What is a ʼSub-layerʼ in Rhino?

ByCADbrief Staff

Short Answer

A sub-layer in Rhino is a child layer nested under a parent layer to organize objects in a clear hierarchy. The fastest professional method is to create it in the layers panel using Layer and drag it under a parent layer or use New Sub Layer. Limitation: sub-layers inherit structure, not object properties automatically.

What You Need to Know Before

Warning: If a parent layer is turned off, locked, or hidden, its sub-layers are affected in practice and objects may seem to disappear unexpectedly. This is a common source of selection and visibility errors in large Rhino models.

How to Create a Sub-layer

  • Command: Layer

  • Shortcut: None by default

  • Quick Steps:

    1. Open the Layers panel from the right-side panels or via Panels > Layers.
    2. Right-click the parent layer and choose New Sub Layer, or create a new layer and drag it onto the parent layer.
    3. Rename the sub-layer and set a real option such as Visible, Locked, or Color in the layer properties.

Variables & Settings

  • Key Setting: Visible / Locked / Color in the Layers panel

  • Expert Setting: These layer properties control how the sub-layer behaves in the model. A sub-layer can have its own color and lock state, but if the parent layer is off, the sub-layer will not display regardless of its own visibility setting.

Why it Fails

  • Cause 1 (Geometry): Objects may be placed on the wrong layer, so the expected sub-layer appears empty.
  • Cause 2 (Layers/Locks): The parent layer is hidden or locked, which prevents normal display or editing of objects on sub-layers.
  • Cause 3 (Command/Logic): Users often create a regular layer instead of nesting it, so the hierarchy is not actually established.

Quick Fix & Best Practice

  • Quick Fix: Use the Layer command, then drag the layer directly beneath the correct parent in the Layers panel until it indents as a sub-layer.
  • Manager’s Verdict: Use sub-layers for large Rhino projects, naming by system or discipline. Avoid over-nesting, because deep layer trees slow navigation and increase visibility mistakes.

FAQ

Can a sub-layer have its own color in Rhino?

Yes, a sub-layer can use its own layer color.

What happens if the parent layer is turned off?

All sub-layers under it will effectively be hidden as well.

Can I move objects from one sub-layer to another?

Yes, select the objects and change their layer in Properties or move them through the Layers panel.

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