Deformable Model Pseudo-Code:

Initialize α1, α2, α3, and α4.

Begin A: Model Evolution.

Begin B: External Force Update.

Step 1: Update fu and fv;

Step 2: Update u and v using u′ = u + fu·Timestep, v′ = v + fv·Timestep

End B

Update m as $m^{\prime }=\sqrt{{u^{\prime }}^2+{v^{\prime }}^2}$

Begin C: Internal Feedback.

Step 1: Compute internal force fint = −Km′

Step 2: Decompose fint into $u_{int}=f_{int}\frac{u^{\prime }}{m^{\prime }}$ and $v_{int}=f_{int}\frac{v^{\prime }}{m^{\prime }}$

Step 3: Update u and v using u = u′+uint, v = v′+vint

End C

Evaluate the change of u and v. If small End A

End A