For a top face to remain solid, all its bounding edges must lie on the exact same flat plane. If your original model has even a microscopic warp or a misplaced vertex on the top surface, the RoundCorner plugin will split the face into a web of triangles or fail to generate a clean top skin.
Is the top face a or a complex, curved shape ? Share public link
The gold standard for edge modification. It provides real-time previews and allows you to set precise offsets and segment counts. sketchup round corner crack top
SketchUp is a , not a "solid" or NURBS modeler like SolidWorks or AutoCAD. This means it represents all surfaces as a mesh of connected polygons (triangles and "ngons"—polygons with more than four sides). While powerful for architectural and design visualization, this polygon-based system has inherent limitations, especially when creating highly detailed, curved geometry.
Take a deep breath, scale up your model, reduce your segments, and enjoy those smooth, crack-free edges. For a top face to remain solid, all
Before running any rounding scripts, ensure your top surface is 100% flat.
Sometimes the fix is in the user interface rather than the geometry. When you open the RoundCorner options panel, try adjusting these parameters: Share public link The gold standard for edge modification
Fixing the "Cracked Top" in SketchUp Round Corner It’s a classic SketchUp headache: you run a Round Corner plugin to add that perfect bit of realism to your model, only to find the top face has "cracked," leaving behind jagged lines, missing geometry, or tiny holes. This usually happens because of SketchUp’s built-in 1/1000th-inch tolerance—it simply refuses to create edges that are too small.
Delete unnecessary interior edges, coplanar lines, or isolated vertices using the tool.
If your top face isn't perfectly flat, the Round Corner tool will struggle to "heal" the surface, resulting in a fractured look. How can I fix the hole in this model - SketchUp Forums