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Blender 5.0+ Updated

Corner Junctions: 3-Way Fillet Solution

The art of smoothly joining two ramps and the floor in challenging corner areas for arena or interior designs.

Placing a ramp (quarter cylinder) along a straight wall works fine. However, in a corner where two walls meet, ramps coming from different directions overlap, creating sharp and ugly edges. The solution is to place a "transition element" at this corner.

Only a sphere part can provide the smoothest transition at a point where three different axes (X, Y, Z) meet:

  • Add a Sphere: Shift + A -> UV Sphere.
  • Cut it down: In Edit Mode, delete all faces except for a 1/8 portion (half of a top-quarter slice).
  • Position it: Place this sphere piece exactly in the corner where your ramps end.

Mathematical compatibility is essential for vertices to snap perfectly. This is a "hidden" detail where many beginners get stuck:

  • If Mismatched: If the vertex counts on the ends of your objects don't match, do not try to force them together. The best solution is to delete the objects and recreate them from scratch with correct and equal numbers.
  • Creation Phase: When creating objects (Cylinder and UV Sphere), you must keep the main segment value (Vertices/Segments) the same for both parts.
  • Planning: For example, if you create a cylinder with 32 vertices to slice it into 1/4 (quarter), you should also create the sphere with 32 segments to slice it into 1/8.
  • 90-Degree Rule: Both the 1/4 cylinder and the 1/8 sphere actually cover a 90-degree arc. If you create both with the same base number (e.g., 32), exactly the same number of segments will fall into that 90-degree section for both, making the points align perfectly.

To ensure compatibility, you need to know how many segments your object has:

  • Step 1: Click the arrow next to the Viewport Overlays icon (two overlapping circles) in the top-right corner of the 3D Viewport.
  • Step 2: Check the Statistics box from the dropdown menu.
  • Tip: Statistics won't explicitly say "Segments." Select the edges on the curved part of your ramp; the number of selected edges (e.g., 8) is your segment count. Ensure this number matches for both the ramp and the sphere for a perfect fit.

Final touches to make it look like a single piece:

  • Merge: Select the entire object (A) and use M -> By Distance to merge overlapping points.
  • Shade Smooth: Right-click and choose Shade Smooth.
  • Auto Smooth: Go to Data Properties (green triangle) -> Normals -> **Auto Smooth** (or "Smooth by Angle" in Blender 5) and set it between 30-60 degrees.