Rhino 3D Tip: Creating Precise Linear Arrays with ArrayLinear in Rhino

One-dimensional arrays are an efficient way to duplicate geometry at consistent intervals along a straight path. In Rhino, use ArrayLinear when you need repeated components such as louvers, fasteners, fence posts, perforations, ribs, or structural bays.

Begin by modeling and positioning one accurate “seed” object. Its insertion position, orientation, and size will define every copy, so take a moment to confirm its location with object snaps and the Gumball before creating the array.

• Select the object or objects to repeat.
• Run ArrayLinear.
• Specify the start point for the array direction.
• Specify a second point to establish the direction and spacing.
• Enter the required number of items.

The two points used to define the direction do more than establish an axis: the distance between them establishes the spacing between successive copies. For example, to place vertical posts every 1200 mm, select the first reference point, then enter or snap to a second point exactly 1200 mm away. If you need 10 posts, enter 10 items; Rhino creates the original plus the additional repeated instances as part of the array result.

For precise architectural or fabrication work, use numerical input rather than estimating distances visually. You can establish the direction by typing a relative coordinate, such as 0,1200,0, or by constraining the cursor along an axis with Ortho. This approach is especially useful when the copied objects must align with the model’s world X, Y, or Z directions.

A strong workflow is to use construction geometry first. Draw a line that represents the desired run, verify its length, and use its endpoints or intermediate reference points to drive the array. This reduces the risk of placing a repeated element in an incorrect direction or accidentally using an inconsistent spacing value.

• Use Object Snaps: Snap to endpoints, midpoints, grid intersections, or reference geometry for reliable placement.
• Check the object count: Determine whether your intended quantity includes both end conditions before running the command.
• Array groups or blocks: If each repeated module contains several objects, group it or make it a block before arraying. Blocks are particularly valuable for large models because editing the block definition updates every instance.
• Work on the correct layer: Put the source component on its intended layer before duplication so the resulting copies remain organized.
• Use History deliberately: When appropriate, enable Record History before creating dependent geometry, but do not rely on history as a substitute for clean model organization.

After creating the array, inspect it in an orthographic viewport. A perspective view can make equally spaced objects appear uneven, particularly on long runs. Use Distance to verify a few intervals, and use SelLast immediately after the command if you need to move, group, assign a material, or convert the newly created items into a block.

Do not use a linear array when the repetition must follow a curved path. In that case, ArrayCrv is usually the better command because it distributes copies along a curve and can orient them relative to the curve direction. Similarly, use ArrayPolar for radial repetition around a center point.

For Rhino tools, training, and workflow resources, visit NOVEDGE’s Rhino collection. A disciplined ArrayLinear workflow turns repetitive modeling from a manual task into a fast, measurable, and easily editable operation.

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