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Hi

In another thread a user say's: "NEVER use Lamberts for actual scenes unless you're testing geometry. Just for everyone, the First Commandment is DO NOT USE LAMBERTS THEY ARE NON-PHYSICAL."

What are Lamberts in Maxwell and how can i avoid them?

Thx

You create a Lambert by setting a BSDF in your material to Roughness = 100.0. To clarify the meaning of that quote, it is not so much that such materials are 'non-physical' (this is Maxwell, after all), but that pure lambertian surfaces may only exist in theory, and as such, may be considered to be rather 'non-realistic'. To get a working idea of what this means, try this:

1. open MXED
2. right-click Material Properties in the layers tree
3. choose Add Layer; a new Layer and BSDF are added
4. set the BSDF's Roughness to 100.0
5. right-click the material preview
6. go to Select Scene > stage1
7. refresh the preview
8. right-click the material preview
9. click 'Store'
10. set the BSDF's Roughness to 99.0
11. refresh the preview again
12. right-click the material preview
13. click 'Store'

Now, you can compare the two stored versions by clicking the Back/Forward arrows near the bottom-left of the material preview (it should say 2/2, indicating that there are two material-states stored). As you will see, the difference between lambert and non-lambert is noticeable, and this can make quite a difference on your rendered scenes.

JDHill wrote:You create a Lambert by setting a BSDF in your material to Roughness = 100.0

That was all i want to know.

Thank you.

Lambert is strictly physically correct, it's just not naturally available.

tom wrote: Lambert is strictly physically correct, it's just not naturally available.

I should have named my son Lambert, so then it would be naturally available?

As soon as he's dispatched, the material would converge to Rough Looney

well we have this comic guy in France on TV... dunno if that counts...

http://fr.wikipedia.org/wiki/Jonathan_Lambert

I've been watching these non stop when I was a kid... hihi..

naaahhh..

there can be only one

ahhhh Christophe !