[Algorithms] Keyframe data

[Dirk G. <di...@di...>]

Hi,

I have imported a skinned mesh out of a x-file into my application. The
keyframe data is split into three parts:

Vector3D Scale;
Vector3D Translation;
Quaternion Rotation;

Given an arbitrary time t. How do I interpolate the keyframe data? My guess
is to SLERP the rotation part and to LERP the scale and the translation
parts. Finally, how can create a matrix out of this information? Is it
simply converting the interpolated quaternion back to a matrix and then
inserting the interpolated translation?
For the scale part I have only a very unsure guess. Do I have to add the
interpolated scale value to the elemts of the trace of the matrix?

Or will this work:
Build a scale-, translation-, and rotaionmatrix out of the interpolated data
and then multiply the results? But in which order?

Hope this is not Off Topic!!

Kind regards

Dirk