source: trunk/packages/vizservers/nanovis/vrmath/vrPlane2.cpp @ 2720

#include <vrmath/vrPlane2.h>

void vrPlane2::makePts(const vrVector3f& p1, const vrVector3f& p2, const vrVector3f& p3) {

        normal.cross(p2 - p1, p3 - p1);
        normal.normalize();

        point = p1;
        
}

void vrPlane2::makeNormalPt(const vrVector3f& norm, const vrVector3f& pos) {
        normal = norm;
        point = pos;
}

bool vrPlane2::intersect(const vrLineSegment &seg, float &d) const 
{
        // STEVE
        // 2005-09-07
        
        float tu, td;

        tu = normal.x * (point.x - seg.pos.x) + normal.y * (point.y - seg.pos.y) 
                        + normal.z * (point.z - seg.pos.z);

        td = normal.x * seg.dir.x + normal.y * seg.dir.y + normal.z * seg.dir.z;

        if ( td == 0.0f ) return false;

        d = tu / td;
        
        return true;
}

float vrPlane2::distance(const vrVector3f& pos) const 
{

        vrVector3f plane_point = crossPoint( pos );

        return pos.distance( plane_point );
}

vrVector3f vrPlane2::crossPoint(const vrVector3f& pos) const {

        vrLineSegment seg;

        seg.pos = pos;
        seg.dir = normal;

        float t = 0;
        intersect(seg, t);

        return seg.getPoint(t);
}