@alexranieri67 wrote:
The program does not accept color each surface of my landfill with a different color I have to do?
For every surface you create, you apply a style. In this case, most likely you are using the same style for all of them.
Changin layer properties won't do cause all the surface will use the same changed layer.
You can either:
- create styles (for example) LANDFILL1, LANDFILL2,ect...and assign different layers in the DISPLAY tab of the surface properties (name the layers correspondignly...surface1majorcontours (and minor), surface2majorcontours (and minor))
- go to the display tab of each surface and MANUALY change the colours of the layers. This way you only need one style, but more manual work if you change something.

- do elevation analisys and use a different colour set for each surface

- assign materials and change visual display
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