Explicit modeling software: Explicit, geometry-based 3D CAD (Freeware), Detects and removes explicit adult material, Terrain modeling plug-in for Rhinoceros and more.
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With this AutoCAD add-on you can create mathematical curves. Curves can be defined as explicit, parametric or polar functions. Function's formula can also be changed dynamically by changing parameter 'p' value(parametric modeling). Use standard AutoCAD commands(revolve, extrude, ...) to create solids and surfaces from these mathematical functions.
