After Extruding a Cylinder on a Curve How Do You Make It a Seperate Object Again

Issues Capping Objects

Caption of common capping failures and suggestions for fixing them

A common question on the Rhino newsgroup is "Why didn't my solid extrusion get airtight?" or "Why can't I cap this object?"

In the case of the Extrude command, Rhino currently doesn't give any error messages or explanations of why the control didn't work as expected. It just fails silently, leaving the inexperienced user to wonder what they did wrong.

In the case of the Cap command, y'all get a bulletin unable to cap that object, which isn't very helpful to diagnose the problem. Hopefully the explanations and procedures on this page will help…

Extrusions that won't cap...

Check for bad objects starting time

The post-obit is based on having valid objects. So, before you start, use SelBadObjects and make sure your objects are expert (they shouldn't select). If at that place are bad objects, yous need to gear up them first. For more info on dealing with bad objects, run across hither.

OK, my objects are good. What'due south wrong then?

Rhino needs to have a closed, planar curve to create a cap surface. If an extrusion of a theoretically airtight planar curve doesn't cap, even though you chose Extrude from the solid menu or clicked cap=yep in the command line, there are one of two things incorrect…

Either:

ane) the bend being used isn't closed, or
2) it isn't really planar.

Not closed

If there is no airtight loop, Rhinoceros cannot create a complete trim curve to create the cap surfaces. The object will extrude, but since the Rhino can't detect a complete airtight curve to trim the cap surface, it won't be created, and you lot volition be left with an open up extrusion. In Rhino iv, at that place is no error message given in this case.

How to notice out if your curve is open? Several ways:

• Utilise the command SelOpenCrv and see if it selects.

• Utilise the command SelClosedCrv and run into if it doesn't select.

• Select the curve and await in Backdrop>Details (or employ the command What). It should tell you if it'due south closed.

There are many methods to close an open curve, depending on what the problem is…

First, you lot need to find the open spot:

The commands CrvStart or CrvEnd will place a point at the first or finish of the curve, which is where the opening will exist found.

Y'all may so plow on points and try moving ane endpoint on top of the other with point snap or otherwise edit the object to shut it.

Not planar

If yous determine the curve is really closed (it didn't select with SelOpenCrv, or did select with SelClosedCrv, or Properties states it'southward closed), and it even so won't cap, then it is virtually certain information technology isn't planar. Information technology only needs to be microscopically off to make this command fail.

How to fix this case

You tin use Project to CPlane or SetPts and fix the curve to notwithstanding level. If after that your extrusion caps, that was your problem.

Important notation

Sometimes curves can be both open and non planar…
So you may need to fix both problems!

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Existing objects that won't cap

A parallel to an extrusion not capping is an existing open polysurface that you recall should cap just doesn't.

In that case, the opening to be capped should be considered in the same style every bit the curve that yous wanted to extrude in the first case. That is, the loop that defines it is either open up or not planar.

It may be open up if the polysurface isn't fully joined. Y'all can plough on naked edges to see if there are other naked edges besides the open edges to be capped.

Or, the opening you lot think is planar actually isn't.

Both of these cases will require a little more extensive repairs than a simple bend.

• In the starting time case, you need to fix the surfaces so that they join upwardly without any naked edges, except for the opening(south) you want to cap.

• In the 2nd, you lot need to detect where the loop is not planar and fix the offending surfaces so they do form a planar loop when joined.

Promise this small explanation makes someone's life a scrap easier…

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Source: https://wiki.mcneel.com/rhino/capproblems

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