A Rhino file, opened without Rhino.
Open a Rhino 3DM file in your browser with nothing uploaded: its meshes, surfaces, blocks and layers, measured at the size the file says.
By Suraj Kumar4 min read
Rhino's .3dm files come from jewellers, architects and product designers. KeepSimp opens them in your browser with openNURBS, Rhino's own open library.
Drop the 3DM file.
Open the 3DM viewer and drop the .3dm file. It is read by rhino3dm, McNeel's openNURBS compiled to run in the browser and downloaded from KeepSimp the first time (about 1 MB). Objects are listed under their layers, in their colours, at the size the file says; blocks are drawn wherever they are placed.
Surfaces show through Rhino's display mesh.
openNURBS reads Rhino's surfaces but cannot cut them into triangles itself, so a surface shows through the display mesh Rhino saved with it. A file saved with "Save small" has none: its surfaces are left out, and the page counts them. Save it again in Rhino with Save small off, or export a STEP, and open that.
Meshes and point clouds always show. SubD shapes are drawn from their cage smoothed three times, close to Rhino's surface but not exactly it; hidden objects and curves are left out and counted.
Pass it on.
Choose Change the format to write what is shown as a GLB, an OBJ or an STL for a printer, at its real size.
Before the file is offered, KeepSimp opens it again with its own reader and measures it; a file that does not match the model is not offered, and the page says what was wrong.
Further reading
Topics: open 3dm file · 3dm viewer · rhino file viewer · open rhino file without rhino · 3dm viewer online
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