/// <summary>
/// SV_HullPointContents
/// </summary>
static int HullPointContents(hull_t hull, int num, ref Vector3 p)
{
while (num >= 0)
{
if (num < hull.firstclipnode || num > hull.lastclipnode)
{
Sys.Error("SV_HullPointContents: bad node number");
}
short[] node_children = hull.clipnodes[num].children;
mplane_t plane = hull.planes[hull.clipnodes[num].planenum];
float d;
if (plane.type < 3)
{
d = Mathlib.Comp(ref p, plane.type) - plane.dist;
}
else
{
d = Vector3.Dot(plane.normal, p) - plane.dist;
}
if (d < 0)
{
num = node_children[1];
}
else
{
num = node_children[0];
}
}
return(num);
}
/// <summary>
/// SV_ClipMoveToEntity
/// Handles selection or creation of a clipping hull, and offseting (and
/// eventually rotation) of the end points
/// </summary>
static trace_t ClipMoveToEntity(edict_t ent, ref Vector3 start, ref Vector3 mins, ref Vector3 maxs, ref Vector3 end)
{
trace_t trace = new trace_t();
// fill in a default trace
trace.fraction = 1;
trace.allsolid = true;
trace.endpos = end;
// get the clipping hull
Vector3 offset;
hull_t hull = HullForEntity(ent, ref mins, ref maxs, out offset);
Vector3 start_l = start - offset;
Vector3 end_l = end - offset;
// trace a line through the apropriate clipping hull
RecursiveHullCheck(hull, hull.firstclipnode, 0, 1, ref start_l, ref end_l, trace);
// fix trace up by the offset
if (trace.fraction != 1)
{
trace.endpos += offset;
}
// did we clip the move?
if (trace.fraction < 1 || trace.startsolid)
{
trace.ent = ent;
}
return(trace);
}
public void CopyFrom(hull_t src)
{
this.clipnodes = src.clipnodes;
this.planes = src.planes;
this.firstclipnode = src.firstclipnode;
this.lastclipnode = src.lastclipnode;
this.clip_mins = src.clip_mins;
this.clip_maxs = src.clip_maxs;
}
/// <summary>
/// SV_HullForEntity
/// Returns a hull that can be used for testing or clipping an object of mins/maxs size.
/// Offset is filled in to contain the adjustment that must be added to the
/// testing object's origin to get a point to use with the returned hull.
/// </summary>
static hull_t HullForEntity(edict_t ent, ref Vector3 mins, ref Vector3 maxs, out Vector3 offset)
{
hull_t hull = null;
// decide which clipping hull to use, based on the size
if (ent.v.solid == Solids.SOLID_BSP)
{ // explicit hulls in the BSP model
if (ent.v.movetype != Movetypes.MOVETYPE_PUSH)
{
Sys.Error("SOLID_BSP without MOVETYPE_PUSH");
}
model_t model = sv.models[(int)ent.v.modelindex];
if (model == null || model.type != modtype_t.mod_brush)
{
Sys.Error("MOVETYPE_PUSH with a non bsp model");
}
Vector3 size = maxs - mins;
if (size.X < 3)
{
hull = model.hulls[0];
}
else if (size.X <= 32)
{
hull = model.hulls[1];
}
else
{
hull = model.hulls[2];
}
// calculate an offset value to center the origin
offset = hull.clip_mins - mins;
offset += Common.ToVector(ref ent.v.origin);
}
else
{
// create a temp hull from bounding box sizes
Vector3 hullmins = Common.ToVector(ref ent.v.mins) - maxs;
Vector3 hullmaxs = Common.ToVector(ref ent.v.maxs) - mins;
hull = HullForBox(ref hullmins, ref hullmaxs);
offset = Common.ToVector(ref ent.v.origin);
}
return(hull);
}
/// <summary>
/// SV_RecursiveHullCheck
/// </summary>
public static bool RecursiveHullCheck(hull_t hull, int num, float p1f, float p2f, ref Vector3 p1, ref Vector3 p2, trace_t trace)
{
// check for empty
if (num < 0)
{
if (num != Contents.CONTENTS_SOLID)
{
trace.allsolid = false;
if (num == Contents.CONTENTS_EMPTY)
{
trace.inopen = true;
}
else
{
trace.inwater = true;
}
}
else
{
trace.startsolid = true;
}
return(true); // empty
}
if (num < hull.firstclipnode || num > hull.lastclipnode)
{
Sys.Error("SV_RecursiveHullCheck: bad node number");
}
//
// find the point distances
//
short[] node_children = hull.clipnodes[num].children;
mplane_t plane = hull.planes[hull.clipnodes[num].planenum];
float t1, t2;
if (plane.type < 3)
{
t1 = Mathlib.Comp(ref p1, plane.type) - plane.dist;
t2 = Mathlib.Comp(ref p2, plane.type) - plane.dist;
}
else
{
t1 = Vector3.Dot(plane.normal, p1) - plane.dist;
t2 = Vector3.Dot(plane.normal, p2) - plane.dist;
}
if (t1 >= 0 && t2 >= 0)
{
return(RecursiveHullCheck(hull, node_children[0], p1f, p2f, ref p1, ref p2, trace));
}
if (t1 < 0 && t2 < 0)
{
return(RecursiveHullCheck(hull, node_children[1], p1f, p2f, ref p1, ref p2, trace));
}
// put the crosspoint DIST_EPSILON pixels on the near side
float frac;
if (t1 < 0)
{
frac = (t1 + DIST_EPSILON) / (t1 - t2);
}
else
{
frac = (t1 - DIST_EPSILON) / (t1 - t2);
}
if (frac < 0)
{
frac = 0;
}
if (frac > 1)
{
frac = 1;
}
float midf = p1f + (p2f - p1f) * frac;
Vector3 mid = p1 + (p2 - p1) * frac;
int side = (t1 < 0) ? 1 : 0;
// move up to the node
if (!RecursiveHullCheck(hull, node_children[side], p1f, midf, ref p1, ref mid, trace))
{
return(false);
}
if (HullPointContents(hull, node_children[side ^ 1], ref mid) != Contents.CONTENTS_SOLID)
{
// go past the node
return(RecursiveHullCheck(hull, node_children[side ^ 1], midf, p2f, ref mid, ref p2, trace));
}
if (trace.allsolid)
{
return(false); // never got out of the solid area
}
//==================
// the other side of the node is solid, this is the impact point
//==================
if (side == 0)
{
trace.plane.normal = plane.normal;
trace.plane.dist = plane.dist;
}
else
{
trace.plane.normal = -plane.normal;
trace.plane.dist = -plane.dist;
}
while (HullPointContents(hull, hull.firstclipnode, ref mid) == Contents.CONTENTS_SOLID)
{
// shouldn't really happen, but does occasionally
frac -= 0.1f;
if (frac < 0)
{
trace.fraction = midf;
trace.endpos = mid;
Con.DPrint("backup past 0\n");
return(false);
}
midf = p1f + (p2f - p1f) * frac;
mid = p1 + (p2 - p1) * frac;
}
trace.fraction = midf;
trace.endpos = mid;
return(false);
}
