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Part and surface modeling
Develop feature-based parts and use surface tools where shape control requires a more flexible construction method.
zCAD. Online supports feature-based solid modeling together with surface workflows for mechanical and product design.
Build feature-based parts
Start with the features that establish the main volume and interfaces. Add secondary details after the controlling shape is stable, and keep references understandable so later edits remain predictable.
Use surfaces intentionally
Use surface construction when boundary control, transitions, or freeform shape development cannot be expressed efficiently as a direct solid feature. Inspect continuity and close the surface set before converting it into the required solid result.