void TraceToDispTree(DispCollTree dispTree, Vector3 start, Vector3 end, Vector3 mins, Vector3 maxs, float startf, float endf, trace_t trace, bool raycast)
{
if (raycast)
{
}
else
{
Vector3 boxExtends = ((mins + maxs) * 0.5f) - mins;
if(dispTree.AABBSweep(start, end, boxExtends, startf, endf, ref trace))
{
}
}
}
bool OnLadder(trace_t trace)
{
if ((trace.contents & (int)brushflags.CONTENTS_LADDER) > 0)
return true;
return false;
}
void IntersectAABoxSweptTriangle(Vector3 start, Vector3 end, Vector3 extends,
Vector3 v1, Vector3 v2, Vector3 v3, Vector3 triNormal,
float triDist, ushort triFlags, ushort triSurfProp, ref trace_t trace, bool startsOutside)
{
//
// make sure the box and triangle are not initially intersecting!!
// NOTE: if bStartOutside is set -- this is assumed
//
if( !startsOutside )
{
// check for interection -- if not intersecting continue, otherwise
// return and let the "in solid" functions handle it
}
//
// initialize the axial-aligned box sweep triangle test
//
bool bStartOutSolid = false;
bool bEndOutSolid = false;
float fracStart = NEVER_UPDATED;
float fracEnd = 1.0f;
// calculate the box direction - the sweep direction
Vector3 boxDir = end - start;
//
// OPTIMIZATION: make sure objects are traveling toward one another
//
float angle = Vector3.Dot(triNormal, boxDir);// triNormal.Dot(boxDir);
if( angle/*triNormal.Dot( boxDir )*/ > ClipMap.EPSILON )
{
return;
}
// test against the triangle face plane
if (!FacePlane(triNormal, triDist, start, end, extends, ref fracStart, ref fracEnd, v1, v2, v3,
bStartOutSolid, bEndOutSolid)) { return; }
// test against axial planes (of the aabb)
if (!AxialPlanesXYZ(v1, v2, v3, start, end, extends, boxDir, triNormal, ref fracStart, ref fracEnd,
bStartOutSolid, bEndOutSolid)) { return; }
//
// There are 9 edge tests - edges 1, 2, 3 cross with the box edges (symmetry) 1, 2, 3. However, the box
// is axial-aligned resulting in axially directional edges -- thus each test is edges 1, 2, and 3 vs.
// axial planes x, y, and z
//
// There are potentially 9 more tests with edges, the edge's edges and the direction of motion!
// NOTE: I don't think these tests are necessary for a manifold surface -- but they still remain if
// it ever becomes a problem in the future!
//
Vector3 edge;
// edge 1 - axial tests are 2d tests, swept direction is a 3d test
edge = v2 - v1;
if (!EdgeCrossAxialX(edge, v1, v3, extends, start, end, triNormal, triDist, ref fracStart, ref fracEnd, bStartOutSolid, bEndOutSolid, 4)) { return; }
if (!EdgeCrossAxialY(edge, v1, v3, extends, start, end, triNormal, triDist, ref fracStart, ref fracEnd, bStartOutSolid, bEndOutSolid, 5)) { return; }
if (!EdgeCrossAxialZ(edge, v1, v3, extends, start, end, triNormal, triDist, ref fracStart, ref fracEnd, bStartOutSolid, bEndOutSolid, 6)) { return; }
// if( !EdgeCrossSweptDir( edge, v1, v3, boxDir, boxExtents, boxStart, boxEnd, fracStart, fracEnd ) ) { fraction = fracStart; return; }
// edge 2 - axial tests are 2d tests, swept direction is a 3d test
edge = v3 - v2;
if (!EdgeCrossAxialX(edge, v2, v1, extends, start, end, triNormal, triDist, ref fracStart, ref fracEnd, bStartOutSolid, bEndOutSolid, 7)) { return; }
if (!EdgeCrossAxialY(edge, v2, v1, extends, start, end, triNormal, triDist, ref fracStart, ref fracEnd, bStartOutSolid, bEndOutSolid, 8)) { return; }
if (!EdgeCrossAxialZ(edge, v2, v1, extends, start, end, triNormal, triDist, ref fracStart, ref fracEnd, bStartOutSolid, bEndOutSolid, 9)) { return; }
// if( !EdgeCrossSweptDir( edge, v2, v1, boxDir, boxExtents, boxStart, boxEnd, fracStart, fracEnd ) ) { fraction = fracStart; return; }
// edge 3 - axial tests are 2d tests, swept direction is a 3d test
edge = v1 - v3;
if (!EdgeCrossAxialX(edge, v3, v2, extends, start, end, triNormal, triDist, ref fracStart, ref fracEnd, bStartOutSolid, bEndOutSolid, 10)) { return; }
if (!EdgeCrossAxialY(edge, v3, v2, extends, start, end, triNormal, triDist, ref fracStart, ref fracEnd, bStartOutSolid, bEndOutSolid, 11)) { return; }
if (!EdgeCrossAxialZ(edge, v3, v2, extends, start, end, triNormal, triDist, ref fracStart, ref fracEnd, bStartOutSolid, bEndOutSolid, 12)) { return; }
// if( !EdgeCrossSweptDir( edge, v2, v1, boxDir, boxExtents, boxStart, boxEnd, fracStart, fracEnd ) ) { fraction = fracStart; return; }
//
// the direction of motion crossed with the axial planes is equivolent
// to cross the box (axial planes) and the
//
// if( !DirectionOfMotionCrossAxialPlanes( boxStart, boxEnd, boxDir, boxExtents, fracStart, fracEnd, v1, v2, v3 ) ) { fraction = fracStart; return; }
//
// didn't have a separating axis -- update trace data -- should I handle a fraction left solid here!????
//
if (fracStart < fracEnd)
{
if ((fracStart > NEVER_UPDATED) && (fracStart < trace.fraction))
{
// clamp -- shouldn't really ever be here!???
if (fracStart < 0.0f)
{
fracStart = 0.0f;
}
trace.fraction = fracStart;
trace.plane.normal = triNormal;
trace.plane.dist = triDist;
//trace.dispFlags = triFlags;
m_iLatestSurfProp = triSurfProp;
}
}
}
void SweptAABB_IntersectTriList(Vector3 start, Vector3 end, Vector3 extends, float startf, float endf, ref trace_t trace, TriList_t trilist)
{
Vector3 impactNormal = new Vector3();
float impactDist = 0f;
Tri_t tri;
//
// intersect against all the flagged triangles in trilist
//
for (int iTri = 0; iTri < trilist.Count; iTri++)
{
// get the current displacement
tri = trilist.ppTriList[iTri];
// intersection test
IntersectAABoxSweptTriangle(start, end, extends,
m_pVerts[tri.m_uiVerts[0]],
m_pVerts[tri.m_uiVerts[2]],
m_pVerts[tri.m_uiVerts[1]],
tri.m_vecNormal, tri.m_flDist,
tri.m_nFlags, tri.m_iSurfProp,
/*fraction,*/ref trace, true);
}
}
public bool AABBSweep(Vector3 start, Vector3 end, Vector3 extends,
float startf, float endf, ref trace_t trace)
{
//
// create and initialize the triangle list
//
TriList_t trilist = new TriList_t();
//
// create and initialize the primary AABB
//
AABB_t AABBox = new AABB_t();
//
// sweep box against the axial-aligned bboxed quad-tree and generate an initial
// list of collision tris
//
SweptAABB_BuildTriList(start, end, extends, 0, AABBox, trilist);
// save the starting fraction
float preIntersectionFrac = trace.fraction;
//
// sweep axis-aligned bounding box against the triangles in the list
//
if (trilist.Count > 0)
{
SweptAABB_IntersectTriList(start, end, extends, startf, endf, ref trace, trilist);
}
// collision
if (preIntersectionFrac > trace.fraction)
return true;
// no collision
return false;
}
