Intersect is also very useful for joining the "skins" of primitive objects, especially useful for glass like the one above. There are two things i used intersect for. See the lightly curved lip on the top of the glass? That is 2 cones, one positive and one negative, AND a sphere resting just over the edge of the positive cone set to intersect. What it then does is render all faces within the sphere, and because a few of them were curved off by the placement of the sphere, the lip looks smoothly curved. I also used intersect for the stem of the glass. it is two cones, one upside down, both stretched to the same length. Now normally, you would see a bow tiew where they touch, but i set them to postive and made another sphere set to intersect. This way bryce only renders the outside faces, so the internal unwanted bowtie is circumvented.