How to do a planet like in this photo

[jorari71]

Hello!.

I need to create a planet for a scene which I need for a client inside a series of a robot.

I would like to create this degradation between the planet and its atmoshpere, with this smoooth degradation (see "reference" image attached).

I have by now this image (test).

And the materials settings (materials).

I tried to add some kind of falloff property applied to the opacity and transparency setting of the planet material making it gradually more transparent near the exterior of the planet but I couldn't reach to any satisfactory result.

Any idea?.

I've attached the scene in order to see if it's easier and faster for you make some test.

Thank you very much in advance.

[romullus]

There was similar discussion recently, take a look at it and see if you can gather some usefull information there: https://forum.corona-renderer.com/index.php/topic,15080.0.html

[jorari71]

Well, there they talk about the falloff method in order to get the border smoothed but I've tried it and I haven't get any satisfactory result. And I've made a lot of "tries and error" tests.

Thank you.