Hi guys.

I am trying to learn C4d and it’s going pretty well, but there are some concepts I can’t understand.

For example - is it possible to delete polygons and leave the edges?

Is it possible to extrude only edges without creating polygons?

Or is it possible to convert spline to mesh without filling it?

I can extrude individual vertices but I don’t know how to connect them.

Please, help!

# Does lonely edges exist in C4D?

**b-a-t**#1

**Cairyn**#2

In C4D, an object contains (1) **points**, made from three coordinates (not containing rotational or scale values per point), and (2) **polygons**, made from three or four points, and (3) **Ngons**, made from several polygons.

Edges do *not exist* in the data model. Edges can only be expressed indirectly through polygons and points (which is what the Edge Mode in C4D does), or through a **spline** which is a different data type however.

Thus, no, you cannot delete a polygon and leave the edges (but you can leave the points).

And no, you cannot extrude an edge to get only a lone edge; if you extrude an edge you will always get a polygon.

And no, you cannot convert a spline to an edge sequence with no polygons.

You can change an edge sequence into a spline though.

I’m not sure what you mean by “extrude individual vertices”. If I do that, C4D subdivides the bordering polygons and creates a polygon pyramid to the extruded point, so that point is actually connected by polys.

**b-a-t**#3

Thank you kind sir for your accurate explanation.

By extruding vertices, I meant duplicating them by crtl+drag. Sorry for the misused nomenclature.

I guess I will just have to get used to it then

I wanted to create a “swoosh” behind the car wiper.

I created a spline, made it a child of the wiper, and used a tracer object to leave a trail.

It resulted in a bunch of splines which I then converted into a single spline object.

Then I wanted to create a surface out of it with no luck. So I thought I would just convert it to mesh and bridge every edge. But I couldn’t do that either.

So in the end I extruded the spline, bridged the edges I wanted to keep, and deleted the extruded edges.

It seems like a foolish, and inefficient way to do it but I was not able to come up with any other solution

Here is the result:

Could you advise me to do it in a more elegant manner?