We first posted the Contour Tool back in June 2010 and it’s time for an update:
By selecting a surface in Grasshopper, the original definition sped up the process for creating laser cut physical models. But at the beginning of projects, we’re almost always dealing with a mesh, as either a toposurface from Revit or geometry from Sketchup. This updated definition works with surfaces, polysurfaces, and meshes.
Toposurfaces from Revit or SketchUp can be ugly in Rhino. By ugly, we mean that they have naked vertices, overlapping faces, etc. These types of meshes are a major problem when trying to create regions from contour lines, so this definition ignores region creation. Rather, groups are created by their vertical position and the same approach of the original contour definition is used to separate the file into a fixed number of sheets. The updated definition is below, feel free to comment with questions.
Download Contour Tool 2, 4.38 MB
Obligatory disclaimer: the author does not guarantee that these parametric models are bug-free or that they will solve all of your problems. If you find bugs or have suggestions for improvements, please let us know.