geometry pattern & feature pattern

[cprakash]

Hi,

I've observed a difference in geometry pattern & feature pattern.

I've just migrated to Creo Prametric 2.0 from Pro E 3.0

While pattering a geometry - under the numbers box.

If I write the no. = 2, well it creates 2 geometry

If I write the no. =3, it creates 4 geometry

I want to understand the logic behind it.

Where as in the feature pattern-

If I write the no. = 2, well it creates 2 features

If I write the no. =3, it creates 3 features.

please Help!

Thanks!

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[TomD.inPDX]

Mine is not behaving this way... Creo 2.0 M040

[cprakash]

I've also using M040

I've attached a ppt. shwoing the steps How it comes?

Please refer .

Thankyou for the reply.

[neomechanikos]

That definitely looks like a bug. I had the same results using your method in the powerpoint; I'm on Creo 2.0 M70. I tried the following similar methods:

• Method 1: Geom pattern the solid surfaces = bug
• Method 2: Copy of the surfaces then geom pattern the copy = OK
• Method 3: Select one surface then geom pattern, then use the references dialog to select more surfaces = OK
• Method 4: Use ALT+CTL and select all surfaces individually then geom pattern = OK

[Inoram]

M090 behaves the same. Kind of weird though, the copy is adding the previous copies.

Antonius, no m090 yet?!?!?

[dschenken]

When this comes up in a code review it is called "off-by-one"

The usual causes:

Increment from zero for one case and increment from one for another

-or-

Stop at equals to limit or stop at exceeds limit.

Better put - do you count the pickets in the fence or do you count the gaps.

[neomechanikos]

Actually, if you:

Pattern 2, you get 2

Pattern 3, you get 4

Pattern 4, you get 7

Pattern 5, you get 11

I think I see what might be going on. It selects all solid geometry for each instance of the pattern. You can see this if you have prehighlight on and hover over each instance of the pattern. So this may be typical programed Creo (mis)behavior after all?

[dschenken]

Fiendishly clever. Practically diabolical.

nth term is (n-1) + term(n-1)

1=>1

2=>2

3=>4

4=>7

5=>11

if correct, then 6 => 16.

Where's Vi Hart when we need her?

[TomD.inPDX]

Antonius, no m090 yet?!?!?

I go the disk

So who's going to report the bug?

[Inoram]

Antonius, tried to PM you as to not derail the thread, but it says your mailbox is full.

[TomD.inPDX]

Thanks... its empty now

[Kevin]

It's not just Creo 2, it happens with earlier versions also. I'll see if it happens in WF5 but my guess is it will be the same.

[Kevin]

If you turn off the solidify option on the Options tab on the Geometry References it copies the solid surfaces as you were expecting it to.