Re: [tuxor-devel] 2D vs. 3D marbles (was: Re. blueballs)

[R. R. <ren...@ba...>]

On Fri August 15 2008 09:10, R. Reucher wrote:
> I vote for 2D sprites! It should be fine to have "snow ball" like marble
> sprites for ~180 degrees (assuming that the marbles/textures/bump-maps use
> rotational symmetry, which would even avoid the problem with the rotation
> angle!). A "frame skip" of 5  should be sufficient, meaning to require at
> least 36 sprite images per marble. If we do all textures / bump-maps the
> same and just use different colors, it would be sufficient to have those 36
> images in white; I could create the rest on-the-fly in a precalculation
> step -- colorization, plus pseudo dynamic lightning / reflections / other
> effects. It should be possible to run smoothly this way, even on systems
> with a slower graphics subsystem.
Thinking about it again, it should even be sufficient to render less than 
that... because if we use a rotational symmetric texture / bump map, a set of 
images for 90 degrees / a quarter of a full rotation should be enough, too.

But we should perhaps narrow the angle skip to 2 degrees, which means that we 
would need 45 images of the marble sprite to animate the rotation.

And... depending on the kind of texture / bump map, this could also be 
narrowed down to 45 degrees with a 1 degree "angle skip" (also 45 images). 
This should really be enough for a smooth animation of rotating "snow 
marbles" :)...

Have fun, René
-- 
René Reucher
Tel: +49 160 7115802
FAX: +49 6359 205423
ren...@ba...
http://www.batcom-it.net/

A truly wise man never plays leapfrog with a unicorn.