C++ (Cpp) BoundingSphere::validの例

コード例 #1

ファイル: LineSegmentIntersector.cpp プロジェクト: BlitzMaxModules/osg.mod

bool LineSegmentIntersector::intersects(const osg::BoundingSphere& bs)
{
    // if bs not valid then return true based on the assumption that an invalid sphere is yet to be defined.
    if (!bs.valid()) return true; 

    osg::Vec3d sm = _start - bs._center;
    double c = sm.length2()-bs._radius*bs._radius;
    if (c<0.0) return true;

    osg::Vec3d se = _end-_start;
    double a = se.length2();
    double b = (sm*se)*2.0;
    double d = b*b-4.0*a*c;

    if (d<0.0) return false;

    d = sqrt(d);

    double div = 1.0/(2.0*a);

    double r1 = (-b-d)*div;
    double r2 = (-b+d)*div;

    if (r1<=0.0 && r2<=0.0) return false;

    if (r1>=1.0 && r2>=1.0) return false;

    // passed all the rejection tests so line must intersect bounding sphere, return true.
    return true;
}

コード例 #2

ファイル: PrimitiveIntersector.cpp プロジェクト: emminizer/osgearth

bool PrimitiveIntersector::intersects(const osg::BoundingSphere& bs)
{
    // if bs not valid then return true based on the assumption that an invalid sphere is yet to be defined.
    if (!bs.valid()) return true;

    osg::Vec3d sm = _start - bs._center;
    double c = sm.length2()-bs._radius*bs._radius;
    if (c<0.0) return true;

    osg::Vec3d se = _end-_start;
    double a = se.length2();
    double b = (sm*se)*2.0;
    double d = b*b-4.0*a*c;

    if (d<0.0) return false;

    d = sqrt(d);

    double div = 1.0/(2.0*a);

    double r1 = (-b-d)*div;
    double r2 = (-b+d)*div;

    if (r1<=0.0 && r2<=0.0) return false;

    if (r1>=1.0 && r2>=1.0) return false;

    if (_intersectionLimit == LIMIT_NEAREST && !getIntersections().empty())
    {
        double ratio = (sm.length() - bs._radius) / sqrt(a);
        if (ratio >= getIntersections().begin()->ratio) return false;
    }

    // passed all the rejection tests so line must intersect bounding sphere, return true.
    return true;
}