Computer generated β’ colour plotting iii printer plotter called Spectrum has been announced by Versatec. Accord-~ ing to Versatec, the Spectrum can operate as a full colour plotter or line ~!~i ~ ~ printer oritcanserveasacolouror monochrome CRT hard copy device using an optional video interface. Faulted structure -top surface view generated by 15/14 Colour output is on 297 mm wide paper or polyester film media at Interaclive sure 2 in/s with a resolution of 200 dots/in An interactive surface modeller (ISM), developed by Northwest Digital (dpi). It has an automatic media cutter for standard A3 or A4 size plots. It Research in Vancouver, USA, has been made available in Europe by Modus uses Versatec's Versaplot software to Marketing p/c. offer 256 predefined plus 256 user-ISM generates models from data that is represented as Cartesian coordinates, defined colours, available from a Information may be extracted in various forms." contour plots in plan view or palette of 1000. 3D perspective view," interpolations of the z value at any (x,y) position; grid According to Versatec, the Specplots of the surface in 3D perspective view and volume calculations. trum can produce full colour A4 Users can ca//up a contour plot, when in the interactive mode of ISM, and size plots in approximately 60 s edit the plot by either adding or deleting data points. The contours are then and monochrome plots of the same regenerated, size will take only approximately 5 s. ISM is available in two forms." the ISM workstation and the ISM library. (Versatec Electronics Ltd, 5 Oxford The workstation is a ready-to-use mode/ling package which includes a user interface based on windows. It runs on Hewlett-Packard workstations. It Road, Newbury, Berks RG I 3 I QD, UK. Tel: (0635) 42421) requires no programming skills to use in this form, according to Modus. The ISM Library is a suite of subroutines that can form the basis of lSM's surface modelling capability. The Library is currently implemented in both Fortran 77 and Pasca/. in this form, it is ca/led by user written procedures.