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[RedKnight]

Currently working with 3d model animation(milkshape)
And I would like to store the joint keyframe's translation and Rotation into one Matrix

So I wonder if it is possible to interpolate (or linear interpolation) with matrices?

 

[ThemsAllTook]

It'd be possible, but it's probably easier to store joint data as a vector and a quaternion, and interpolate those instead. Doing a simple linear interpolation on each field of the matrix isn't likely to give you the results you want. You might end up getting a quaternion out of each matrix's rotation components, interpolating those, and turning them back into a matrix anyway, so storing a quaternion per joint would actually save you a step.

[zacaj]

Interpolating a transformation matrix will make the vertices move straight between the two matrices (no rotation).  Worked this out on paper when I was like 12

[RedKnight]

oooooooh ok.
thanks.
but at least I think I can store the rotations as Quaternions.

[zacaj]

yeah, just store a Quaternion and a XYZ position, much easier to interpolate