procedure sb2srf
This subroutine plots a 3-d surface given a 2-d unit-cell of density. All (x,y,z) values are taken to be given in world coordinates. The z-component of the eye-poisition should be positive and that of all the lattice-vertices should be negative; the viewing-screen is fixed at z=0.
Syntax
sb2srf EYE,LATICE,DENS,N1,N2,DLOW,DHIGH,DVERT,IC1,IC2,NCBAND,LIGHT,LSHINE
Arguments
| ARGUMENT | TYPE I/O DIMENSION DESCRIPTION |
| EYE: | R*4 I 3 (x,y,z) coordinate of eye-position. |
| LATICE: | R*4 I 3 x 3 (x,y,z) coordinates of the origin |
| and the a and b lattice-vertices. | |
| DENS: | R*4 I (N1+1) The density at regular points within |
| x (N2+1) the unit cell, wrapped around so | |
| that DENS(0,J)=DENS(N1,J) etc.. | |
| N1,N2: | I*4 I - The dimensions of the unit-cell grid. |
| DLOW: | R*4 I - Lowest density to be plotted. |
| DHIGH: | R*4 I - Highest density to be plotted. |
| DVERT: | R*4 I - "Vertical" world-coordinate length |
| corresponding to density-range. | |
| IC1,IC2: | I*4 I - Lowest and highest colour-index to |
| be used for the rendering. | |
| NCBAND: | I*4 I - Number of colour-bands for the |
| height, so that the number of shades | |
| per band = (IC2-IC1+1)/NCBAND. | |
| LIGHT: | R*4 I 3 (x,y,z) direction of flood-light. |
| LSHINE: | L*1 I - Shiny surface if TRUE, else diffuse. |