radiosity without radiosity

[robcat2075]

I'm reading Jeremy Birn's book "Digital Lighting and Rendering" and trying some of the stuff he talks about.

 

This is a room lit with just simple z-buffered kleig lights. This renders in 75 seconds.

 

 

 

The one in the book is much better but I'll get there.

[Eric2575]

Please share the lighting details and maybe a screencap of the chor setup.

 

Notice I did not ask for a video tutorial

[ludo_si]

Please share the lighting details and maybe a screencap of the chor setup.

 

Notice I did not ask for a video tutorial

it is an essential book;)

[agep]

Interesting Robert. You definitely got my attention. Please tell how to

[robcat2075]

Here's the book. It's the world's foremost guide to CG lighting. He says so in the introduction.

 

It's not a set of step-by-step tutorials but more of a discussion of concepts and how basic techniques are used for different purposes. It's mostly application non-specific, but after I finish it I may write a set of annotations to translate the few things that are different in A:M. For example, what he calls a "point light" is a "bulb light" in A:M. The good news is that A:M seems not to be lacking in CG lighting tools.

 

I'm only on the second chapter but I'd recommend it to someone who is wondering about lighting. Make sure you get the second edition.

 

 

Here are the lights in my shot

 

[robcat2075]

Here's another tactic. This uses a light on a spline in the shape of the spot of sun on the ground for the bounce off the floor and another traversing a hemisphere spline outside the window for the sky light. Fewer lights but they are jittered over more angles. Still just Z-buffered Kleig Lights

 

 

 

more passes gets smoother results

 

16 passes 1:27

 

 

49 passes 3:44

 

 

100 passes 7:25

 

 

256 passes 19:14

 

 

Those are not bad times for nuanced lighting effects. It's entirely possible that with more lighting skill those times could be cut down.

[ludo_si]

very good rendering, i like the ambiance

 

Gratien

[jimd]

ditto nice renders thanks

[ludo_si]

is there possible to get the file?

[robcat2075]

is there possible to get the file?

 

It's very basic. I'm sure you'd enjoy making you're own.

 

but here you go:

 

Room09c_AllEmbedded.prj

 

 

 

 

 

 

Here's an actual radiosity render of the scene, lit by just the light hitting the floor. This takes 1 hour 27 minutes.

 

 

I'm sure this could be improved if I added the light of the sky coming thru the window. I suppose I'd have to do a skydome for that. But I can look at this and see how close I came with my artificial lighting to what the simulation did and adjust my lighting to mimic it more closely if I like the simulation.

 

But even the 256 pass render is quite a bit faster than the radiosity render for a similar effect. That's very interesting to me.

[Eric2575]

Thank you for sharing the project file Rob.

[stefff285]

excellent ! i did just bought AM and was looking for quality render. so then first learn the software and after give a BIG try to your radiosity

 

thanx a lot