functions in slice3.i - p

             pl3surf, nverts, xyzverts  
          or pl3surf, nverts, xyzverts, values  
 
     Perform simple 3D rendering of an object created by slice3  
     (possibly followed by slice2).  NVERTS and XYZVERTS are polygon  
     lists as returned by slice3, so XYZVERTS is 3-by-sum(NVERTS),  
     where NVERTS is a list of the number of vertices in each polygon.  
     If present, the VALUES should have the same length as NVERTS;  
     they are used to color the polygon.  If VALUES is not specified,  
     the 3D lighting calculation set up using the light3 function  
     will be carried out.  Keywords cmin= and cmax= as for plf, pli,  
     or plfp are also accepted.  (If you do not supply VALUES, you  
     probably want to use the ambient= keyword to light3 instead of  
     cmin= here, but cmax= may still be useful.)  
interpreted function, defined at i/slice3.i   line 1082  

             pl3tree, nverts, xyzverts  
          or pl3tree, nverts, xyzverts, values, plane  
 
     Add the polygon list specified by NVERTS (number of vertices in  
     each polygon) and XYZVERTS (3-by-sum(NVERTS) vertex coordinates)  
     to the currently displayed b-tree.  If VALUES is specified, it  
     must have the same dimension as NVERTS, and represents the color  
     of each polygon.  If VALUES is not specified, the polygons  
     are assumed to form an isosurface which will be shaded by the  
     current 3D lighting model; the isosurfaces are at the leaves of  
     the b-tree, sliced by all of the planes.  If PLANE is specified,  
     the XYZVERTS must all lie in that plane, and that plane becomes  
     a new slicing plane in the b-tree.    
     Each leaf of the b-tree consists of a set of sliced isosurfaces.  
     A node of the b-tree consists of some polygons in one of the  
     planes, a b-tree or leaf entirely on one side of that plane, and  
     a b-tree or leaf on the other side.  The first plane you add  
     becomes the root node, slicing any existing leaf in half.  When  
     you add an isosurface, it propagates down the tree, getting  
     sliced at each node, until its pieces reach the existing leaves,  
     to which they are added.  When you add a plane, it also propagates  
     down the tree, getting sliced at each node, until its pieces  
     reach the leaves, which it slices, becoming the nodes closest to  
     the leaves.  
     This structure is relatively easy to plot, since from any  
     viewpoint, a node can always be plotted in the order from one  
     side, then the plane, then the other side.  
     This routine assumes a "split palette"; the colors for the  
     VALUES will be scaled to fit from color 0 to color 99, while  
     the colors from the shading calculation will be scaled to fit  
     from color 100 to color 199.  (If VALUES is specified as a char  
     array, however, it will be used without scaling.)  
     You may specifiy a cmin= or cmax= keyword to affect the  
     scaling; cmin is ignored if VALUES is not specified (use the  
     ambient= keyword from light3 for that case).  
interpreted function, defined at i/slice3.i   line 1145  

 pl3tree_prt  
 
  
interpreted function, defined at i/slice3.i   line 1432  

             plane3(normal, point)  
          or plane3([nx,ny,nz], [px,py,pz])  
 
     returns [nx,ny,nz,pp] for the specified plane.  
interpreted function, defined at i/slice3.i   line 49