radiosity colour
 

hi. i've got an interior scene of a building to render with brightly coloured floors but white walls and a white ceiling. i'm lighting with a good hdri sky, radiosity@ 550% (monte carlo 4x12), ambient at 25% (255, 255, 255) and a few distant/area lights to pick out certain areas. the problem is that the radiosity is making the colours of the walls and ceilings pick up the colour of the floors IN A BIG WAY!!! i'm trying everything to correct it - but if anyone could help? ................

thanks. cheers.
mat

Turn it down 550% is a huge #. Turn Ambient down to 5% or even turn it off. Haveing Ambient at 25% and white is adding way to much light to Radiocity. You can also check your hdir map and turn that down also. Try lower values when rendering. Remember Radiocity calculates bounced light off of surfaces so light can stack off eachother (from bounces) and get all blown out white on surfaces. Check the diffusion on your surfaces and try to turn it down 20% or so this will absorb some of the light hitting it.

turn affect difuse from all your lights.
Then Put your image as an image world.
Render and set other values

thanks for your advice. had a pretty late night trying to get things worked out!

if i turn radoisity down and get ambient light down to around 0-5% the trouble is that the interior of the building gets really dark. i know these settings are good + this is how i've always rendered before but never with such a big building - the light just doesn't seem to get in there on those settings.

i've tried turning off affect difuse and it doest help reduce the colour bleeding quite a bit but doesn't quite elliminate it enough - maybe i should try tweaking diffuse values (floor is @ 35%, walls/ceilings are @75%)

in the end i've broken the model down into smaller .lwo objects (because originally from archicad) for the floors and walls and checked 'unseen by rays' for the coloured floors. this seems to elliminate the colour bleeding altogether but they are still lit up ok!

I've included 3 images showing what i mean - image_01 shows the problem that i described yesterday. image_02 is re-rendered with 'affect diffuse' turned off for all lights and image_03 uses the 'unseen by rays' solution. let me know what you think?

thanks again.
mat

(by the way image_03 rendered at 4x12 monte carlo, enhanced low AA, area light quality 1, 720x576 pixels. Took 5 hours. Is one frame of a 3500 frame animation. I REALLY need to reduce rendering time - thinking of baking radiosity - never done it before so if there is a better way i would love to hear it)

Hehe how about Fprime,,, worked wonders for me. But baking is also good.

cool. never used Fprime but I'll investigate it.
cheers.