Two substances are very close , and render the black .

[jeremybirn]

Could you ask your question in other words? It is hard to understand.

Did you mean why is there a shadow between adjacent surfaces, or why are there banding artifacts in your shading?

-jeremy

[ningni]

Yes!Did you mean why is there a shadow between adjacent surfaces!! Why!!

[jeremybirn]

It looks as if either one of your lights is set to cast shadows, or you are rendering with final gathering or global illumination - is none of that true?

-jeremy

[ningni]

My only one lights is set to cast shadows.
Did you mean why is there a shadow between adjacent surfaces!! Why!!

[rollmops]

It's a bit like a shadows addition.
You may try to decrease Dmap Bias by a small amount for the shadow casting light.
You also may use raytraced shadows to avoid these artifacts.

offtopic: I love this model!:thumbsup:

[ningni]

Thank all! I attempt .

[ningni]

Thank rollmops!! Problem determination

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