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- LinePlaneIntersect

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This is for calculating intersections with slope sprites later.
This commit is contained in:
Christoph Oelckers 2022-09-25 13:51:23 +02:00
parent ef03e64025
commit 09d66914f4
1 changed files with 15 additions and 0 deletions
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15
source/core/gamefuncs.h
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@ -583,6 +583,21 @@ inline double GetRayIntersect(const DVector3& start1, const DVector3& vect1, con
return factor2;
}
inline double LinePlaneIntersect(const DVector3& start, const DVector3& trace, const DVector3& ppoint, const DVector3& pvec1, const DVector3& pvec2)
{
auto normal = pvec1 ^ pvec2; // we do not need a unit vector here.
double dist = normal.dot(ppoint);
double dotStart = normal.dot(start);
double dotTrace = normal.dot(trace);
if (dotTrace == 0) return -FLT_MAX;
return (dist - dotStart) / dotTrace; // we are only interested in the factor
}
inline double LineHeightIntersect(double startz, double tracez, double dist)
{
return (dist - startz) / tracez; // we are only interested in the factor
}
inline void alignceilslope(sectortype* sect, const DVector3& pos)
{
sect->setceilingslope(getslopeval(sect, pos, sect->ceilingz));