Py-ParametricTools is a very simple approach to parametric modeling. Based on an idea of my friend Noseman, Py-ParametricTools basically consist of a bunch of generator and modifier objects for a number of commonly used modeling tools. Nothing fancy and easily done in Python, we thought this could still be helpful for some users out there.

There are generators and modifiers for the following modeling tools:

  • Extrude
  • Extrude Inner
  • Normal Move
  • Normal Scale
  • Normal Rotate
  • Reverse Normals
  • Smooth Shift


The generators and modifiers are used like all the others in Cinema 4D. Generators get parented to objects and modifiers are used as children. The parameters are mainly the same as in the respective modeling tools.
For details see our online help here: Extrude, Extrude Inner, Normal Move, Normal Scale, Normal Rotate, Reverse Normals, Smooth Shift.

Of course generators can be stacked.

All modifiers support selections to restrict them to certain polygons, simply drag the selection tags onto the respective field inside a modifier’s parameters.

The Extrude generator (and only the Extrude generator) also supports two “implicit” selections: front and sides, the later only being available if “Create Caps” is not activated. In order to use these simply drag a material onto the Extrude generator and type either name into the Selection parameter of the Texture tag.


Look at the image “Modifiers restricted to selections” above, where a polygon cube gets deformed by three parametric modifiers, each restricted to a different selection. As long as they have the same polygon count, you could create the polygon selections on a polygonal cube and afterwards drag them to a parametric cube. In this way you have parametric polygon tools deforming only selected polygons of a parameteric cube.

One More Note

As said before, this project really is nothing fancy. But for some it may serve as an example, how easily Python can be used to create a parametric workflow for existing tools. It’s also demonstrating how to re-use existing description resources.


Simply unzip the downloaded archive into the plugins folder. There’s a palette file included, which can be simply dragged onto Cinema 4D.


Cinema 4D R16 and higher. May even work with lower versions, but was never tested.



Unzip the downloaded archive to Cinema 4D’s default plugin folder.


Provide your bug reports, test scenes or ideas by writing an email to labs-at-maxon-dot-net

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