Radiosity...best method?

[handige_harrie]

You are refering to a null room (all white background, just the model and soft radiosity shadows on the ground).

use a sky and floor object

sky material:
color = pure white 80%
luminance = pure white 25%

floor material:
color = pure white 100%

Radiosity on
Stochastic mode on
diffuse depth = 1
stochastic samples = as you like (i usually use around 30, but that pretty grainy)

Example pic coming up :)

[handige_harrie]

Settings as above, stochastic samples @ default (32)

Edit:Forget about this picture (I forgot to untick 'auto light' :shame:, check post below for good settings.

[AdamT]

I think you'd be better off using a plane instead of a floor object. It should lower render times a fair bit and allow for higher samples. Also, unless you like the grain or are animating, why use stochastic mode?

[flingster]

whats the point in stochastic mode? is it to create the dust look or is this just a result of a setting to high low?

(i know i should RTFM the advanced render book...but goddamn it when you do help >cinema>search in pdf it only searches the main cinema manual...that sucks imho...for online help i think it would be easier to have once massive pdf to search through all modules....rant rant....):bounce: pet hate....

[JIII]

just check out the tutorials section or go here.

http://www.peranders.com/c4d8/

good tutorial on DOF.

[handige_harrie]

I didn't think about using a plane, but it does save a lot of time.

I used stochastic mode because I like the grain, the easy settings and no color bleeding.

But regular radiosity is a lot faster, I did some tests (about twenty different settings) and came up with the best quality-speed settings:

Strength: 100%
Accuracy: 90%
Prepass Size 1/1
Diffuse Depth 1
Stochastic Samples 200
Min. Resolution 15
Max. Resolution 30

320x240 took 19 seconds

The picture above with in stochastic mode took more than 3minutes.

[Kotayus]

groove busses! thanks thats the ticket.

[ThirdEye]

Originally posted by handige_harrie
I didn't think about using a plane, but it does save a lot of time.

I used stochastic mode because I like the grain, the easy settings and no color bleeding.

But regular radiosity is a lot faster, I did some tests (about twenty different settings) and came up with the best quality-speed settings:

Strength: 100%
Accuracy: 90%
Prepass Size 1/1
Diffuse Depth 1
Stochastic Samples 200
Min. Resolution 15
Max. Resolution 30

320x240 took 19 seconds

The picture above with in stochastic mode took more than 3minutes.


You can lower min res to 5 imo, i nearly never use less than 2 bounces, for interior scenes i increase dd to 10

[handige_harrie]

Originally posted by ThirdEye_01
You can lower min res to 5 imo, i nearly never use less than 2 bounces, for interior scenes i increase dd to 10

Lowering min res does not always win you time. In case of the settings above it does, lowering min res to 5 took 3 seconds of the rendertime.

I found out that with higher dd (and probably other variables) setting the min res to 1/2 of the max res setting gave the fastest result. You can see the difference of 7seconds in the last two results.
Maybe MV wrote something about this in his radiosity tutorial, I'll check in a moment.

I like the very dark shadows you get by setting dd to 1, and it saves quite some time.

=================
Strength: 100%
Accuracy: 90%
Prepass Size 1/1
Diffuse Depth 1
Stochastic Samples 200
Min. Resolution 15
Max. Resolution 30

320x240 took 17 seconds (this time with no other apps running on background, hence the 2 seconds less)
=================
...
Diffuse Depth 1
Min. Resolution 5

320x240 took 14 seconds
=================
...
Diffuse Depth 2
Min. Resolution 5

320x240 took 54 seconds
=================
...
Diffuse Depth 2
Min. Resolution 15

320x240 took 47 seconds

[handige_harrie]

Originally posted by handige_harrie
I found out that with higher dd (and probably other variables) setting the min res to 1/2 of the max res setting gave the fastest result. You can see the difference of 7seconds in the last two results.
Maybe MV wrote something about this in his radiosity tutorial, I'll check in a moment.

Found it :)

written by MV in his tutorial
We can decrease the min samples even more with pretty similar results. Click the picture to see the point sample pattern now. You can see that the corners have many samples while the wall centers have few. But look at the render time. The time has nearly doubled without a better result. The reason is because Cinema interpolates between the relatively few samples to smooth things out. In some cases, not all, using fewer samples can give you a smoother result because of this. The problem is this interpolation takes time and you may end up taking longer to render with the same or even inferior results.

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