Complete training in Rhino 9, from the interface to rendering and printing. Work through it in order, test what you’ve learned, and earn a certificate.
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Tutorials & Guides
Tutorials, videos, and guides focused on individual skills and tools. Use them in any order, as you need them. Filter by topic, level, or format.
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The Command Quick Reference is a searchable A–Z of every Rhino command with syntax and options, for when you need a quick answer.
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Discussion Forum
Ask questions, share files, and search a decade of answered problems.
Model failing right before a deadline? Let’s fix it fast.
The quick answers below cover the problems that trip up most people. Still stuck? Reach a human on the right.
Why does my Boolean operation fail or blow surfaces apart?
Booleans need clean, correctly intersecting geometry. Run Check and ShowEdges first: look for naked edges, bad objects, coincident or coplanar faces, and surfaces that only touch instead of fully passing through each other. If you’re working with open surfaces, use Dir to make sure the normals point the right way. Fix those, then try the Boolean again.
My fillet won't build. What can I do?
Fillets fail most often when the radius is too large for the adjacent geometry, on surfaces with poor continuity, or where edges are shorter than the radius you asked for. Try a smaller radius, fillet fewer edges at once, or rebuild the underlying surfaces first.
My surfaces look jagged, or the shading is wrong. What happened?
The geometry is usually fine. It’s the render mesh that’s coarse. Adjust the render mesh settings (or move the smoothing slider toward smooth) so curved surfaces display smoothly. This doesn’t change the actual NURBS surface. If the shading looks dark or inverted, check for flipped normals with Dir and run Check for bad objects.
Why isn't my object closed? How do I get a solid?
A closed solid has no naked edges. Use ShowEdges to highlight open boundaries, then Join matching edges, use Cap to close planar holes, or rebuild the gaps. Once every edge is joined, the object reports as a closed polysurface (confirm with What or the Properties panel).
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