Simul Weather Version 2: trueSKY

Simul Weather v2.0, available now for evaluation & licensing, offers the following new features:

* Sky Sequencer. A production-quality toolset for designing weather effects – keyframe control of clouds, time of day and atmospheric effects.
* High dynamic range – all outputs in 16 or 32-bit floating point HDR.

Simul Weather article on MODSIM.ORG

Top commercial simulation site, MODSIM.ORG has a review / product description up of Simul Weather (direct link). There’s some new video and screenshots, as well as some comparison shots of Simul’s time-of-day lighting with real photos.

Going from DX9 to DX10

Going from DirectX 9 to DirectX 10 in C++:
DX10 (at least the version of August 2007) seems to really dislike rendering to buffers that aren’t powers of two – e.g. rendering to a HDR buffer that’s 1280 by 720!

Here’s a table of roughly corresponding DX9 and DX10 expressions:

Notes on the sky

The best way to get a good-looking sky in your game or simulation is to use Simul Weather. But those who have an interest in such things, and time to spare might like to try writing their own sky scattering model. The first place to go in this case is usually to the 1999 paper on scattering by Preetham et …