I'm not a huge expert, but: 1. the slave should be post, because you want to render the cross/axes on top of the rest. 2. you can just use a perspective projection if you want a 3d looking axis or a orthogonal view if you want a 'less' 3d look to it. Be sure to set the near and far correct, I think a orthogonal might standard be limited to rendering z=0 only? 3. I think this is because you use a clear color on the slave cam. That means that each frame it will first clear the viewport (therefor your main model doesn't show it that area). For the axis: don't use a clear color, but instead use setClearMask to clear the zbuffer (or else it might use the zvalues from your main scene in the viewport and that doesn't make sense). Then it just should draw the axis on whatever you rendered in your main scene.
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