Hi, I need to precompute lightmaps for my world (300K triangles) using radiosity. I can't found a tool able to do this (FSRad crash for world so large and is too slooooow). Can PRT engine of DirectX works for me? Can I use area lights with it? Thanks.

Hi,

I have tried Gile but it doesn't support radiosity and I don't like it. :)<br><br>Unfortunately, seems that DeleD doesn't support radiosity! :(

Quote: "That sounds odd. You not liking it is one thing, but not supporting radiosity? The "GI" in gile is "global illumination." Sure, their solution may not be radiosity per se, but results are results."<br><br>Well, I don't like the way Gile compute global illumination. I have posted my results &#111;n the forum, but I obtain no response:<br><br>http://www.frecle.net/forum/viewtopic.php?t=455<br><br>Anyway, I will try with 3ds max radiosity processor… although I'm afraid that it's quite slow.<br>Yes, I'm aware of Georgy Moshkin lightmap generator, but it's really not accurate.<br>Instead, I have found rtrad of Lionel Berenguier that looks great (http://berengui.club.fr/rtrad.html). I'm start to investigate &#111;n his method…<br><br>However, seems that the topic 'fast radiosity lightmaps generation for large world' is quite open. I wish also to investigate if the precomputed radiance transfer engine of DirectX could be used to accomplish this task.<br><br>

Quote:Original post by AGPX
However, seems that the topic 'fast radiosity lightmaps generation for large world' is quite open. I wish also to investigate if the precomputed radiance transfer engine of DirectX could be used to accomplish this task.

Don't quote me on this because I'm just trying to remember when I worked with it, but I'm pretty sure it won't solve your problem. The DX PRT engine will except if you run out of VRAM while processing, so I am guessing you would have problems with doing your large world all at once.

Hi Saruman,

you have perfectly right. I have tried DX PRT Engine but it crash miserably due to the memory requirements :(
So I have tried the texture baking feature of 3dsmax. It still crash when I use radiosity processor (my PC: Amd Athlon 64 3000+, 1 GB Ram, nVidia Geforce 6600 GT 128 Mb... yes, I know, my vram is a bit low...) :(
Next tentative: I have tried the MentalRay lightmapper instead of 3dsmax's radiosity processor (again called from 3dsmax). Well... successful! :)
Well, now I have a solution quality far better than radiosity (Full Global Illumination), but time requirements are a BIT longer... :I can build a faster preview using low resolution lightmaps...
Anyway, actually I can't see better (read: FASTER) way to do it...

Thanks...

...AGPX