True ambience is a render setting, the ambient texture part I was talking about is the lozenge yeah. True ambience is a different method of calculating ambient light. What happens during a non-ta render is that an object wil get ambient light at a constant intensity all over it's surface, the result is a flat looking object. With TA the ambient light is calculated with lightrays actual lightrays rather then just a constant value. with TA, light casted on an ambient surface will bounce off again and this bounced light can then hit other surfaces where it effects the lighting of that surface too. The effect is much like the rather famous "radiosity" render techniques. The intensity of the bounced light depends on the intensity of the ambient channel in the texture of each object.

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