I have created a function that adds points to a polygon.

But how to remove a point from a polygon, as well as remove the faces that contain it ?

# Remove points from a polygon

Hey @kantronin,

Thank you for reaching out to us. I would recommend having a look at the Modeling Python Examples. They are a bit hidden, but in the Geometry section I went over the general classic API geometry model of Cinema 4D.

Regarding your core questions:

- Removing points from a polygon: Without wanting to be overly pedantic, I must point out that polygons only index vertices, they do not hold them;
`CPolygon`

references with its fields`a`

,`b`

,`c`

, and`d`

the vertices of the`PolygonObject`

it is attached to. In this sense removing points from a polygon is not possible, you can just de-index them. Cinema 4D expresses both triangles and quadrangles with the type`CPolygon`

, i.e., as quadrangles. A triangle simply repeats its`c`

index in its`d`

index. I explained this in the modelling examples in more detail. - Removing vertices or polygons from a
`PolygonObject`

: There is neither a`PolygonObject.RemovePolygon`

nor a`PointObject.RemovePoint`

if that is what you are looking for. When you want to change the vertex or polygon count of a`PolygonObject`

, you must call`PolygonObject.ResizeObject`

and then call`PointObject.SetAllPoints()`

and for each (new) polygon`PolygonObject.SetPolygon`

. The operation_extrude_polygons_s26 example covers this subject, although I go there into the opposite direction, I increase the point and polygon count rather than decreasing it.

PS: Useful might also be geometry_polygonobject_s26 because I explained there the type from scratch.

Cheers,

Ferdinand

MAXON SDK Specialist

developers.maxon.net