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Sketchup Round Corner Crack Top 【Top 20 QUICK】

If you are a 3D modeler, product designer, or architect using SketchUp, you have likely experienced that frustrating moment of imperfection. You apply the Round Corner plugin (by Fredo6) to a cube or a cylinder, hoping for a smooth, pristine fillet. But instead, you look at the top face and see it: an ugly, unwanted crack.

This phenomenon, known colloquially in forums as the "SketchUp round corner crack top," is a common yet fixable geometry error. It appears as a jagged tear, a missing face, or a visible seam running across the uppermost surface of your model.

Why does this happen? More importantly, how do you fix it without scrapping hours of work?

In this comprehensive guide, we will dissect the causes of the dreaded "crack top," provide step-by-step repairs, and show you how to prevent it from ever happening again.

Cracks often look like visible lines due to the "Soften Edges" setting.

In the Round Corner toolbar, look for the Offset type (usually under Advanced settings). sketchup round corner crack top

Use this if you applied Round Corner to the top edge of a cylinder/box and it created a pinched or broken face on the top.

Title: Round Corner creating a "cracked" or faceted top surface? (Fix inside)

Body: I’m having an issue with the Round Corner extension (by Fredo6). I applied a rounded edge to the top of a cylinder, but instead of a smooth fillet, the top face is cracking / showing triangulation artifacts.

The Problem: After running Round Corner, the top planar face develops weird lines, "cracks," or refuses to stay flat. It looks like the mesh is pinching at the center.

Troubleshooting so far:

Does anyone know how to keep the top face clean? Is this a geometry limit of SketchUp, or am I missing a setting in the Round Corner parameters?

Solution I found (Posting for others): Nevermind, figured it out. You need to toggle the "Triangle Mesh" option OFF (or ON depending on the shape) in the Round Corner parameters. Alternatively, applying the round only to the vertical edge and leaving a tiny inset lip prevents the crack.

If RoundCorner keeps cracking your tops, the current modern alternative is BoolTools 2 (by ThomThom). It uses a different boolean engine that is often more robust at handling intersections without cracking, though the workflow is slightly different (you subtract shapes rather than selecting edges).

If you want to make a rounded corner look like it has been chipped, damaged, or cracked, follow these steps:

Prerequisites:

Steps to create the crack:

  • Create the Void:
  • Add Realism (The "Top" Detail):
  • Texture:

    • Most users rely on Fredo6 RoundCorner (the industry standard). This plugin has three modes: Sharp, Round, and Bevel.

    The "Round Corner Crack Top" usually happens because of Overlapping Intersections. When two rounded edges meet at a 90-degree corner at the top of an object, the plugin creates two different arcs that try to occupy the same space. If the arc segments aren't perfectly matched, SketchUp’s inference engine throws an error, leaving a "crack" (a missing line or face).

    The specific culprit: Subdivision smoothing at the poles. If you are trying to create a sphere-like top from a low-poly cylinder, the algorithm reaches a singularity (a pole) where dozens of edges meet. SketchUp hates poles. It will crack every time.