RE: [Algorithms] Lightmap Terrain

[<sro...@te...>]

Sorry for the response delay. I sended a response but from a other mail
address so i think
I need to rewrite this mail anyway. I will response for all reply answered
about this thread.

Thanks Niki it's exaclty a sort a raytracing a was thinking. I will check
the doc carefully.

Basicly, i want pre-calculate the "radiance" just before the use of the
terrain. I know
my terrain will be sort of static but i want just some default shadow on the
terrain at the startup.

>Have a look at my article at http://www.tashco.com/terraintexturing.html
>Mark Allen

Well thanks but i dont have problem with texturing now :)


>Hi,
>http://www.dgp.toronto.edu/people/JamesStewart/papers/tvcg97.html

I already see that and contact the author, btw it's not that i want with
this technique
calculate a terrain of 1025x1025 take too much time and if you want be
faster you must
use a pre-calculed file(horizon file) to be fast but this file is more big
than the heightfield.
Finaly it's a very good solution for non-realtime application.

>The trouble with outdoor area's is the sky. If you have a clear day you
will
>get very hard edged shadows as the sun light comes down more or less
>parrallel. However if you have lots of cloud then the sunlight that is not
>reflected back into space by the cloud layer tends to get diffused alot on
>the ground. Thus there are no really hard shadows.

Well basicly my terrain if for a game, i dont want make a extreme realist
terrain now :)
just something very good for a game.

>Radiosity deals well with reflected light in shadowy areas it does not deal
>very well with direct light. The best renders I have seen yet in computer
>graphics are hybrid raytracing radiosity engines utilising raytracing only
>for the specular light component and radiosity for the diffuse. (I did see
a
>paper on view depedant radiosity once but that thread of though seems to
have died)

A simple raytracing can do the job for me now i think :).
For the hybrid raytracing i will take a look never heard this technique
thanks

Regards,
Corrosif