Defined color change for shape's intersection

As a tool for design development, a specific color change for shape intersections (of e.g. 2 partly overlapping shapes) would be great (at least at same z -level). Or ideally, even a new shape rule for the shapes' intersection (thus allowing automatically new color definitions) would be interesting. Don't see it yet with CF2, and will CF3 bring it ?

What kind of color change on shape intersection? If the shapes are not opaque then there will be color blending where they overlap.

Wassilij Kandinsky is using many times a display mode where the shape's
intersections have a - wanted & defined different color - not just the non-opaque superimposition of colors - http://www.google.de/search?q=wassily+k ... 96&bih=573

Simple example - 2 square shapes turned 90 degrees overlapping to form a cross. For opaque shapes the quadratic center's color is either shape 1 color or shape 2 color depending on z plane, or superimposed if non-opaque. My idea is that for such shape's intersection one can define specific colors which are not derived from either shape 1 color or shape 2 color. Right now I only can rebuild the overlapped shape with defining a new shape of same form to give it a specifically wanted color. Example again - square shapes forming a cross. Square shape 1 is red, shape 2 is green. The quadratic center overlap for opaque case is either red od green, depending on +/- z chosen. For non-opaque shapes the superimposed quadratic center is of combined red & green color - whatever outcome. But I wish to have the quadratic center straight blue. Today I only can define an extra quadratic shape of the overlapping center and give it the blue color. In an ideal advanced case the overlapping shape of shapes to create a newly defined shape which then can get transformed in whatever way - e.g. color attribute, even size etc.. This would be my idea. Other example - two circles overlapp. The cross section has a lense shape. This lense shape to be created by CFx on demand of user, allowing redefining color and other attributes, even shifting for e.g. further transformations.

A general overlapping shapes feature would violate the context-free nature of Context Free. But there could be some sort of primitive shape combining feature that takes the scan-lines from several primitive shapes and combines them with boolean operators (union, subtraction, intersection, and exclusive-or).

  Code:

shape cross {
    <vbar - hbar>[vertical color]
    <hbar - vbar>[horizontal color]
    <hbar * vbar>[intersection color]
}

I don't think that I want to delay Version 3 to implement this though.

Thank you for reply. I don't want that my idea distracts you into a delay of CF3 which the community is awaiting with high attention. Anyhow - a big THANK YOU for all your work done. So I suggest to close the topic - OK?