[2] = posResults[3];
triList.Add(rt1);
}
if (negResults.Count == 3)
{
RoadTriangle rt = new RoadTriangle();
rt.mVerts[0] = negResults[0];
rt.mVerts[1] = negResults[1];
rt.mVerts[2] = negResults[2];
triList.Add(rt);
}
else if (negResults.Count == 4)
{
//CLM we assume that clipPolygon returns
//the origional tri points first in the list
RoadTriangle rt0 = new RoadTriangle();
rt0.mVerts[0] = negResults[0];
rt0.mVerts[1] = negResults[1];
rt0.mVerts[2] = negResults[2];
triList.Add(rt0);
RoadTriangle rt1 = new RoadTriangle();
rt1.mVerts[0] = negResults[1];
rt1.mVerts[1] = negResults[2];
rt1.mVerts[2] = negResults[3];
triList.Add(rt1);
}
triList.RemoveAt(triIndex);
triIndex--;
posResults.Clear();
negResults.Clear();
}
}
}
