For those who don’t know what retargeting is …

Here’s the demo of motion builder…

Motion capture retargetting paper:

**Outline of Retargetting Algorithm**

**Step 1:**

Begin with an initial motion with identified constraints.

These constraints can either come from:

- restrictions on the character, such as elbows do not bend backwards. the environment, such as nothing should be below the floor.

the motion, such as the character must pick up the box in frame 30.

Note: In this technique, they only dealt with equality constraints.**Step 2:**Find an initial estimate m1(t) of the solution.

- scale translational parameters. add translation to define the center of scaling.

**Step 3:** Choose a representation for the motion-displacement curve.

- represent the motion-displacement as cubic B-splines with uniformly spaced control points.

**Step 4:**

- Solve the non-linear constraint problem for a displacement that when added to step(2) provides motion that satisfies the constraints.

Final Form of the equation:

minimize 0.5 * xT * x subject to f(x) = C,

where f is a function of x, the control points, and

C is a column vector of size equal to the total number of constraints.Solve the above equation iteratively using a Sequential Quadratic Programming (SQP) solver.

http://davis.wpi.edu/~matt/courses/retarget/

Hope somebody with enough programming knowledge would take the initiative…,