# Wind Loop Period not as shown

## Recommended Posts

Hi All,

Has anyone else encountered a problem where the identified period of a loop is not the actual looping point? I have been scratching my head over this for a few days and gotten to the point where I think the stiffness value is having something done to it before it is fed into the equation. I have already worked back to the equation that generates the displayed period (which I then found in a forum post)..

Leaving other variables at 1 for simplicity, I'm finding that changing the stiffness value results in loops as below:

Stiffness         Period        Actual Period

0.5                  5                ~15 (give or take a few ticks)

1                     10              30

2                     20              ~32

3                     30              ~39

4                     40              50

5                     50              ~58

6                     60              ~68

And so on. I've found there is a decreasing value which approaches 1 as the stiffness value increases. But that's about where my ability to pull this apart ends. The difference factor I have found does plot a pretty neat curve [3, 1.6666, 1.3333, 1.25, 1.17, 1.141667], but I can't quite bring it into something I can use to predict the actual period.

If there's any suggestions out there, I'm all ears. (incidentally, GrowFX version: 1.9.9 sp2)

Kind Regards,

##### Share on other sites

Hi DSimmonds,

Please send me your scene file where you got these results...

Thanks!

##### Share on other sites

Hi Eduard,

Thanks for the reply. Please find attached a simple test scene. I've stripped it down to bare bones, but if you need it in another version/format, please let me know.

Kind Regards,

Daniel

WindLoop_GrowFX_TestScene.max

##### Share on other sites

Hi DSimmonds,

Yes, you're right, there is some inaccuracy. This is due to the fact that you've the System unit scale = 1 meter, and if you make your scene with System unit scale = 1 cm or 1 inches, then the problem will be solved.

Please see my example: WindLoop_GrowFX_TestScene_2.max

Of course, we'll try to solve this issue programmatically.

Thanks for your bug report!
##### Share on other sites

Thanks Eduard,

That has resolved that issue. On to looping some trees!

Regards,

Daniel

## Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

Only 75 emoji are allowed.

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.