Some changes:

1) To the rain macro: replacing the *rand() of the rain angle by 
+RRand() with a total variation of 2 degrees max.

2) To the rain macro: adding a file-saving utility for rain drop 
parameters. The reading of such a file is much faster than complete 
processing each time.

3) To the rain macro: replaced the csg raindrop cylinder by a mesh2 
tapering cylinder.

4) 800k raindrops and slight down-scaling. The problem with down-scaling 
is that the drops become invisible, so increasing the number of drops 
does not change the final view much. A possible solution could be to 
slightly increase the size of the drops with distance from the camera 
but that might become weird. I shall investigate.

5) To the (ground) mist faking visibility loss has been added turbulence.

6) Specular and reflection added to the rock surfaces and road. /Not/ to 
the grass btw.

Thomas

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