when your project is not too big just upload it somewhere - I´m going to take a look at it if you want
send me a PM

well my project is huge.. lol

Wow I love it!

ahh, found it, some other shader was causing the problem, one of slins blooms shaders, it doesnt seem to work with shadeC's hdr also.. i did get it running however, like the speed of it

the rays in the demo don't show up for me. There is no error message, but I can't see the sun in the sky and it doesn't cast rays. I can move it using the cursur keys, but that only changes the lightning on the ground.

my ATI HD 3780 graphics card should be able to handle it. drivers are a bit older, I might try updating it later.

hehe, ATI always sucks

@darkinferno: I asked you whether you are using the PP_Helper.c from the demo or not because I modified the functions to support MRTs -> more parameters

EDIT:
I uploaded a small vid.

While making the vid I noticed that the calculated sunpos seems to be the one of the last frame but I was not able to correct that know...
You can see this when you use a small and/or fast moving sun

Fortunately, you're right!
BTW, the shader looks amazing

The sunrays look really good. congrats. *thumbup*
After looking a the code i may found the reason why it doesnt work on amd cards.
You cant mix shadermodel 3.0 and 2. (or less) in the same pass, pixelshader 3.0 are only specified to be run with vertexshader 3.0. Nvidia drivers don't complain about this but amds does.

ahhhh alright, didnt know that thx!
@Schokokeks: just change this line in skycube_FX.fx: VertexShader = compile vs_2_0 VS(); to this: VertexShader = compile vs_3_0 VS();

Thank you hummel, changing that line worked indeed.
Great effect! can it also be used for larger/more detailed levels or will it get too slow?