People say spheres sould be textured with cube maps, and not Mercator streched textures. (like ones NASA gives)
I found this blog post https://mycodingwrongs.wordpress.com/2010/07/24/reprojecting-blue-marble/
The guy reprojected Mercator texture onto Gnomonic cube map.
I was able to texture a sphere with that cube map he gave. I'm not sure if I created that mesh correctly, but it looks quite good.
example: http://dev.keraj.net/sphere/ (press
- on numpad to add more vertices, press V to see wireframe)
1. But I don't know how he did that. How did he reproject from Mercator to Gnomonic. He gave a link to wolfram page on Gnomonic projection, but I am not sure how use that.
2. What if I want to create my own cube map? (ie. procedurally, out of perlin noise, or even manually)
I hope some of you guys been through this and can give me some advices, maybe even some code.
I would really like to know what are good ways to mesh a sphere and texture it procedurally correctly.