Best way to create planet atmosphers?

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Very nice! How do you get the night texture only in the dark side? that should be needing per pixel shading. Or, you use a multipass render and blend the images in Blitz?

I wouldn't have thought complex image blending could be achieved without rudimentary pixel shaders which Blitz lacks. At least not at a realtime speed. Unless, looking more closely, you're just adding the night texture on top, which seems to be the case as I can see white dots on the day side pic.

It's surprising how much can be achieved with clever textures and use of blend modes. HDR-like overbright reflections is one, which I haven't seen done (outside of my own code!). Likewise non-repeating grass textures is another that can be attained with a couple of textures, but even top-end games are being released to this day with neat little carpet-tiles of grass!