Category Archives: Rhino guides

Rhino, Network Surface and Sweep commands are bad for surfacing

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“That’s a hard pass dog”. Watching this video made me realize that some of surfacing I was doing was causing me issues. Network Srf and sweep surfacing generated too many points. This issue caused too many issues when trying to match curve and also creates bumps and seamlines showing up. Bandaid the fix using the dirty joinedge command that corrupts surfaces. Solution, Use “EdgeSrf” and “Loft” commands instead. I can use the same curve structure that I found, just need different surfacing tools. This will help me keep my surfaces smoother and water tight. Way cleaner using EdgeSrf” below. Curves in Surfaces out!

neck rebuild

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Further inspection I noticed small division lines on neck profile surface that needs a rebuild.

When I set up first neck profile, the match curve extended past the outline, creating this miniature hump in the zebra analysis. I noticed the profile was bulging out past outline and my top surface of neck was not on original guideline. Which is fine, I ran so many commands that it was inevitable that somethings would move. It’s bad design when you have to use the dirty “JoinEdge” command when closing naked edges.

Shouldn’t take too long, since I know exactly what to do and not experimenting on how to design it rhino. Good practice anyways. Since I moved the neck up for zero tilt, I have to relocate the original fret2find outlines. using the “What” command I can find how much I moved it off z, which was exactly .204″. Used “Setpt” command to set z of outlines again.

Also setting the nut properly. I used the “Extend” command to extend outlines. I created the two nut lines to 4mm thickness with osnap set to near. I eyeballed it last time. Should be tighter this time. I think I may choose to move that first neck profile back maybe a quarter inch to give the network surface more smoothness. Another idea might be angling the neck profile, may be trickier, prolly set cplane to 14 mm box guide. Have to be super precise with the Nut, everything follows it. Highline guitars was right, a fucked up nut, fucks everything up. More important than the neck joint or finishing.

G1 G2 Neck continuity, clean surfaced neck Rhino3d

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Finally happy with the neck surfacing, Redid everything from scratch again. Try to list what I did. I feel I will forget this unless I keep practicing to make better

Four main parts to Modelling the neck
1. Heel
2. Neck profile
3. Volute section
4. Headstock

1. Heel section (dark blue curves)
Did the Highline Guitars method but instead of patching it I ran Network surface. 2 curves at base and of heel and end of neck profile and 6 guide curves, drawn carefully, tweaked curves manually. Try to keep curves straight in top view. 2 rail sweep could work also. Sometimes one works better than the other.

2. Neck profile (light blue curves)

  • Set up 2 main profile curves- He used the mirror technique, but since this is asymmetrical neck, couldn’t use that exact method.
  • I created a guide box in top view 14mm in height and 14.5mm for bottom profile.
  • Drew out a 3 degree curve for each half of profile, then match curved it to G2 specs.
  • Ran the first network surface. with 2 profile curves and 3 straight rails down the neck.
  • Created more guide curves, instead of dividing and sectioning and redrawing manually like Helix, I used the Extract Isocurve command, changed direction to generate the guide curves, way easier this way.
  • Deleted surface.
  • Created 2 more guide curves by the volute, I copied my first 14mm neck profile curves, manually snapping each curve, using gumball relocate and creating a points to snap to center line where the volute starts. Used rotate and scaled manually to snap to points.
  • Rerun Network surface with curves. Surface should go from top of the guitar nut to the heel.

3. Volute Section- (red curves)

  • Set up guide curves by creating points along curve that the truss rod comes out of. Also setup points on bottom of Volute along the isocurves.
  • Draw one curve for each section from the truss rod curve and bottom of volute. Do this for each side and then connect the curves with blendsrf, I think I used the tangent setting for this. Didn’t edit the blendsrf points. But I did have to adjust the first two guide curves manaully. Create straight line then used the “Change degree” command to 3 and adjust the curve points manually in top view.
  • Joined the curves together, think blendcrv can do this automatically.
  • Ran network surface- When picking edges, select surface edge for the first curve, this will allow you to tweak that first curve with the curvature setting.
  • Split or trim off with the extruded bottom of volute or whatever planar surface you want to use.

4. Headstock

Just extruded from original drawing- Elliots method. Or use Guides to create thickness and the dup edges or create edges manually nothing too hard here.