I would expect that the terrain wouldn't not cast a shadow and that the light from the sun still should be visible. So what do I expect when the sun is behind terrain and the atmosphere is told to not calculate the shadows from surfaces? If I think about "receive shadow from surfaces" in the atmosphere node then I realize that it is not being calculated if it's disabled. That's all happening in the atmosphere and the sun has nothing to do with that other than emitting light. Shadows are cast into the atmosphere or in other words there's less light behind areas which obstruct direct light. The sun is a light source and the medium where the light propagates through is the atmosphere. Of course this might have not any meaning from the render engine side, i don't know! Wish there were two settings one for really only " receive shadow from surfaces" for the atmosphereĪnd one "Sun behind objects" kind of setting. I would look first at the Render node or the Sun node but atmosphere wouldn't my first bet about this. It is hard to think about the Sun shining through the ground! Yes you have a point too Martin, but if you think about the sentence " receive shadow from surfaces" I can see your point, a bit, since it's related to rendering, but so are many other settings in the atmosphere or cloud node related to rendering and thus it's in the right place in my opinion. Otherwise the render dialogue would need to get a dynamic update for the amount of atmosphere/cloud nodes in the network and it would also need to deal with the ones which are really active in the network node or just being passively disconnected by the user. If you would have this setting in the rendernode then it would apply to all atmosphere or cloud elements. You can specify the need for calculating shadows from surfaces *per* cloud layer.Ĭlouds lower than mountain tops (for instance) would require "recieve shadows from surfaces" but the cloud layer up above in the sky wouldn't. The option says "receive shadows from surfaces" which means that *this* atmosphere element will receive shadows from surfaces. Isn't it logical to have it either in the clouds or atmosphere?
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