private XVector3 BisectionSearch(XVector3 origin, XVector3 end, float min, float max)
{
float mid = (min + max) / 2;
XVector3 newEnd = end + mid * XVector3.Normalize(end - origin);
float minDot = float.MaxValue;
for (int i = 0; i < _verts.Length; i++)
{
float dot = XVector3.Dot(XVector3.Normalize(origin - newEnd), XVector3.Normalize(_verts[i] - newEnd));
if (dot < -_Epsilon)
{
return(BisectionSearch(origin, end, mid, max));
}
if (minDot > dot)
{
minDot = dot;
}
}
if (minDot > _Epsilon)
{
return(BisectionSearch(origin, end, min, mid));
}
return(newEnd);
}
private void GetReferencePoint()
{
bool assigned = false;
float min = float.MaxValue;
var ji = XVector3.Normalize(_verts[0] - _verts[1]);
var jk = XVector3.Normalize(_verts[2] - _verts[1]);
var kl = XVector3.Normalize(_verts[3] - _verts[2]);
var il = XVector3.Normalize(_verts[3] - _verts[0]);
var ij = -ji;
var kj = -jk;
var lk = -kl;
var li = -il;
float[] dots = { XVector3.Dot(ij, il), XVector3.Dot(ji, jk),
XVector3.Dot(kj, kl), XVector3.Dot(lk, li) };
for (int n = 0; n < dots.Length; n++)
{
if (dots[n] > -_Epsilon && min > dots[n] && (dots[(n + 3) % dots.Length] > -_Epsilon ||
dots[(n + 1) % dots.Length] > -_Epsilon))
{
assigned = true;
Start = _verts[n];
Corner = _verts[(n + 1) % dots.Length];
min = dots[n];
}
}
if (!assigned)
{
Start = _verts[0];
Corner = _verts[1];
}
}
public static float Dot(XVector3 a, XVector3 b)
{
float dot = 0;
dot += a.x * b.x;
dot += a.y * b.y;
dot += a.z * b.z;
return(dot);
}
private bool CheckVolume()
{
float volume = XVector3.Distance(_verts[0], _verts[1]);
volume *= XVector3.Distance(_verts[1], _verts[2]);
XVector3 high = GetPoint(Directions.Up);
XVector3 low = GetPoint(Directions.Down);
volume *= high.y - low.y;
TooSmall = volume < 70;
return(TooSmall);
}
private int ExponentialSearch(XVector3 origin, XVector3 end, int step = -1)
{
var newEnd = end + Exp(step) * XVector3.Normalize(end - origin);
for (int i = 0; i < _verts.Length; i++)
{
float dot = XVector3.Dot(XVector3.Normalize(origin - newEnd), XVector3.Normalize(_verts[i] - newEnd));
if (dot < 0)
{
return(ExponentialSearch(origin, end, step + 1));
}
}
return(step);
}
private XVector3 GetFurthestVertFrom(XVector3 o)
{
MaxHeap <XVector3> sorter = new MaxHeap <XVector3>((XVector3 a, XVector3 b) =>
{
return((XVector3.Distance(o, a) <= XVector3.Distance(o, b)) ? -1 : 1);
});
foreach (XVector3 vert in _verts)
{
sorter.Add(vert);
}
return(sorter.Remove());
}
private float MinDistanceBetweenAdjacentVerts()
{
float min = float.MaxValue;
for (int i = 0; i < _verts.Length - 1; i++)
{
for (int j = i + 1; j < _verts.Length; j++)
{
float a = XVector3.Distance(_verts[i], _verts[j]);
if (min > a)
{
min = a;
}
}
}
return(min);
}
public BoxIdentifier(IClosestPoint point)
{
unity = point;
_Centre = new XVector3(point.GetCentre());
try
{
GetVertices();
if (!CheckVolume())
{
GetDimensions();
}
}
catch
{
GetAltVertices();
if (!CheckVolume())
{
GetDimensions();
}
}
}
private void GetDimensions()
{
int step = ExponentialSearch(Start, Corner);
if (step > 0)
{
Corner = BisectionSearch(Start, Corner, Exp(step - 1), Exp(step));
}
Length = XVector3.Distance(Start, Corner);
//unity.Message(Start +" " + Corner);
End = Start - Corner;
End = new XVector3(-End.z, End.y, End.x);
End = Corner + End.normalized;// * MinDistanceBetweenAdjacentVerts();
step = ExponentialSearch(Corner, End);
if (step > 0)
{
End = BisectionSearch(Corner, End, Exp(step - 1), Exp(step));
}
Width = XVector3.Distance(Corner, End);
/* refPoint -> lineEnd -> lineEnd2 ALWAYS clockwise; vertices[i++] ALWAYS clockwise */
}
public static XVector3 Normalize(XVector3 a)
{
var o = new XVector3();
return(a / Distance(o, a));
}
public static XVector3 operator -(XVector3 b)
{
XVector3 a = new XVector3(-b.x, -b.y, -b.z);
return(a);
}
public static XVector3 operator /(XVector3 b, float divisor)
{
XVector3 a = new XVector3(b.x / divisor, b.y / divisor, b.z / divisor);
return(a);
}
public static XVector3 operator *(float multiplier, XVector3 b)
{
XVector3 a = new XVector3(b.x * multiplier, b.y * multiplier, b.z * multiplier);
return(a);
}
public static XVector3 operator -(XVector3 b, XVector3 c)
{
XVector3 a = new XVector3(b.x - c.x, b.y - c.y, b.z - c.z);
return(a);
}
public static XVector3 operator +(XVector3 b, XVector3 c)
{
XVector3 a = new XVector3(b.x + c.x, b.y + c.y, b.z + c.z);
return(a);
}
public static float Distance(XVector3 o, XVector3 a)
{
XVector3 line = a - o;
return((float)Math.Sqrt(line.x * line.x + line.y * line.y + line.z * line.z));
}