CGTalk - Earth atmosphere

machichi

10-28-2006, 05:13 PM

I have a little porblem with my earth here. How I get rid of the stars near the atmosphere that are shining through. The atmosphere is a light-source with visible light the stars are a sky object with stars in the luminance channel. please help^

Robert Glotzbach

10-28-2006, 05:47 PM

If you have After effects or PS, you could render out a mask, expand it in AE and use that to mask your stars, probably blur your mask to create a smooth transition.
For this type of work I would definitely render as multipass.

Kind regards, Robert

tcastudios

10-28-2006, 06:22 PM

Due to how volumetrics and such are (not) blended I can suggest using a masking disc object behind the planet instead.
Put a Null under the Planet and then a SpotLight (for the atmos) and a Disc with a gradient alpha in that Null. Have a Target Tag on the Null pointing at the Camera, check "Camera Dependant" in the Target Tag.
Add a CompTag on the MaskDisc turning of shadows etc.
See picts and attached scenefile. The MaskDisc is Reddish just to be visible here, it should be Black when render.

Cheers
Lennart
SceneFile (http://homepage.mac.com/tcastudios/tempfiles/AtmosLight.c4d.zip)
http://homepage.mac.com/tcastudios/tempfiles/atmoside.jpg

tcastudios

10-28-2006, 06:22 PM

SceneFile moved to previous post.

Cheers
Lennart

machichi

10-28-2006, 10:48 PM

thnx a lot u help me out^

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