Gradient patterns

We now do have circular patterns and square patterns.
Would be a powerful addition to have gradient patterns.

Would allow us to make groups of skechtes or solids with a variation of number of itens and the distance that the occurrence of these items decreases.

This feature should allow us to make groups of objects that fades/become sparse in one direction

Without this, this kind of screening/gradient of occurrences has to be made by hand, one by one.