moving textures for clouds question
Author
In order to generate moving clouds, I have a giant square and I texture map a bunch of clouds onto it. I then increment the texture coordinates at each rendering pass.
Is this a horribly wrong method of doing this ? It seems to be rather costly in terms of performance ? Any ways to make it better ? Should I use a different method like make small squares for each cloud and move them instead of the texture ?
Nitzan
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www.geocities.com/nitzanw
www.scorchedearth3d.net
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"In order to generate moving clouds, I have a giant square and I texture map a bunch of clouds onto it. I then increment the texture coordinates at each rendering pass."
Thats the way i do it. Either that or you could use the Texture matrix. The texture matrix might be easier if your using a vertex array for the clouds rendering primitive (be it dome/sphere/dodecahedron), but thats something i havent tried yet.
-=[ Megahertz ]=-
Thats the way i do it. Either that or you could use the Texture matrix. The texture matrix might be easier if your using a vertex array for the clouds rendering primitive (be it dome/sphere/dodecahedron), but thats something i havent tried yet.
-=[ Megahertz ]=-
The texture matrix is very easy to use. With it you don't have anymore to write things like glTexCoord2f(coord_s + offset_s, coord_t + offset_t).
Moving textures has been discussed recently at the glTexGen Question thread.
About the one big quad or little quads, I think that :
- if the sky is very clear (2 or 3 little clouds in the air) you should use different quads for each cloud.
- if the sky is very dark (clouds cover almost all the sky) you should use one big quad.
That's from a performance point of view, not from a realism point of view (even though both methods are "reallistically" very close).
[edited by - vincoof on March 20, 2002 2:28:09 AM]
Moving textures has been discussed recently at the glTexGen Question thread.
About the one big quad or little quads, I think that :
- if the sky is very clear (2 or 3 little clouds in the air) you should use different quads for each cloud.
- if the sky is very dark (clouds cover almost all the sky) you should use one big quad.
That's from a performance point of view, not from a realism point of view (even though both methods are "reallistically" very close).
[edited by - vincoof on March 20, 2002 2:28:09 AM]
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