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cBoundingBox: Only forward collisions are calculated.

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This commit is contained in:
madmaxoft 2013-09-02 19:51:13 +02:00
parent a884fbb919
commit f5e0c8c77e
2 changed files with 16 additions and 6 deletions
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20
source/BoundingBox.cpp
View File

@ -239,42 +239,50 @@ bool cBoundingBox::CalcLineIntersection(const Vector3d & a_Line1, const Vector3d
bool cBoundingBox::CalcLineIntersection(const Vector3d & a_Min, const Vector3d & a_Max, const Vector3d & a_Line1, const Vector3d & a_Line2, double & a_LineCoeff, char & a_Face)
{
if (IsInside(a_Min, a_Max, a_Line1))
{
// The starting point is inside the bounding box.
a_LineCoeff = 0;
a_Face = BLOCK_FACE_YM; // Make it look as the top face was hit, although none really are.
return true;
}
char Face = 0;
double Coeff = Vector3d::NO_INTERSECTION;
// Check each individual bbox face for intersection with the line, remember the one with the lowest coeff
double c = a_Line1.LineCoeffToXYPlane(a_Line2, a_Min.z);
if ((c < Coeff) && IsInside(a_Min, a_Max, a_Line1 + (a_Line2 - a_Line1) * c))
if ((c >= 0) && (c < Coeff) && IsInside(a_Min, a_Max, a_Line1 + (a_Line2 - a_Line1) * c))
{
Face = (a_Line1.z > a_Line2.z) ? BLOCK_FACE_ZP : BLOCK_FACE_ZM;
Coeff = c;
}
c = a_Line1.LineCoeffToXYPlane(a_Line2, a_Max.z);
if ((c < Coeff) && IsInside(a_Min, a_Max, a_Line1 + (a_Line2 - a_Line1) * c))
if ((c >= 0) && (c < Coeff) && IsInside(a_Min, a_Max, a_Line1 + (a_Line2 - a_Line1) * c))
{
Face = (a_Line1.z > a_Line2.z) ? BLOCK_FACE_ZP : BLOCK_FACE_ZM;
Coeff = c;
}
c = a_Line1.LineCoeffToXZPlane(a_Line2, a_Min.y);
if ((c < Coeff) && IsInside(a_Min, a_Max, a_Line1 + (a_Line2 - a_Line1) * c))
if ((c >= 0) && (c < Coeff) && IsInside(a_Min, a_Max, a_Line1 + (a_Line2 - a_Line1) * c))
{
Face = (a_Line1.y > a_Line2.y) ? BLOCK_FACE_YP : BLOCK_FACE_YM;
Coeff = c;
}
c = a_Line1.LineCoeffToXZPlane(a_Line2, a_Max.y);
if ((c < Coeff) && IsInside(a_Min, a_Max, a_Line1 + (a_Line2 - a_Line1) * c))
if ((c >= 0) && (c >= 0) && (c < Coeff) && IsInside(a_Min, a_Max, a_Line1 + (a_Line2 - a_Line1) * c))
{
Face = (a_Line1.y > a_Line2.y) ? BLOCK_FACE_YP : BLOCK_FACE_YM;
Coeff = c;
}
c = a_Line1.LineCoeffToYZPlane(a_Line2, a_Min.x);
if ((c < Coeff) && IsInside(a_Min, a_Max, a_Line1 + (a_Line2 - a_Line1) * c))
if ((c >= 0) && (c < Coeff) && IsInside(a_Min, a_Max, a_Line1 + (a_Line2 - a_Line1) * c))
{
Face = (a_Line1.x > a_Line2.x) ? BLOCK_FACE_XP : BLOCK_FACE_XM;
Coeff = c;
}
c = a_Line1.LineCoeffToYZPlane(a_Line2, a_Max.x);
if ((c < Coeff) && IsInside(a_Min, a_Max, a_Line1 + (a_Line2 - a_Line1) * c))
if ((c >= 0) && (c < Coeff) && IsInside(a_Min, a_Max, a_Line1 + (a_Line2 - a_Line1) * c))
{
Face = (a_Line1.x > a_Line2.x) ? BLOCK_FACE_XP : BLOCK_FACE_XM;
Coeff = c;

2
source/BoundingBox.h
View File

@ -64,11 +64,13 @@ public:
/** Returns true if this bounding box is intersected by the line specified by its two points
Also calculates the distance along the line in which the intersection occurs (0 .. 1)
Only forward collisions (a_LineCoeff >= 0) are returned.
*/
bool CalcLineIntersection(const Vector3d & a_Line1, const Vector3d & a_Line2, double & a_LineCoeff, char & a_Face);
/** Returns true if the specified bounding box is intersected by the line specified by its two points
Also calculates the distance along the line in which the intersection occurs (0 .. 1) and the face hit (BLOCK_FACE_ constants)
Only forward collisions (a_LineCoeff >= 0) are returned.
*/
static bool CalcLineIntersection(const Vector3d & a_Min, const Vector3d & a_Max, const Vector3d & a_Line1, const Vector3d & a_Line2, double & a_LineCoeff, char & a_Face);