private void ReadBrushes()
{
//Length of the Lump
int BrushesLength = Header.DirEntries[8].Length;
//Number of textures to load
int nbBrushes = BrushesLength / (sizeof(int) * 3);
Brushes = new brush[nbBrushes];
for (int i = 0; i < nbBrushes; i++)
{
//brushside
int brushside = ReadInt();
//n_brushside
int n_brushside = ReadInt();
//texture
int texture = ReadInt();
Brushes[i] = new brush(brushside, n_brushside, texture);
}
}
public void CheckNode(int nodeIndex, float startFraction, float endFraction, Vector3 start, Vector3 end)
{
if (nodeIndex < 0)
{
// this is a leaf
leaf leaf = file.Leaves[-(nodeIndex + 1)];
for (int i = 0; i < leaf.N_LeafBrushes; i++)
{
brush brush = file.Brushes[file.LeafBrushes[leaf.LeafBrush + i].Brush];
if (brush.N_BrushSides > 0 && (file.Textures[brush.Texture].Contents & 1) != 0)
{
CheckBrush(brush);
}
}
return;
}
node node = file.Nodes[nodeIndex];
plane plane = file.Planes[node.Plane];
Vector3 planeNormal = BspRenderer.V3FromFloatArray(plane.Normal);
float startDistance = Vector3.Dot(start, planeNormal) - plane.Dist;
float endDistance = Vector3.Dot(end, planeNormal) - plane.Dist;
float offset = 0;
if (traceType == TT_RAY)
{
offset = 0;
}
else if (traceType == TT_SPHERE)
{
offset = traceRadius;
}
else if (traceType == TT_BOX)
{
offset = (float)(Math.Abs(traceExtents.X * planeNormal.X) + Math.Abs(traceExtents.Y * planeNormal.Y) + Math.Abs(traceExtents.Z * planeNormal.Z));
}
// A
if (startDistance >= offset && endDistance >= offset)
{
// in front of the plane
// checking front child
CheckNode(node.Children[0], startFraction, endFraction, start, end);
}// B
else if (startDistance < -offset && endDistance < -offset)
{
// behind the plane
// checking back child
CheckNode(node.Children[1], startFraction, endFraction, start, end);
}// C
else
{
// splitting between planes
int side;
float fraction1, fraction2, middleFraction;
Vector3 middle;
// split the segment in 2
if (startDistance < endDistance)
{
side = 1; // back
float inverseDistance = 1.0f / (startDistance - endDistance);
fraction1 = (startDistance - offset + float.Epsilon) * inverseDistance;
fraction2 = (startDistance - offset + float.Epsilon) * inverseDistance;
}
else if (endDistance < startDistance)
{
side = 0; // front
float inverseDistance = 1.0f / (startDistance - endDistance);
fraction1 = (startDistance + offset + float.Epsilon) * inverseDistance;
fraction2 = (startDistance - offset - float.Epsilon) * inverseDistance;
}
else
{
side = 0; //front
fraction1 = 1.0f;
fraction2 = 0.0f;
}
// make sure numbers are valid
if (fraction1 < 0.0f)
{
fraction1 = 0.0f;
}
else if (fraction1 > 1.0f)
{
fraction1 = 1.0f;
}
if (fraction2 < 0.0f)
{
fraction2 = 0.0f;
}
else if (fraction2 > 1.0f)
{
fraction2 = 1.0f;
}
// calculate middle point for the first side
middleFraction = startFraction + (endFraction - startFraction) * fraction1;
middle = start + fraction1 * (end - start);
// check first side
CheckNode(node.Children[side], startFraction, middleFraction, start, middle);
// calculate middle point for the second side
middleFraction = startFraction + (endFraction - startFraction) * fraction2;
middle = start * fraction2 * (end - start);
// check second side
CheckNode(node.Children[inverseSide(side)], startFraction, middleFraction, start, middle);
}
}
private void CheckBrush(brush pBrush)
{
float startFraction = -1.0f;
float endFraction = 1.0f;
bool startsout = false;
bool endsout = false;
for (int i = 0; i < pBrush.N_BrushSides; i++)
{
brushside brushside = file.BrusheSides[pBrush.BrushSide + i];
plane plane = file.Planes[brushside.Plane];
Vector3 planeNormal = BspRenderer.V3FromFloatArray(plane.Normal);
float startDistance = 0;
float endDistance = 0;
if (traceType == TT_RAY)
{
startDistance = Vector3.Dot(_inputStart, planeNormal) - plane.Dist;
endDistance = Vector3.Dot(_inputEnd, planeNormal) - plane.Dist;
}
else if (traceType == TT_SPHERE)
{
startDistance = Vector3.Dot(_inputStart, planeNormal) - (plane.Dist + traceRadius);
endDistance = Vector3.Dot(_inputEnd, planeNormal) - (plane.Dist + traceRadius);
}
else if (traceType == TT_BOX)
{
Vector3 offset = Vector3.Zero;
if (planeNormal.X < 0)
{
offset.X = traceMaxs.X;
}
else
{
offset.X = traceMins.X;
}
if (planeNormal.Y < 0)
{
offset.Y = traceMaxs.Y;
}
else
{
offset.Y = traceMins.Y;
}
if (planeNormal.Z < 0)
{
offset.Z = traceMaxs.Z;
}
else
{
offset.Z = traceMins.Z;
}
startDistance = (_inputStart.X + offset.X) * planeNormal.X + (_inputStart.Y + offset.Y) * planeNormal.Y + (_inputStart.Z + offset.Z) * planeNormal.Z - plane.Dist;
endDistance = (_inputEnd.X + offset.X) * planeNormal.X + (_inputEnd.Y + offset.Y) * planeNormal.Y + (_inputEnd.Z + offset.Z) * planeNormal.Z - plane.Dist;
}
if (startDistance > 0)
{
startsout = true;
}
if (endDistance > 0)
{
endsout = true;
}
// make sure the trace isnt on one side of the brush only
if (startDistance > 0 && endDistance > 0)
{
// both in front of the plane
return;
}
if (startDistance <= 0 && endDistance <= 0)
{
// both are behind the plane, it will get clipped by an other one
continue;
}
if (startDistance > endDistance)
{
// line is in the brush
float fraction = (startDistance - float.Epsilon) / (startDistance - endDistance);
if (fraction > startFraction)
{
startFraction = fraction;
}
}
else
{
//line is leaving the brush
float fraction = (startDistance + float.Epsilon) / (startDistance - endDistance);
if (fraction < endFraction)
{
endFraction = fraction;
}
}
}
if (startsout == false)
{
outputStartsOut = false;
if (endsout)
{
outputAllSolid = true;
}
return;
}
if (startFraction < endFraction)
{
if (startFraction > -1 && startFraction < outputFraction)
{
if (startFraction < 0)
{
startFraction = 0;
}
outputFraction = startFraction;
}
}
}