Re: tangent computation in .fraw / .fraw2 ?

[javier <javier.vdp(at)gmail.com>]

Fraw and fraw2 simply store the tangents. Tangent syntax requires 4 values per key (left length, left height, right length, right height). Added tangent lengths on 2 successive keys cannot be more than approx 1.25 of the distance between 2 keys and when you add a key on an editor that is ensured by the software.
 But thats too simple, you must want something else.

You want to create tangents from raw key data? The only way you can do that is doing some recursive fitting algorithm.

Im not sure what you are after but making fcurves from frequency sounds cool.

On 6/26/07, Alexander Hemery <vortex(at)fhw.gr> wrote:

nope..but thanks

----- Original Message -----

From: Wayne Williams

To: XSI(at)Softimage.COM

Sent: Tuesday, June 26, 2007 5:22 PM

Subject: Re: tangent computation in .fraw / .fraw2 ?

http://www.motionblur.it/docs.htm#xsiamp

Does the do what you are looking for?

----- Original Message -----

From: Alexander Hemery

To: XSI(at)Softimage.COM

Sent: Tuesday, June 26, 2007 9:47 AM

Subject: tangent computation in .fraw / .fraw2 ?

Hello,

 

Anyone know how those tangent values in .fraw/.fraw2 files are computed ?

We're doing a little application to get fcurves from sound ..by using a selected frequency (not global amplitude) ...but i can't understand what those tangent numbers derive from ... Any ideas?

 

There's always the option of exporting linear keys ...but what would be nice is to get a nice bezier with as few keys as possible....

 

Cheers

 

--

Alexander Hemery