View Full Version : Modeling Sky and Sun

08-19-2002, 09:29 PM
Hi all,
I develope an Simple Flight Simulator with OpenGL. But it doesnt have sky and sun. I want your advise and seggestion to make a sun and sky (Objects in infinite distance).
Is there any good source to do this feature?

Thanks a lot.

08-21-2002, 06:28 PM
i use a sky texture and mapped it in a skybox or skydome...

08-21-2002, 07:07 PM
You could use a sky dome together with a skybox and billboard you sun...

[This message has been edited by mancha (edited 08-21-2002).]

08-21-2002, 10:08 PM
I use a Sky Dome in my app and it looks realy
nice. Map a cloud texture onto a sphere and
draw it without depth testing (glDepthMask), so your terrain is not cutted by the sphere. I use 2 blended (gl_src_alpha,gl_one_minus_src_alpha) spheres which rotate counterwise around the Y axis, so it looks like real cloud motions.

But i think you would like to fly through the clouds, draw the sphere without cloud textures, just with gradients of the sky and then draw cloud layers with transparency.

--------- skydome
/ \
/...........\ cloudlayer
/ \
---------------\ terrain

Check out vterrain.org, they have good tips for modelling sky & clouds.

omega arts
08-25-2002, 06:27 PM
How good of a sky are you looking for. You can set up clouds using noise. And animat them. Look in the book gama programming gems or go to www.gamedev.net (http://www.gamedev.net) and search in the forums for sky box there is one artical i have seen and it show how one person made a realtime skymap that looks as good as the skys in a full feature film http://www.opengl.org/discussion_boards/ubb/smile.gif hope that helps

08-28-2002, 03:39 PM
Yes thats all good but what you what is a skydome with a good texture that is seamless and then offset the texture(animate) looks real cool.