Model preparation
CAD Simplification
Plan CAD model simplification around the geometry, detail and accuracy needed for visualization, simulation and data exchange.
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Prepare CAD models for their next use
CAD simplification reduces model complexity according to the information needed downstream. A visualization model, a simulation input and an exchange deliverable can require different levels of detail. Start with that requirement before deciding what geometry may change.
For an OCCT-based application, the useful question is which details can be removed or represented more simply while retaining the shape, interfaces and attributes needed by the next operation.
Define the simplification task
| Workflow | Evaluation criteria |
|---|---|
| Visualization | Loading time, memory use, visible detail and assembly structure |
| Simulation preparation | Geometry required by the analysis, boundary conditions and mesh preparation |
| Data exchange | Target format, shape validity, required attributes and receiving-system compatibility |
| Sharing engineering models | Details that may be omitted and information that must remain |
Discuss the actual feature types and acceptance criteria with the engineering team. Hole removal, fillet removal and other defeaturing operations should be evaluated against representative models rather than assumed from a general simplification requirement.
Choose the appropriate geometry operation
Simplifying a CAD boundary representation and reducing a display mesh solve different problems. Use Express Mesh when the requirement is control of surface discretization. Consider Canonical Recognition when analytic curves or surfaces can replace NURBS representations within a specified tolerance.
For a closed mesh around imperfect tessellation, see Surface Wrapping. For a CAD translator, compare the data exchange components. Combining these operations requires an application-specific sequence and validation.
Evaluate a CAD simplification workflow
Describe the input format, model size, detail to simplify and target workflow. Agree on checks such as shape validity, geometric deviation, retained interfaces, output size and processing time. Verify the result in the receiving application as well as in the preparation tool.
Discuss CAD simplification to establish the applicable component capabilities and integration scope. For an existing product, custom development services can help scope model preparation and validation.