Convert to Implicit Geometry

Convert parts to implicit geometry. You can select CAD, PolyNURBS, meshes, or optimized parts.

The output is a Signed Distance Field (SDF) for the converted geometry, with negative scalar values inside the object and positive scalar values outside the object (the surface exists at positions with scalar values of zero).
The process begins with a BRep (NURBS), subdivision, or tessellated surface mesh (e.g., STL) geometry such as the BRep crank model shown below.

Based on the Visualization Quality setting that is active in the Implicit Modeling ribbon, the converted object will be less or more accurate and sharp. The next image shows the result of the conversion using the Medium Visualization Quality setting. This model will compute very quickly, but note the rounded edges and loss of sharp features in general.

To produce a more accurate Implicit reproduction of the original BRep model, the following image was created using the Very High Visualization Quality setting. Note the marked improvement in the sharpness of features, such as edges. This quality comes at the cost of a longer compute time, and a general increase in memory allocation to manipulate this object. It is recommended that users select a Visualization Quality that balances the trade-off between visual quality and compute time on their machine. You can always design at a lower Visualization quality and then increase this value periodically to check the appearance at higher quality settings.

This final image shows the converted implicit model overlaid on a sectioned view of its Signed Distance Field (SDF).

Note: For a much more detailed discussion around handling quality when converting into and out of Implicit Modeling, please consult the dedicated Visualization Quality and Mesh Settings page.
  1. On the Implicit Modeling ribbon, select the Convert tool.

  2. Optional: For Visualization Quality, select from Low to Very High quality, which corresponds to a low to very high density of elements. A higher quality produces sharper geometry features but is more computationally intensive. When creating a complicated function, it’s recommended to work using a lower quality and then switch to a higher quality after the function is complete.
  3. Select one or more parts to convert to implicit bodies.
    Note: Convertible formats include BRep (e.g., Parasolid, STEP, etc.), PolyNURBS (subdivision surfaces), and polymesh (tessellated surface meshes including .stl, .obj, .3mf, etc.). It is also possible to convert the geometry results arising from simulation and optimization workflows, such as topology optimization results.
  4. Click OK.