RTOPO - Version 3.1 Simple, powerful and inexpensive CAD software for surveying. You can do triangulation, isolines, color-filled contour maps, sections, intersections, volume and much more. You can process hundreds of thousands of points or triangles, even on less powerful PCs.Through its own CAD system (called RCAD), specialized for 3D and for a large number of entities, you can:-load and draw a file of points having the format: Number X Y Z Code; the drawing is made by POINT,3DPOLY,SPLINE or BLOCK entities, according to a modifiable library of codes-edit interactively the points; you can modify the coordinates, the code and the position (in 3DPOLY or SPLINE)-triangulate the points on a convex hull or between an external contour and possibly more interior contours-do isolines (contour lines) and color-filled contour map-do cross sections and longitudinal profile-do the projection of several PLine entities over a triangulation