Create a subdivision object from a mesh
Use the Subdiv Reform tool to quickly generate complex subdivision models from mesh objects.
The Reform tool uses a multi-step process to generate the subdivision model. Inputs for each step are controlled using the tool parameters, such as Reduce to %. The steps are performed in order from top (Reduce to %) to bottom (Curvature Bias) with each relying on the output of the previous step. Therefore, if you make changes to Reduce to %, the final results typically take longer to compute as all steps need to be re-executed.
Before using the tool to generate a subdivision model, investigate the source mesh for obvious irregularities in the topology. In particular, be aware of the following:
- Unwanted holes in the mesh
- Non-uniform boundary edges or edges with sharp features
- Folded edges or self-intersecting triangles.
Consider using the Mesh Repair tool ( Mesh > Mesh Repair) or other Mesh Cleanup tools in Alias to analyze, and then repair irregularities in the source mesh. Starting with a mesh that does not have holes or jagged edges results in a more uniform subdivision model. For more information, see Repair defects in meshes and Clean up and repair meshes.
In the Mesh Repair Control window, make sure that Check self-intersecting triangles and Check folded edges are turned on under Stereolithography Validation Checks.
In the Subdivision tool palette, select the Reform tool
, and click
to open the control window.
Tip:Use the tool's default values to generate the first version of the subdivision object, and then adjust the Refinement parameter values until you achieve the desired results. If you don't achieve acceptable results, adjust Target Face Number.
Select the source mesh, and then click Build or press the Spacebar.
In the control window, adjust a tool parameter and click Update or press the Spacebar to rebuild the subdivision model.
To further refine the model, such as by adding or removing edges, click Edit in Retopo.
The Retopo tool opens and the mesh is selected as the target object so you can begin editing right away.
Related Tasks
- Refine subdivision surfaces using the Retopology tool
- Create and retopologize geometry using the Retopology tool