waxmorph.emulator.mech_step_sticky_differentiable

waxmorph.emulator.mech_step_sticky_differentiable(tape, X, R, particle_count, dt, f_net, grid=None)

Record mechanics with frozen topology.

Pair discovery remains outside the tape; radii participate in recorded force arithmetic. Inactive position rows retain identity gradients. The caller seeds X_out.grad and replays tape.

Parameters:

• tape (Tape)

• X (array)

• R (array)

• particle_count (int)

• dt (float)

• f_net (array)

• grid (HashGrid | None)

Return type:

array