bool QTPFS::PathCache::MarkDeadPaths(const SRectangle& r) {
#ifdef QTPFS_IGNORE_DEAD_PATHS
return false;
#endif
if (livePaths.empty())
return false;
// NOTE: not static, we run in multiple threads
CollisionVolume rv;
float3 rm;
GetRectangleCollisionVolume(r, rv, rm);
// "mark" any live path crossing the area of a terrain
// deformation, for which some or all of its waypoints
// might now be invalid and need to be recomputed
//
std::list<PathMapIt> livePathIts;
for (PathMapIt it = livePaths.begin(); it != livePaths.end(); ++it) {
IPath* path = it->second;
const float3& pathMins = path->GetBoundingBoxMins();
const float3& pathMaxs = path->GetBoundingBoxMaxs();
// if rectangle does not overlap bounding-box, skip this path
if (WS(r.x2) < pathMins.x) { continue; }
if (WS(r.z2) < pathMins.z) { continue; }
if (WS(r.x1) > pathMaxs.x) { continue; }
if (WS(r.z1) > pathMaxs.z) { continue; }
// figure out if <path> has at least one edge crossing <r>
// we only care about the segments we have not yet visited
for (unsigned int i = path->GetPointID(); i < (path->NumPoints() - 1); i++) {
const float3& p0 = path->GetPoint(i );
const float3& p1 = path->GetPoint(i + 1);
const bool pointInRect0 =
((p0.x >= WS(r.x1) && p0.x < WS(r.x2)) &&
(p0.z >= WS(r.z1) && p0.z < WS(r.z2)));
const bool pointInRect1 =
((p1.x >= WS(r.x1) && p1.x < WS(r.x2)) &&
(p1.z >= WS(r.z1) && p1.z < WS(r.z2)));
const bool havePointInRect = (pointInRect0 || pointInRect1);
// NOTE:
// box-volume tests in its own space, but points are
// in world-space so we must inv-transform them first
// (p0 --> p0 - rm, p1 --> p1 - rm)
const bool edgeCrossesRect =
((p0.x < WS(r.x1) && p1.x >= WS(r.x2)) && (p0.z >= WS(r.z1) && p1.z < WS(r.z2))) || // H
((p0.z < WS(r.z1) && p1.z >= WS(r.z2)) && (p0.x >= WS(r.x1) && p1.x < WS(r.x2))) || // V
CCollisionHandler::IntersectBox(&rv, p0 - rm, p1 - rm, NULL);
// remember the ID of each path affected by the deformation
if (havePointInRect || edgeCrossesRect) {
assert(tempPaths.find(path->GetID()) == tempPaths.end());
deadPaths.insert(std::make_pair<unsigned int, IPath*>(path->GetID(), path));
livePathIts.push_back(it);
break;
}
}
}
for (std::list<PathMapIt>::const_iterator it = livePathIts.begin(); it != livePathIts.end(); ++it) {
livePaths.erase(*it);
}
return true;
}
