Can I select all objects of the same color at once in Rhinoceros 3D?

ByCADbrief Staff

Short Answer

Yes — in Rhino 3D, you can select all objects of the same color at once by using SelColor, which is the fastest and most common professional method for color-based selection. Pick a source object or specify the target display color, and Rhino selects matching visible objects. It may not catch objects on locked or hidden layers.

What You Need to Know Before

Warning: Rhino color selection depends on the object’s actual display color source. If objects are set to “By Layer” or “By Parent,” identical-looking objects may not all select unless their effective display color truly matches and the objects are visible/unlocked.

How-to

  • Command: SelColor

  • Shortcut: SelColor

  • Quick Steps:

    1. In the Command line, type SelColor and press Enter.
    2. Choose the color to match by clicking an existing object or defining the target color in the color picker.
    3. Press Enter to select all matching objects in the current model view/state.

  • Use the fastest professional workflow: select by display color directly instead of manually filtering layers or object properties.

Variables & Settings

  • Key Setting: object color source (By Layer, By Parent, or explicit object color)

  • Expert Setting: If an object appears red but gets that color from its layer, Rhino may still behave differently than with objects explicitly colored red at object level. Check Properties > Object > Display Color before relying on color-based selection in production files.

Why it Fails

  • Cause 1 (Geometry): Some objects only appear to match because of display mode, material, or parent assignment, but their actual selectable object color is different.

  • Cause 2 (Layers/Locks): Objects on hidden, locked, or off layers will not be selected in normal workflows, even if they share the same color.

  • Cause 3 (Command/Logic): The command matches color, not object type or material, so blocks, grouped objects, or nested content may not behave as expected for all visible instances.

Quick Fix & Best Practice

  • Quick Fix: Run What or inspect Properties on a sample object first to confirm whether the color is set by object or by layer, then use SelColor again.
  • Manager’s Verdict: Use color-based selection only for clean, standards-based files. In team workflows, layer-based organization is more reliable than object color for bulk selection and editing.

FAQ

Can I select objects by layer color in Rhino?
Yes, but only if the visible object color actually resolves to that layer color.

Does SelColor work on hidden objects?
No, hidden objects are not selected in normal use.

Can I use this on block contents?
Not reliably for nested block geometry unless you edit the block content directly.

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