TG2 beginner question about cameras for a skybox

[hipshot]

Hi!

I've created a fairly basic cloudscape in TG2. However when I start to render it out as a cube, I get small variations of shade and light on the different angles and HUGE differences in the down angle. The only setting that I change between renders are the camera angle, but it seems almost like there's some kinda of dynamic light adaption or such here.

I use a horizontal fov of 90 on all angles and they do line up, it's just the colors I think, strange!

Look: http://i.imgur.com/cafK5vM.png

These are a few of the site sources I've looked at.
https://www.youtube.com/watch?v=DH1j4vwPqvo
https://developer.valvesoftware.com/wiki/Skyboxes_with_Terragen_2

[hipshot]

I found that it was the Global Illumination, I found it cause it was written in the bottom of this tutorial.

http://en.wikibooks.org/wiki/Game_Creation_with_XNA/3D_Development/Skybox

[Oshyan]

Yes, you are correct. Terragen 3 has a GI Cache function which fixes this very effectively, but it's only available in licensed versions (see feature comparison here: http://planetside.co.uk/products/tg3-product-comparison ). In TG2 you have to just avoid using GI (use Fill Lights instead, for example), or you can try using lots of overlap and taking care of blending in a stitching app like PTGUI (PanoTools). TG3 also has a Spherical Camera and Fisheye Lens, both of which can help for these kinds of projects.

- Oshyan