DWG NO. MESH-TO-NURBS- DATE 2025-07 PORTFOLIO

Organic Mesh to NURBS: Rebuilding a Shape for Injection Moulding

A polygonal mesh rebuilt as a clean, watertight NURBS solid with draft, parting line and undercuts resolved — the conversion that stands between a concept and a mould.

Poligon mesh modelin, eğim açısı, ayırma çizgisi ve geri kalma sorunları çözülerek temiz ve su geçirmez NURBS katıya dönüştürülmesi — konsept ile kalıp arasındaki adım.

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The client had the shape they wanted. What they did not have was a shape a mould maker could accept.

The problem

A polygonal mesh and a manufacturing solid are different things:

• A mesh is faceted. Scaled up to a moulded part, facet edges become visible defects on a glossy surface.
• Meshes are rarely watertight, and a mould tool cannot be cut from geometry with holes in it.
• None of the moulding requirements exist in the mesh. Draft angles, parting line, undercuts — the mesh has no opinion about any of them, and all three decide whether the part can leave the tool.
• The shape still has to match. Rebuilding it is not licence to redesign it; the client’s form had to survive the process.

The approach

• Rebuild rather than convert. Automatic mesh-to-solid conversion carries the faceting through. The surfaces were reconstructed as continuous NURBS matching the original form.
• Parting line chosen before surfacing, because where the tool splits determines which surfaces need draft and in which direction.
• Draft applied as part of the geometry, not added afterwards as a fix, keeping the visible form consistent as it tapers.
• Undercuts removed or acknowledged. Anything that would need a side action was resolved in geometry or flagged so the tooling cost was a decision rather than a surprise.
• Delivered watertight, as a STEP file that opens cleanly in the mould maker’s CAM.

The result

A fully editable NURBS model and a high-precision STEP file matching the original organic shape, developed through two iterations.

Where this applies

Any product that starts life as a sculpt, a scan or an artist’s mesh and has to end up in a steel tool. This conversion is where most concept models stall.

I convert scans and meshes into manufacturable NURBS models with tooling constraints resolved. Request a quote or see all services.

reverse engineering mesh to NURBS conversion STEP file for tooling injection molding design draft angle analysis parting line design surface modeling DFM