OPC_SphereAABBOverlap.h

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inline_ BOOL SphereCollider::SphereAABBOverlap(const Point& center, const Point& extents)
{ 
        // Stats
        mNbVolumeBVTests++;

        float d = 0.0f;

        //find the square of the distance
        //from the sphere to the box
#ifdef OLDIES
        for(udword i=0;i<3;i++)
        {
                float tmp = mCenter[i] - center[i];
                float s = tmp + extents[i];

                if(s<0.0f)      d += s*s;
                else
                {
                        s = tmp - extents[i];
                        if(s>0.0f)      d += s*s;
                }
        }
#endif

//#ifdef NEW_TEST

//      float tmp = mCenter.x - center.x;
//      float s = tmp + extents.x;

        float tmp,s;

        tmp = mCenter.x - center.x;
        s = tmp + extents.x;

        if(s<0.0f)
        {
                d += s*s;
                if(d>mRadius2)  return FALSE;
        }
        else
        {
                s = tmp - extents.x;
                if(s>0.0f)
                {
                        d += s*s;
                        if(d>mRadius2)  return FALSE;
                }
        }

        tmp = mCenter.y - center.y;
        s = tmp + extents.y;

        if(s<0.0f)
        {
                d += s*s;
                if(d>mRadius2)  return FALSE;
        }
        else
        {
                s = tmp - extents.y;
                if(s>0.0f)
                {
                        d += s*s;
                        if(d>mRadius2)  return FALSE;
                }
        }

        tmp = mCenter.z - center.z;
        s = tmp + extents.z;

        if(s<0.0f)
        {
                d += s*s;
                if(d>mRadius2)  return FALSE;
        }
        else
        {
                s = tmp - extents.z;
                if(s>0.0f)
                {
                        d += s*s;
                        if(d>mRadius2)  return FALSE;
                }
        }
//#endif

#ifdef OLDIES
//      Point Min = center - extents;
//      Point Max = center + extents;

        float d = 0.0f;

        //find the square of the distance
        //from the sphere to the box
        for(udword i=0;i<3;i++)
        {
float Min = center[i] - extents[i];

//              if(mCenter[i]<Min[i])
                if(mCenter[i]<Min)
                {
//                      float s = mCenter[i] - Min[i];
                        float s = mCenter[i] - Min;
                        d += s*s;
                }
                else
                {
float Max = center[i] + extents[i];

//                      if(mCenter[i]>Max[i])
                        if(mCenter[i]>Max)
                        {
                                float s = mCenter[i] - Max;
                                d += s*s;
                        }
                }
        }
#endif
        return d <= mRadius2;
}