BIM Q&A: Key Repairs for JCAD Models When Importing from Rhino

BIM Q&A | What Are the Main Repair Steps for JCAD Models When Importing from Rhino? Here’s How to Fix Them

1. Sharp Edge Issues:
Facet or Boolean failures often result from sharp edges. Any surface with sharp edges can cause problems. To fix this:
Select the object (if it’s a polysurface, explode it first; if it’s a single surface, no need to explode) → Use the Remove Control Point tool → Select the sharp edge control points (if the direction is incorrect, press T to toggle direction) → Remove control points until the edge is rounded.
When the control point turns yellow, the edge is selected. Adjust directions as needed by pressing T until the edge is smooth and rounded.

2. Embedding Issue #1:
Sometimes exposed edges are too small to repair directly. To fix this:
Divide the surface using structural lines → Select the object to divide → Split the surface near the exposed edge (keep the divided area as small as possible) → Use the Embed Surface tool → Select the exposed edge and choose the Embed Surface option (see illustration).
If embedding fails, increase the values in the U and V fields equally (numbers must be the same).
After embedding, select the repaired faces and join them together.
If the division direction is wrong, press T to switch directions.

3. Embedding Issue #2:
When two models share a common face, each model needs to be joined with its own facet separately. This happens because Rhino cannot determine which face to combine.
The overlapping faces of two objects must be selected individually and then joined into separate closed polysurfaces.

4. Black Spot Issue:
Black areas on top of the model usually indicate duplicate points.
To fix this:
Select the model → Explode it → Use Remove Control Point tool to clear duplicate points → Apply the Embed (or Cap) tool → Join all surfaces.
If the object is a polysurface, explode it first; if it’s a surface, no explosion is needed.
After removing control points, select all surfaces and join them into a closed polysurface to eliminate the black spots.

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