Okay, I've pushed an experimental version of a grain overlay texture for the
model ubershader to FGData. It affects Atmospheric Light Scattering only, i.e.
will be absent in the default rendering, which should make for easy comparison.
For lack of texture units, I had to take the rainbow coloring of reflections
out for the moment (again, only in the Atmosperic Light Scattering version). I
can't visually spot a difference, and in any case a 2d texture lookup call
seems an overkill for a simple 1d color table, so I plan to replace that by a
function eventually. As far as I can see and test, this shouldn't take any
framerate unless used.
The grain overlay is configured pretty much like any other model effect in the
ubershader - a model specific effect file needs to set the flags, which are
* grain-texture-enabled: does what you think it does, needs to be 1 to work
* grain-magnification : the texture magnification relative to the base texture
- I think values between 10 and 100 would work here
The grain texture itself needs to be declared as n=14. The grain texture should
be largely transparent and seamless - I think unlike for the terrain tiling
artefacts are not an issue for artificial patterns, they actually occur.
For a quick check, inserting the following xml code into
Aircraft/Citation-Bravo/Models/Effects/reflect.eff
<texture n="14">
<image>Textures.high/Terrain/grain_texture.png</image>
<filter>linear-mipmap-linear</filter>
<wrap-s>repeat</wrap-s>
<wrap-t>repeat</wrap-t>
<internal-format>normalized</internal-format>
</texture>
<grain-texture-enabled>1</grain-texture-enabled>
<grain-magnification>50</grain-magnification>
gives me this effect for the hull of the Bravo which is now re-painted using
the terrain grain texture at high resolution
http://users.jyu.fi/~trenk/pics/overlay.jpg
Looks a bit like a military version...
So, please play with it - it's basically down to how well the grain overlay can
be made.
* Thorsten
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