public static RayTraceResult rayTrace(Vector3 startPos, Vector3 dir, RayTraceChunkManager rtm, float length)
{
DirInfo dirInfo = new DirInfo(dir);
Vector3 startPosInner = startPos;
float hitTime = 0;
float startOffset = 0;
bool bHitBounds = true;//能击中总区域，或者在内部
if (startPos.x >= 0 && startPos.x < rtm.getSizeX() && startPos.y >= 0 && startPos.y < rtm.getSizeY() && startPos.z >= 0 && startPos.z < rtm.getSizeZ())
{
bHitBounds = true;
}
else
{
bHitBounds = Misc.rayHitAABB(startPos, dir, new Vector3(0, 0, 0), rtm.getSize(), ref hitTime);
if (hitTime > 0)
{
startOffset = hitTime;
}
startPosInner = startPos + dir * startOffset - dir * 0.01f;
}
if (bHitBounds)
{
RayTraceResult rlt = rayTraceSmall(startPosInner, dirInfo, rtm, Face.FNI_Unknown, length - startOffset);
rlt.hitLength += startOffset;
return(rlt);
}
else
{
return(new RayTraceResult(false, 0, 0, 0, Face.FNI_Unknown, 0));
}
}
public RayCastRestult rayCast(Vector3 startPos, Vector3 dir, float length)
{
RayCastRestult outResult;
//求局部坐标，左下角为(0,0,0),单位长度为chunkSize
Vector3 localStartPos = startPos - new Vector3(curStartChunkX, curStartChunkY, curStartChunkZ);
RayTraceResult rlt = RayTrace.rayTrace(localStartPos, dir, this, length);//进行粗糙范围射线追踪
outResult.bHit = rlt.bHit;
if (rlt.hitLength > length)
{
outResult.bHit = false;
}
outResult.hitFaceIndex = (int)rlt.faceIndex;
outResult.hitLength = rlt.hitLength;
return(outResult);
}
public static RayTraceResult rayTraceBig(Vector3 startPos, DirInfo dirInfo, RayTraceChunkManager rtm, Face faceIn, float maxLength)
{
int S = rtm.ChunkSize;
int CX = (int)(startPos.x + dirInfo.stepX * 0.0001f) / S;
int CY = (int)(startPos.y + dirInfo.stepY * 0.0001f) / S;
int CZ = (int)(startPos.z + dirInfo.stepZ * 0.0001f) / S;
int X = CX * S;
int Y = CY * S;
int Z = CZ * S;
float curDistance = 0;
float tMaxX = (dirInfo.stepX > 0 ? (S - (startPos.x - X)) : (startPos.x - X)) * dirInfo.tDeltaX;//沿射线走多远才能跳到下一个X格
float tMaxY = (dirInfo.stepY > 0 ? (S - (startPos.y - Y)) : (startPos.y - Y)) * dirInfo.tDeltaY;
float tMaxZ = (dirInfo.stepZ > 0 ? (S - (startPos.z - Z)) : (startPos.z - Z)) * dirInfo.tDeltaZ;
int outSizeCX = dirInfo.stepX > 0 ? rtm.getSizeX() / S : -1;
int outSizeCY = dirInfo.stepY > 0 ? rtm.getSizeY() / S : -1;
int outSizeCZ = dirInfo.stepZ > 0 ? rtm.getSizeZ() / S : -1;
while (true)
{
if (tMaxX < tMaxY)
{
if (tMaxX < tMaxZ)
{
if (!rtm.isChunkEmpty(CX, CY, CZ))
{
RayTraceResult smallRlt = rayTraceSmall(startPos + dirInfo.dir * curDistance, dirInfo, rtm, faceIn, Mathf.Max(tMaxX, maxLength) - curDistance);
if (smallRlt.bHit)
{
smallRlt.hitLength += curDistance;
return(smallRlt);
}
}
CX += dirInfo.stepX;
if (CX == outSizeCX)
{
return(new RayTraceResult(false, X, Y, Z, dirInfo.stepX > 0 ? Face.FNI_x0 : Face.FNI_x1, tMaxX));
}
else
{
if (tMaxX > maxLength)
{
return(new RayTraceResult(false, X, Y, Z, Face.FNI_OutOfLength, tMaxX));
}
}
curDistance = tMaxX;
tMaxX += dirInfo.tDeltaX * S;
}
else
{
if (!rtm.isChunkEmpty(CX, CY, CZ))
{
RayTraceResult smallRlt = rayTraceSmall(startPos + dirInfo.dir * curDistance, dirInfo, rtm, faceIn, Mathf.Max(tMaxZ, maxLength) - curDistance);
if (smallRlt.bHit)
{
smallRlt.hitLength += curDistance;
return(smallRlt);
}
}
CZ += dirInfo.stepZ;
if (CZ == outSizeCZ)
{
return(new RayTraceResult(false, X, Y, Z, dirInfo.stepZ > 0 ? Face.FNI_z0 : Face.FNI_z1, tMaxZ));
}
else
{
if (tMaxZ > maxLength)
{
return(new RayTraceResult(false, X, Y, Z, Face.FNI_OutOfLength, tMaxZ));
}
}
curDistance = tMaxZ;
tMaxZ += dirInfo.tDeltaZ * S;
}
}
else
{
if (tMaxY < tMaxZ)
{
if (!rtm.isChunkEmpty(CX, CY, CZ))
{
RayTraceResult smallRlt = rayTraceSmall(startPos + dirInfo.dir * curDistance, dirInfo, rtm, faceIn, Mathf.Max(tMaxY, maxLength) - curDistance);
if (smallRlt.bHit)
{
smallRlt.hitLength += curDistance;
return(smallRlt);
}
}
CY += dirInfo.stepY;
if (CY == outSizeCY)
{
return(new RayTraceResult(false, X, Y, Z, dirInfo.stepY > 0 ? Face.FNI_y0 : Face.FNI_y1, tMaxY));
}
else
{
if (tMaxY > maxLength)
{
return(new RayTraceResult(false, X, Y, Z, Face.FNI_OutOfLength, tMaxY));
}
}
curDistance = tMaxY;
tMaxY += dirInfo.tDeltaY * S;
}
else
{
if (!rtm.isChunkEmpty(CX, CY, CZ))
{
RayTraceResult smallRlt = rayTraceSmall(startPos + dirInfo.dir * curDistance, dirInfo, rtm, faceIn, Mathf.Max(tMaxZ, maxLength) - curDistance);
if (smallRlt.bHit)
{
smallRlt.hitLength += curDistance;
return(smallRlt);
}
}
CZ += dirInfo.stepZ;
if (CZ == outSizeCZ)
{
return(new RayTraceResult(false, X, Y, X, dirInfo.stepZ > 0 ? Face.FNI_z0 : Face.FNI_z1, tMaxZ));
}
else
{
if (tMaxZ > maxLength)
{
return(new RayTraceResult(false, X, Y, Z, Face.FNI_OutOfLength, tMaxZ));
}
}
curDistance = tMaxZ;
tMaxZ += dirInfo.tDeltaZ * S;
}
}
}
}
