bool CD3dcam::BoxInFrustum(BOUNDINGBOX *pBoundingBox)
{
	bool intersect = false;
	D3DXVECTOR3 _pvtx, _nvtx;
	bool x, y, z;

	float dist;

	for(int i=0;i<6;++i)
	{
		if(mFrustumPlane[i].a >= 0.0f) x = true;
			else x = false;
		if(mFrustumPlane[i].b >= 0.0f) y = true;
			else y = false;
		if(mFrustumPlane[i].c >= 0.0f) z = true;
			else z = false;
		
		if(x && y && z)
		{
			_pvtx = pBoundingBox->max;
			_nvtx = pBoundingBox->min;
		}
		if(x && y && !z)
		{
			_pvtx.x = pBoundingBox->max.x;
			_pvtx.y = pBoundingBox->max.y;
			_pvtx.z = pBoundingBox->min.z;

			_nvtx.x = pBoundingBox->min.x;
			_nvtx.y = pBoundingBox->min.y;
			_nvtx.z = pBoundingBox->max.z;
		}
		if(x && !y && z)
		{
			_pvtx.x = pBoundingBox->max.x;
			_pvtx.y = pBoundingBox->min.y;
			_pvtx.z = pBoundingBox->max.z;

			_nvtx.x = pBoundingBox->min.x;
			_nvtx.y = pBoundingBox->max.y;
			_nvtx.z = pBoundingBox->min.z;
		}
		if(x && !y && !z)
		{
			_pvtx.x = pBoundingBox->max.x;
			_pvtx.y = pBoundingBox->min.y;
			_pvtx.z = pBoundingBox->min.z;

			_nvtx.x = pBoundingBox->min.x;
			_nvtx.y = pBoundingBox->max.y;
			_nvtx.z = pBoundingBox->max.z;
		}
		if(!x && y && z)
		{
			_pvtx.x = pBoundingBox->min.x;
			_pvtx.y = pBoundingBox->max.y;
			_pvtx.z = pBoundingBox->max.z;

			_nvtx.x = pBoundingBox->max.x;
			_nvtx.y = pBoundingBox->min.y;
			_nvtx.z = pBoundingBox->min.z;
		}
		if(!x && y && !z)
		{
			_pvtx.x = pBoundingBox->min.x;
			_pvtx.y = pBoundingBox->max.y;
			_pvtx.z = pBoundingBox->min.z;

			_nvtx.x = pBoundingBox->max.x;
			_nvtx.y = pBoundingBox->min.y;
			_nvtx.z = pBoundingBox->max.z;
		}
		if(!x && !y && z)
		{
			_pvtx.x = pBoundingBox->min.x;
			_pvtx.y = pBoundingBox->min.y;
			_pvtx.z = pBoundingBox->max.z;

			_nvtx.x = pBoundingBox->max.x;
			_nvtx.y = pBoundingBox->max.y;
			_nvtx.z = pBoundingBox->min.z;
		}
		if(!x && !y && z)
		{
			_pvtx = pBoundingBox->min;
			_nvtx = pBoundingBox->max;
		}

		dist = D3DXPlaneDotCoord(&mFrustumPlane[i], &_nvtx);
		if(dist > 0) return false;		// completely outside

		dist = D3DXPlaneDotCoord(&mFrustumPlane[i], &_pvtx);
		if(dist > 0) intersect = true;	// intersecting
	}
	if(intersect) return true;
	return true; 
}