As I slowly approach the operational realization of my computational/visualization lab, I received your lovely holiday card. This seriously elevated my dreams of larger scale possibilities for chemistry and biology students through the cellPack resources. In playing with it, I found myself wanting a more robust version of a clipping plane which would have several characteristics: 3 dimensional - take a cell and hack out 1 or 2 adjoining octants relative to its center to give a sliced view similar to what is found in some texts (also often used in geology books to depict the earth's internal structure--see http://www.the-science-site.com/earths-interior.html for an example). Being able to leave the nucleus alone while the surface strips away the cytoplasm would be cool, much like the referenced image above showing the core of the earth. Likely a difficult one to actually implement? Have the clipped surface not be flat, but rather allow a component to stay visible as the surface is moved past it until some determined relationship at which point it vanishes (perhaps when it has passed entirely through the clipping surface?). The clipped surface would thus show structure of a sort. Have the choice of the clipping surface being static with the assembly (it could rotate with the assembly, keeping the same internal view), or separately static (how a clipping plane behaves now--as I know it--where rotating the structure causes things to move through the unmoving plane. One approach I can imagine would be the use of a spherical or ellipsoidal (?) surface of specific size at a specific distance from the center of the cellular assembly. Is this already implemented in a way that can be manipulated to achieve at least the major aspects of this effect (e.g. logical ANDing of clipping by 3 intersecting planes)? Sorry for the long question... ;-/ Kenward -- In a completely rational society, the best of us would aspire to be _teachers_ and the rest of us would have to settle for something less, because passing civilization along from one generation to the next ought to be the highest honor and the highest responsibility anyone could have. - Lee Iacocca