Pixelmaps or billboard textures might be the OpenGL terminology. Animation
studios might use the term Particle Systems. 1980's game programmers would
probably use the term sprites, especially if their motion changed when you
moved. In this case blowing off as the vehicle moved.
For snow, they would be partially transparent at the edges (alpha -0 )
and darker in the middle, so that when they were pasted on top together,
they would make that area of the screen go dark.
Not sure about the description of rain accumulation - if it were the effect
of water trickling down the window,
Doing trickling raindrops would be tricky - you would definitely need a
particle system with a surface threshold algorithm (marching
cubes/triangles) and some surface tension physics to generate the geometry
to do refraction.
On the inside of the window, you'd want condensation effects - that would
just be partially transparent gray.
On Wed, Dec 1, 2010 at 3:17 PM, Andrew Lowe a...@wht.com.au wrote:
On 1/12/2010 6:15 PM, Trajce (Nick) Nikolov wrote:
Hi Community,
any ideas/hints how to implement rain/snow accumulation on the screen
(like
for a driving sim)?
-Nick
A company I used to work for which did driving sims, mining trucks
in fact, just used a series of bitmaps - I might be using totally the wrong
buzzwords here, I've had my after work beer and the correct terms escape me.
The bit maps were generated by the graphics people and we just loaded them
up and overlayed them as needed.
There was a series of overlays that corresponded to:
1) A few drops
2) More drops
3) Even more drops
4) quite a few drops
...
...
...
...
n) That many drop that in combination with a dusty windscreen, remember
this is of a mining truck in an iron ore mine in Australia, that the
windscreen has become mud. Then the user would turn on the wipers and a new
set of overlays would be used which corresponded to the windscreen wipers
going.
These overlays were created by our graphic artists and we just
dumped them into the scene at the speed we needed to simulate the rain. In
other words the screen/rain/mud was not done dynamically with a snazzy
algorithm, it was basically good old page flipping animation.
Nick, does this make sense? If not I'll revisit the topic in the
morning, it's currently 11.15pm, and try and make more sense.
Regards,
Andrew
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