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Blending problem with spheres

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Started by Robbbert November 08, 2004 11:45 AM

6 comments, last by Robbbert 19 years, 5 months ago

Robbbert

122

Author

November 08, 2004 11:45 AM

I've got a problem with my first simple solar system program. I made an Earth using gluSphere(quadratic,0.2f,32,32); and an atmosphere using gluSphere(quadratic,0.22f,32,32); The atmosphere is blended with glBlendFunc(GL_SRC_ALPHA,GL_ONE); The Earth and atmosphere are at the same position. It looks like this:

The clouds are not blended correctly. Without the Earth you can see what I mean:

With glDisable(GL_DEPTH_TEST); I don't get the right effect:

And with glDepthMask(GL_FALSE); I get another strange effect:

Did I something wrong or used the wrong method? How can I make an Earth with atmosphere without strange black lines? Thanks for your help! (Sorry for my bad English) [Edited by - Robbbert on November 8, 2004 12:15:59 PM]

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_DarkWIng_

602

November 08, 2004 01:32 PM

- Enable front face culling
- Render atmosphere
- Enable back face culling
- Render planet
- Render atmosphere

You don't need to disable depth buffer or even depth writes.

You should never let your fears become the boundaries of your dreams.

Robbbert

122

Author

November 08, 2004 03:01 PM

Thank you for helping me
Now it works perfectly! [grin]

llvllatrix

340

November 08, 2004 03:24 PM

Where did you get the textures? They're amazing; nice job if you did 'em yourself!

firesoft

103

November 08, 2004 08:45 PM

I'd like to see what it looks like now that you have it working.

Could you do another post please Robbbert?

5,051

November 09, 2004 05:54 AM

Quote:Original post by llvllatrix
Where did you get the textures?

I also have a earth texture here. I think I got it from USGS (US Geological Survey) and it's 8k x 4k RGB888. Definetly an overkill.

Previously "Krohm"

Shanjaq

151

November 09, 2004 05:38 PM

nah, the more detail the better. I'm having lots of fun with the 64k Earth texture in Celestia ^_^

Robbbert

122

Author

November 10, 2004 08:06 AM

I used Earth and Mars textures from this site:
http://www.space-graphics.com/
And other planet textures from:
http://astronomy.swin.edu.au/~pbourke/texture/

This topic is closed to new replies.

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