数学知识---平面

luyuncsd123

于 2013-08-22 22:59:54 发布

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  bool Plane::isIntersect(const Line & line, Vector3 * cross) const
    {
        float distS = distToPoint(line.start);
        float distE = distToPoint(line.end);
        if(distS * distE > 0)
        {
            return false;
        }

        if(cross)
        {
            *cross = line.interpolation(fabs(distS), fabs(distE));
        }
        return true;
    }

    bool Plane::isIntersect(const Vector3 & start, const Vector3 & end, float * pPos) const
    {
        float distS = distToPoint(start);
        float distE = distToPoint(end);
        if(distS * distE > 0)
        {
            return false;
        }

        if(pPos)
        {
            *pPos = fabs(distS)/(fabs(distS) + fabs(distE));
        }
        return true;
    }

    bool Plane::isSphereIntersect(const Vector3 & center, float radius, Vector3 * cross/*=NULL*/)
    {
        float ds = distToPoint(center);
        if (fabs(ds) > radius)
        {
            return false;
        }
        if (cross)
        {
            *cross = center + normal * ds;
        }
        return true;
    }