bool Plane::Intersects(const Line &line, float *dist) const
{
float t;
bool intersects = IntersectLinePlane(normal, this->d, line.pos, line.dir, t);
if (dist)
*dist = t;
return intersects;
}
bool Plane::Intersects(const Ray &ray, float *d) const
{
float t;
bool success = IntersectLinePlane(PointOnPlane(), normal, ray.pos, ray.dir, &t);
if (d)
*d = t;
return success && t >= 0.f;
}
bool Plane::Intersects(const Ray &ray, float *dist) const
{
float t;
bool success = IntersectLinePlane(normal, this->d, ray.pos, ray.dir, t);
if (dist)
*dist = t;
return success && t >= 0.f;
}
bool Plane::Intersects(const LineSegment &lineSegment, float *d) const
{
float t;
bool success = IntersectLinePlane(PointOnPlane(), normal, lineSegment.a, lineSegment.Dir(), &t);
const float lineSegmentLength = lineSegment.Length();
if (d)
*d = t / lineSegmentLength;
return success && t >= 0.f && t <= lineSegmentLength;
}
bool Plane::Intersects(const LineSegment &lineSegment, float *dist) const
{
float t;
bool success = IntersectLinePlane(normal, this->d, lineSegment.a, lineSegment.Dir(), t);
const float lineSegmentLength = lineSegment.Length();
if (dist)
*dist = t / lineSegmentLength;
return success && t >= 0.f && t <= lineSegmentLength;
}
BOOL cCollision::IntersectAABBLine( cAABB& AABB,cLine& Line,D3DXVECTOR3* pPosCross/*=NULL*/,D3DXVECTOR3* pVecReflection/*=NULL*/ )
{
for (int iside=0;iside<6;iside++)
{
if (IntersectLinePlane(Line,AABB.GetPlane(iside),pPosCross,pVecReflection))
{
return TRUE;
}
}
return FALSE;
}
int Plane::Clip(const Line &line, Ray &outRay) const
{
float t;
bool intersects = IntersectLinePlane(normal, d, line.pos, line.dir, t);
if (!intersects)
{
if (SignedDistance(line.pos) <= 0.f)
return 0; // Discard the whole line, it's completely behind the plane.
else
return 2; // The whole line is in the positive halfspace. Keep all of it.
}
outRay.pos = line.pos + line.dir * t; // The intersection point
if (Dot(line.dir, normal) >= 0.f)
outRay.dir = line.dir;
else
outRay.dir = -line.dir;
return 1; // Clipping resulted in a ray being generated.
}
bool Plane::Clip(vec &a, vec &b) const
{
float t;
bool intersects = IntersectLinePlane(normal, d, a, b-a, t);
if (!intersects || t <= 0.f || t >= 1.f)
{
if (SignedDistance(a) <= 0.f)
return false; // Discard the whole line segment, it's completely behind the plane.
else
return true; // The whole line segment is in the positive halfspace. Keep all of it.
}
vec pt = a + (b-a) * t; // The intersection point.
// We are either interested in the line segment [a, pt] or the segment [pt, b]. Which one is in the positive side?
if (IsOnPositiveSide(a))
b = pt;
else
a = pt;
return true;
}
bool Plane::Intersects(const Line &line, float *d) const
{
return IntersectLinePlane(PointOnPlane(), normal, line.pos, line.dir, d);
}
extern bool CollisionUtils::IntersectLineAxisBox(Vector a_lineStart, Vector a_lineEnd, Vector a_boxPos, Vector a_boxDimensions, Vector & a_intersection_OUT)
{
// Check the dimensions of the line against the box
const Vector halfDim = a_boxDimensions * 0.5f;
// Check the front plane of the box first
Vector planeCentre = Vector(a_boxPos.GetX(), a_boxPos.GetY() - halfDim.GetY(), a_boxPos.GetZ());
if (IntersectLinePlane(a_lineStart, a_lineEnd, planeCentre, Vector(0.0f, -1.0f, 0.0f), a_intersection_OUT))
{
if (fabsf(a_intersection_OUT.GetX() - planeCentre.GetX()) <= halfDim.GetX() &&
fabsf(a_intersection_OUT.GetY() - planeCentre.GetY()) <= halfDim.GetY() &&
fabsf(a_intersection_OUT.GetZ() - planeCentre.GetZ()) <= halfDim.GetZ())
{
return true;
}
}
// Check back plane
planeCentre = Vector(a_boxPos.GetX(), a_boxPos.GetY() + halfDim.GetY(), a_boxPos.GetZ());
if (IntersectLinePlane(a_lineStart, a_lineEnd, planeCentre, Vector(0.0f, 1.0f, 0.0f), a_intersection_OUT))
{
if (fabsf(a_intersection_OUT.GetX() - planeCentre.GetX()) <= halfDim.GetX() &&
fabsf(a_intersection_OUT.GetY() - planeCentre.GetY()) <= halfDim.GetY() &&
fabsf(a_intersection_OUT.GetZ() - planeCentre.GetZ()) <= halfDim.GetZ())
{
return true;
}
}
// Check left plane
planeCentre = Vector(a_boxPos.GetX() - halfDim.GetX(), a_boxPos.GetY(), a_boxPos.GetZ());
if (IntersectLinePlane(a_lineStart, a_lineEnd, planeCentre, Vector(-1.0f, 0.0f, 0.0f), a_intersection_OUT))
{
if (fabsf(a_intersection_OUT.GetX() - planeCentre.GetX()) <= halfDim.GetX() &&
fabsf(a_intersection_OUT.GetY() - planeCentre.GetY()) <= halfDim.GetY() &&
fabsf(a_intersection_OUT.GetZ() - planeCentre.GetZ()) <= halfDim.GetZ())
{
return true;
}
}
// Check right plane
planeCentre = Vector(a_boxPos.GetX() + halfDim.GetX(), a_boxPos.GetY(), a_boxPos.GetZ());
if (IntersectLinePlane(a_lineStart, a_lineEnd, planeCentre, Vector(1.0f, 0.0f, 0.0f), a_intersection_OUT))
{
if (fabsf(a_intersection_OUT.GetX() - planeCentre.GetX()) <= halfDim.GetX() &&
fabsf(a_intersection_OUT.GetY() - planeCentre.GetY()) <= halfDim.GetY() &&
fabsf(a_intersection_OUT.GetZ() - planeCentre.GetZ()) <= halfDim.GetZ())
{
return true;
}
}
// Check top plane
planeCentre = Vector(a_boxPos.GetX(), a_boxPos.GetY(), a_boxPos.GetZ() + halfDim.GetZ());
if (IntersectLinePlane(a_lineStart, a_lineEnd, planeCentre, Vector(0.0f, 0.0f, 1.0f), a_intersection_OUT))
{
if (fabsf(a_intersection_OUT.GetX() - planeCentre.GetX()) <= halfDim.GetX() &&
fabsf(a_intersection_OUT.GetY() - planeCentre.GetY()) <= halfDim.GetY() &&
fabsf(a_intersection_OUT.GetZ() - planeCentre.GetZ()) <= halfDim.GetZ())
{
return true;
}
}
// Check bottom plane
planeCentre = Vector(a_boxPos.GetX(), a_boxPos.GetY(), a_boxPos.GetZ() - halfDim.GetZ());
if (IntersectLinePlane(a_lineStart, a_lineEnd, planeCentre, Vector(0.0f, 0.0f, -1.0f), a_intersection_OUT))
{
if (fabsf(a_intersection_OUT.GetX() - planeCentre.GetX()) <= halfDim.GetX() &&
fabsf(a_intersection_OUT.GetY() - planeCentre.GetY()) <= halfDim.GetY() &&
fabsf(a_intersection_OUT.GetZ() - planeCentre.GetZ()) <= halfDim.GetZ())
{
return true;
}
}
return false;
}
