Key locations in graph as vector data

[raschko]

For a bit now I have been taking key data in the graph editor, and interpreting them as vector points in order to angle tangents to the next key. With no real luck.

The issue is when trying to calculate the angle between keys.

As an example we have three points..

I am assuming that is how I shoud interpret these keys as vectors.

Using math for key 1 to 2:
vector $u = <>
vector $u = <>
float $angle = rad_to_deg(angle $u $v);

returns 75.9.....

Which is seemts to be off visually, if I use that value and phisically change the first keys tangent to that.

Or I am just crazy.

Any ideas?

Thank you.

[joojaa]

Which is seemts to be off visually, if I use that value and phisically change the first keys tangent to that.

Your graphs scale is not uniform, the grids are not square. See you can zoom the axes separately. So even if your calculation is right you wont see it, but only works  in the context of the scale of 1 unit of time = 1 unit of whatever is keyed. So thet would throw out the visual isnpection part.

vector $u = <>
vector $u = <>
float $angle = rad_to_deg(angle $u $v);

now that makes no sense whatsoever ist not evena proper calculation (at bere minimum it has a typo) but yes the right answer is:

-75.963759

Or I am just crazy.

Hard to say.

For a bit now I have been taking key data in the graph editor, and interpreting them as
vector points in order to angle tangents to the next key

Why would you do that? There is a ommand that does this calc for you know.

selectKey -add -k -t 1 nurbsSphere1_translateX ;
float $angleInternal[] = keyTangent -q -outAngle;

[raschko]

EH, been a bit clears throat

The idea was to create a tangent smoothing script.
I have used autotangent in the past but wanted something that would process more than just tangents.
As of right now, it smooths fine, with some minor issues and removes duplicate keys.

All that is left is linear key processing and overshoot.

Going off of above, the calculations have changed to tan^ instead of vectors.
opposite/adjacent

Which is easy enough: getting a degree from that uses atan( tan^ )*180.0/3.14159;

I took your advice and tried keyTangent -q -outAngle, but the default tangent angles didn't form a smooth curve.
Nice to know however, it will come in handy later!

Will keep things updated as they go.
Might upload it too once thigns are ironed out.

[joojaa]

yes but the thing is you can convert the tangent mode to a linear ine then undo or convert back to what it was, thatway you can ask the linear in btween and maya to calculates the answer it for you.

ut the default tangent angles didn't form a smooth curve.

maya has 6 possible defaults, you can change betweenn which do you refeer to.

[raschko]

you can convert the tangent mode to a linear ine then undo or convert back to what it was, thatway you can ask the linear >> in btween and maya to calculates the answer it for you.

Hmm.. I've actually done the linear thing before in creating tweened keys between stepped; but never thought of using it for this!

lol

it's so simple, might chop off a good 40 lines ish'

types away

maya has 6 possible defaults, you can change betweenn which do you refeer to.

I work from stepped to linear to spline. In some instances from stepped to spline thigns get garbled'
an opinion any way.

Let's see how this works!

[joojaa]

from stepped to spline thigns get garbled'

thats because you probably want to use Plateaou tangents instead of spline tangents

creating tweened keys

flash user?

it's so simple, might chop off a good 40 lines ish'

Best scripters are lazy they dont ahve to be better because you can mostly do in one line what others do in 2000, seriously. A heroic programmer is one that writes 2000 of those lines.