Barrier¶

- const Barrier &barrier() const
- double barrier(const double d, const double dhat)

Adaptive Barrier Stiffness¶

double ipc::initial_barrier_stiffness(const double bbox_diagonal,
    const Barrier& barrier, const double dhat,
    const double average_mass, const Eigen::VectorXd& grad_energy,
    const Eigen::VectorXd& grad_barrier,
    double& max_barrier_stiffness,
    const double min_barrier_stiffness_scale = 1e11,
    const double dmin = 0)¶

Compute an inital barrier stiffness using the barrier potential gradient.

Parameters:¶

const double bbox_diagonal¶

[in] Length of the diagonal of the bounding box of the scene.

const Barrier &barrier¶

[in] Barrier function.

const double dhat¶

[in] Activation distance of the barrier.

const double average_mass¶

[in] Average mass of all bodies.

const Eigen::VectorXd &grad_energy¶

[in] Gradient of the elasticity energy function.

const Eigen::VectorXd &grad_barrier¶

[in] Gradient of the barrier potential.

double &max_barrier_stiffness¶

[out] Maximum stiffness of the barrier.

const double min_barrier_stiffness_scale = 1e11¶

[in] Scale used to premultiply the minimum barrier stiffness.

const double dmin = 0¶

[in] Minimum distance between elements.

Returns:¶

The initial barrier stiffness.

double ipc::update_barrier_stiffness(const double prev_min_distance,
    const double min_distance, const double max_barrier_stiffness,
    const double barrier_stiffness, const double bbox_diagonal,
    const double dhat_epsilon_scale = 1e-9, const double dmin = 0)¶

Update the barrier stiffness if the distance is decreasing and less than dhat_epsilon_scale * diag.

Parameters:¶

const double prev_min_distance¶

[in] Previous minimum distance between elements.

const double min_distance¶

[in] Current minimum distance between elements.

const double max_barrier_stiffness¶

[in] Maximum stiffness of the barrier.

const double barrier_stiffness¶

[in] Current barrier stiffness.

const double bbox_diagonal¶

[in] Length of the diagonal of the bounding box of the scene.

const double dhat_epsilon_scale = 1e-9¶

[in] Update if distance is less than this fraction of the diagonal.

const double dmin = 0¶

[in] Minimum distance between elements.

Returns:¶

The updated barrier stiffness.