3D Boxes

void CEngine::Draw3DBoundingBox( LTVector mins, LTVector maxs, D3DCOLOR color ) 
{ 
    if( !m_pDevice ) 
        return; 

    const unsigned short index[] = {0, 1, 1, 2, 2, 3, 3, 0, 4, 5, 5, 6, 6, 7, 7, 4, 3, 7, 2, 6, 0, 4, 1, 5}; 

    struct VertexData 
    { 
        float x, y, z; 
        D3DCOLOR color; 
        float tu, tv; 
    }; 

    VertexData ObjectBounds[8]; 

#define SET_OBJECT_BOUNDS_VEC_VALUE( i, o, t, w, c ) \ 
    ObjectBounds[i].x = o; ObjectBounds[i].y = t; ObjectBounds[i].z = w; \ 
    ObjectBounds[i].color = c; ObjectBounds[i].tu = 0.0f; ObjectBounds[i].tv = 0.0f; 

    SET_OBJECT_BOUNDS_VEC_VALUE( 0, mins.x, mins.y, mins.z, color ); 
    SET_OBJECT_BOUNDS_VEC_VALUE( 1, maxs.x, mins.y, mins.z, color ); 
    SET_OBJECT_BOUNDS_VEC_VALUE( 2, maxs.x, mins.y, maxs.z, color ); 
    SET_OBJECT_BOUNDS_VEC_VALUE( 3, mins.x, mins.y, maxs.z, color ); 
    SET_OBJECT_BOUNDS_VEC_VALUE( 4, mins.x, maxs.y, mins.z, color ); 
    SET_OBJECT_BOUNDS_VEC_VALUE( 5, maxs.x, maxs.y, mins.z, color ); 
    SET_OBJECT_BOUNDS_VEC_VALUE( 6, maxs.x, maxs.y, maxs.z, color ); 
    SET_OBJECT_BOUNDS_VEC_VALUE( 7, mins.x, maxs.y, maxs.z, color ); 

    m_pDevice->SetFVF( D3DFVF_XYZ|D3DFVF_DIFFUSE|D3DFVF_TEX1 ); 
    m_pDevice->DrawIndexedPrimitiveUP( D3DPT_LINELIST, 0, 24, 12, (void *)index, D3DFMT_INDEX16, ObjectBounds, sizeof( VertexData ) ); 
} 

void CEngine::Draw3DBoundingBoxChams( LTVector mins, LTVector maxs, D3DCOLOR color1, D3DCOLOR color2 ) 
{ 
    m_pDevice->SetRenderState( D3DRS_ZENABLE, FALSE ); 
    m_pDevice->SetRenderState( D3DRS_ZFUNC, D3DCMP_NEVER ); 

    Draw3DBoundingBox( mins, maxs, color1 ); 

    m_pDevice->SetRenderState( D3DRS_ZENABLE, TRUE ); 
    m_pDevice->SetRenderState( D3DRS_ZFUNC, D3DCMP_LESSEQUAL ); 

    Draw3DBoundingBox( mins, maxs, color2 ); 
}