Xform query: need frame specific results

[briand]

There is a -time option for getAttr....but there does not seem to be a -time option for xform ( in query mode ). Anyone have a workaround ? I need to get an object's absolute worldspace rot. at specific frames. This will be deployed within an expression. Need to get and store the values n frames ahead and behind current frame to compute a weighted average.

[glocker]

I use the API to do this, so I'm not positive about MEL, but wouldn't the currentTime commad work.

Use currentTime to set the frame time you want to evaluate and then make your xform calls

g-

[ccd]

Maybe there is another solution. As from the xform you can get the global and the object matrix. You can store the difference between then, and then you can use it with the setAttr -time ... to get the value for each time.

It's just an idea, I didn't check it, so please, let me know if it works.

Good luck,

David

[ccd]

Here is a few lines that must do something like this for a sphere with an animation under group with a traslation:

float $world[] = xform -q -a -ws -t nurbsSphere1;
float $objec[] = xform -q -a -os -t nurbsSphere1;
float $paren[];
$parent[0] = $world[0] - $objec[0]; $parent[1] = $world[1] - $objec[1]; $parent[2] = $world[2] - $objec[2];
float $valTi[] = getAttr -time 4 nurbsSphere1.translate;
float $resul[];
$resul[0] = $parent[0] + $valTi[0]; $resul[1] = $parent[1] + $valTi[1]; $resul[2] = $parent[2] + $valTi[2];
print $resul;

Hope this help,

David

[joojaa]

Are you saying you want to use x form in expressions... thatl kill your performance since there are no real connections.

However if you do this only once and keep the locations in your own memory storage then thats a whole other issue (also you can read the nim curves in as data too id bet)