Continuous Collision Detection¶

bool ipc::is_step_collision_free(const CollisionMesh& mesh,
    const Eigen::MatrixXd& vertices_t0,
    const Eigen::MatrixXd& vertices_t1,
    const double min_distance = 0.0,
    const BroadPhaseMethod broad_phase_method
    = DEFAULT_BROAD_PHASE_METHOD,
    const NarrowPhaseCCD& narrow_phase_ccd
    = DEFAULT_NARROW_PHASE_CCD)¶

Determine if the step is collision free.

Note

Assumes the trajectory is linear.

Parameters:¶

const CollisionMesh &mesh¶

The collision mesh.

const Eigen::MatrixXd &vertices_t0¶

Surface vertex vertices at start as rows of a matrix.

const Eigen::MatrixXd &vertices_t1¶

Surface vertex vertices at end as rows of a matrix.

const double min_distance = 0.0¶

The minimum distance allowable between any two elements.

const BroadPhaseMethod broad_phase_method = DEFAULT_BROAD_PHASE_METHOD¶

The broad phase method to use.

const NarrowPhaseCCD &narrow_phase_ccd = DEFAULT_NARROW_PHASE_CCD¶

The narrow phase CCD algorithm to use.

Returns:¶

True if any collisions occur.

double ipc::compute_collision_free_stepsize(
    const CollisionMesh& mesh, const Eigen::MatrixXd& vertices_t0,
    const Eigen::MatrixXd& vertices_t1,
    const double min_distance = 0.0,
    const BroadPhaseMethod broad_phase_method
    = DEFAULT_BROAD_PHASE_METHOD,
    const NarrowPhaseCCD& narrow_phase_ccd
    = DEFAULT_NARROW_PHASE_CCD)¶

Computes a maximal step size that is collision free.

Note

Assumes the trajectory is linear.

Parameters:¶

const CollisionMesh &mesh¶

The collision mesh.

const Eigen::MatrixXd &vertices_t0¶

Vertex vertices at start as rows of a matrix. Assumes vertices_t0 is intersection free.

const Eigen::MatrixXd &vertices_t1¶

Surface vertex vertices at end as rows of a matrix.

const double min_distance = 0.0¶

The minimum distance allowable between any two elements.

const BroadPhaseMethod broad_phase_method = DEFAULT_BROAD_PHASE_METHOD¶

The broad phase method to use.

const NarrowPhaseCCD &narrow_phase_ccd = DEFAULT_NARROW_PHASE_CCD¶

The narrow phase CCD algorithm to use.

Returns:¶

A step-size \(\in [0, 1]\) that is collision free. A value of 1.0 if a full step and 0.0 is no step.

Narrow Phase CCD¶

class NarrowPhaseCCD¶

Inheritence diagram for ipc::NarrowPhaseCCD:

Subclassed by ipc::AdditiveCCD, ipc::TightInclusionCCD

Public Functions

NarrowPhaseCCD() = default¶

virtual ~NarrowPhaseCCD() = default¶

virtual bool point_point_ccd(const VectorMax3d& p0_t0,
    const VectorMax3d& p1_t0, const VectorMax3d& p0_t1,
    const VectorMax3d& p1_t1, double& toi,
    const double min_distance = 0.0, const double tmax = 1.0) const
    = 0¶

virtual bool point_edge_ccd(const VectorMax3d& p_t0,
    const VectorMax3d& e0_t0, const VectorMax3d& e1_t0,
    const VectorMax3d& p_t1, const VectorMax3d& e0_t1,
    const VectorMax3d& e1_t1, double& toi,
    const double min_distance = 0.0, const double tmax = 1.0) const
    = 0¶

virtual bool point_triangle_ccd(const Eigen::Vector3d& p_t0,
    const Eigen::Vector3d& t0_t0, const Eigen::Vector3d& t1_t0,
    const Eigen::Vector3d& t2_t0, const Eigen::Vector3d& p_t1,
    const Eigen::Vector3d& t0_t1, const Eigen::Vector3d& t1_t1,
    const Eigen::Vector3d& t2_t1, double& toi,
    const double min_distance = 0.0, const double tmax = 1.0) const
    = 0¶

virtual bool edge_edge_ccd(const Eigen::Vector3d& ea0_t0,
    const Eigen::Vector3d& ea1_t0, const Eigen::Vector3d& eb0_t0,
    const Eigen::Vector3d& eb1_t0, const Eigen::Vector3d& ea0_t1,
    const Eigen::Vector3d& ea1_t1, const Eigen::Vector3d& eb0_t1,
    const Eigen::Vector3d& eb1_t1, double& toi,
    const double min_distance = 0.0, const double tmax = 1.0) const
    = 0¶

Tight Inclusion CCD¶

class TightInclusionCCD : public ipc::NarrowPhaseCCD¶

Inheritence diagram for ipc::TightInclusionCCD:

Collaboration diagram for ipc::TightInclusionCCD:

Public Functions

TightInclusionCCD(const double tolerance = DEFAULT_TOLERANCE,
    const long max_iterations = DEFAULT_MAX_ITERATIONS,
    const double conservative_rescaling
    = DEFAULT_CONSERVATIVE_RESCALING)¶

Construct a new AdditiveCCD object.

Parameters:¶

const double conservative_rescaling = DEFAULT_CONSERVATIVE_RESCALING¶

The conservative rescaling of the time of impact.

virtual bool point_point_ccd(const VectorMax3d& p0_t0,
    const VectorMax3d& p1_t0, const VectorMax3d& p0_t1,
    const VectorMax3d& p1_t1, double& toi,
    const double min_distance = 0.0,
    const double tmax = 1.0) const override¶

Computes the time of impact between two points using continuous collision detection.

Parameters:¶

const VectorMax3d &p0_t0¶

[in] The initial position of the first point.

const VectorMax3d &p1_t0¶

[in] The initial position of the second point.

const VectorMax3d &p0_t1¶

[in] The final position of the first point.

const VectorMax3d &p1_t1¶

[in] The final position of the second point.

double &toi¶

[out] The time of impact between the two points.

const double min_distance = 0.0¶

[in] The minimum distance between the points.

const double tmax = 1.0¶

[in] The maximum time to check for collisions.

Returns:¶

True if a collision was detected, false otherwise.

virtual bool point_edge_ccd(const VectorMax3d& p_t0,
    const VectorMax3d& e0_t0, const VectorMax3d& e1_t0,
    const VectorMax3d& p_t1, const VectorMax3d& e0_t1,
    const VectorMax3d& e1_t1, double& toi,
    const double min_distance = 0.0,
    const double tmax = 1.0) const override¶

Computes the time of impact between a point and an edge using continuous collision detection.

Parameters:¶

const VectorMax3d &p_t0¶

[in] The initial position of the point.

const VectorMax3d &e0_t0¶

[in] The initial position of the first endpoint of the edge.

const VectorMax3d &e1_t0¶

[in] The initial position of the second endpoint of the edge.

const VectorMax3d &p_t1¶

[in] The final position of the point.

const VectorMax3d &e0_t1¶

[in] The final position of the first endpoint of the edge.

const VectorMax3d &e1_t1¶

[in] The final position of the second endpoint of the edge.

double &toi¶

[out] The time of impact between the point and the edge.

const double min_distance = 0.0¶

[in] The minimum distance between the objects.

const double tmax = 1.0¶

[in] The maximum time to check for collisions.

Returns:¶

True if a collision was detected, false otherwise.

virtual bool edge_edge_ccd(const Eigen::Vector3d& ea0_t0,
    const Eigen::Vector3d& ea1_t0, const Eigen::Vector3d& eb0_t0,
    const Eigen::Vector3d& eb1_t0, const Eigen::Vector3d& ea0_t1,
    const Eigen::Vector3d& ea1_t1, const Eigen::Vector3d& eb0_t1,
    const Eigen::Vector3d& eb1_t1, double& toi,
    const double min_distance = 0.0,
    const double tmax = 1.0) const override¶

Computes the time of impact between two edges in 3D using continuous collision detection.

Parameters:¶

const Eigen::Vector3d &ea0_t0¶

[in] The initial position of the first endpoint of the first edge.

const Eigen::Vector3d &ea1_t0¶

[in] The initial position of the second endpoint of the first edge.

const Eigen::Vector3d &eb0_t0¶

[in] The initial position of the first endpoint of the second edge.

const Eigen::Vector3d &eb1_t0¶

[in] The initial position of the second endpoint of the second edge.

const Eigen::Vector3d &ea0_t1¶

[in] The final position of the first endpoint of the first edge.

const Eigen::Vector3d &ea1_t1¶

[in] The final position of the second endpoint of the first edge.

const Eigen::Vector3d &eb0_t1¶

[in] The final position of the first endpoint of the second edge.

const Eigen::Vector3d &eb1_t1¶

[in] The final position of the second endpoint of the second edge.

double &toi¶

[out] The time of impact between the two edges.

const double min_distance = 0.0¶

[in] The minimum distance between the objects.

const double tmax = 1.0¶

[in] The maximum time to check for collisions.

Returns:¶

True if a collision was detected, false otherwise.

virtual bool point_triangle_ccd(const Eigen::Vector3d& p_t0,
    const Eigen::Vector3d& t0_t0, const Eigen::Vector3d& t1_t0,
    const Eigen::Vector3d& t2_t0, const Eigen::Vector3d& p_t1,
    const Eigen::Vector3d& t0_t1, const Eigen::Vector3d& t1_t1,
    const Eigen::Vector3d& t2_t1, double& toi,
    const double min_distance = 0.0,
    const double tmax = 1.0) const override¶

Computes the time of impact between a point and a triangle in 3D using continuous collision detection.

Parameters:¶

const Eigen::Vector3d &p_t0¶

[in] The initial position of the point.

const Eigen::Vector3d &t0_t0¶

[in] The initial position of the first vertex of the triangle.

const Eigen::Vector3d &t1_t0¶

[in] The initial position of the second vertex of the triangle.

const Eigen::Vector3d &t2_t0¶

[in] The initial position of the third vertex of the triangle.

const Eigen::Vector3d &p_t1¶

[in] The final position of the point.

const Eigen::Vector3d &t0_t1¶

[in] The final position of the first vertex of the triangle.

const Eigen::Vector3d &t1_t1¶

[in] The final position of the second vertex of the triangle.

const Eigen::Vector3d &t2_t1¶

[in] The final position of the third vertex of the triangle.

double &toi¶

[out] The time of impact between the point and the triangle.

const double min_distance = 0.0¶

[in] The minimum distance between the objects.

const double tmax = 1.0¶

[in] The maximum time to check for collisions.

Returns:¶

True if a collision was detected, false otherwise.

Public Members

double tolerance¶

Solver tolerance.

long max_iterations¶

Maximum number of iterations.

double conservative_rescaling¶

Conservative rescaling of the time of impact.

Public Static Attributes

static constexpr double DEFAULT_TOLERANCE = 1e-6¶

The default tolerance used with Tight-Inclusion CCD.

static constexpr long DEFAULT_MAX_ITERATIONS = 10'000'000l¶

The default maximum number of iterations used with Tight-Inclusion CCD.

static constexpr double DEFAULT_CONSERVATIVE_RESCALING = 0.8¶

The default conservative rescaling value used to avoid taking steps exactly to impact.

static constexpr double SMALL_TOI = 1e-6¶

Tolerance for small time of impact which triggers rerunning CCD without a minimum separation.

Private Functions

bool point_point_ccd_3D(const Eigen::Vector3d& p0_t0,
    const Eigen::Vector3d& p1_t0, const Eigen::Vector3d& p0_t1,
    const Eigen::Vector3d& p1_t1, double& toi,
    const double min_distance = 0.0, const double tmax = 1.0) const¶

Computes the time of impact between two points in 3D using continuous collision detection.

Parameters:¶

const Eigen::Vector3d &p0_t0¶

[in] The initial position of the first point.

const Eigen::Vector3d &p1_t0¶

[in] The initial position of the second point.

const Eigen::Vector3d &p0_t1¶

[in] The final position of the first point.

const Eigen::Vector3d &p1_t1¶

[in] The final position of the second point.

double &toi¶

[out] The time of impact between the two points.

const double min_distance = 0.0¶

[in] The minimum distance between the objects.

const double tmax = 1.0¶

[in] The maximum time to check for collisions.

Returns:¶

True if a collision was detected, false otherwise.

bool point_edge_ccd_3D(const Eigen::Vector3d& p_t0,
    const Eigen::Vector3d& e0_t0, const Eigen::Vector3d& e1_t0,
    const Eigen::Vector3d& p_t1, const Eigen::Vector3d& e0_t1,
    const Eigen::Vector3d& e1_t1, double& toi,
    const double min_distance = 0.0, const double tmax = 1.0) const¶

Computes the time of impact between a point and an edge in 3D using continuous collision detection.

Parameters:¶

const Eigen::Vector3d &p_t0¶

[in] The initial position of the point.

const Eigen::Vector3d &e0_t0¶

[in] The initial position of the first endpoint of the edge.

const Eigen::Vector3d &e1_t0¶

[in] The initial position of the second endpoint of the edge.

const Eigen::Vector3d &p_t1¶

[in] The final position of the point.

const Eigen::Vector3d &e0_t1¶

[in] The final position of the first endpoint of the edge.

const Eigen::Vector3d &e1_t1¶

[in] The final position of the second endpoint of the edge.

double &toi¶

[out] The time of impact between the point and the edge.

const double min_distance = 0.0¶

[in] The minimum distance between the objects.

const double tmax = 1.0¶

[in] The maximum time to check for collisions.

Returns:¶

True if a collision was detected, false otherwise.

Private Static Functions

static bool ccd_strategy(
    const std::function<bool(double, bool, double&)>& ccd,
    const double min_distance, const double initial_distance,
    const double conservative_rescaling, double& toi)¶

Perform the CCD strategy outlined by Li et al.

[2020].

Parameters:¶

const std::function<bool(double, bool, double&)> &ccd¶

[in] The continuous collision detection function.

const double min_distance¶

[in] The minimum distance between the objects.

const double initial_distance¶

[in] The initial distance between the objects.

const double conservative_rescaling¶

[in] The conservative rescaling of the time of impact.

double &toi¶

[out] Output time of impact.

Returns:¶

True if a collision was detected, false otherwise.

Additive CCD¶

class AdditiveCCD : public ipc::NarrowPhaseCCD¶

Inheritence diagram for ipc::AdditiveCCD:

Collaboration diagram for ipc::AdditiveCCD:

Additive Continuous Collision Detection (CCD) from [Li et al. 2021].

Public Functions

AdditiveCCD(const long max_iterations = UNLIMITTED_ITERATIONS,
    const double conservative_rescaling
    = DEFAULT_CONSERVATIVE_RESCALING)¶

Construct a new AdditiveCCD object.

Parameters:¶

const double conservative_rescaling = DEFAULT_CONSERVATIVE_RESCALING¶

The conservative rescaling of the time of impact.

virtual bool point_point_ccd(const VectorMax3d& p0_t0,
    const VectorMax3d& p1_t0, const VectorMax3d& p0_t1,
    const VectorMax3d& p1_t1, double& toi,
    const double min_distance = 0.0,
    const double tmax = 1.0) const override¶

Computes the time of impact between two points using continuous collision detection.

Parameters:¶

const VectorMax3d &p0_t0¶

The initial position of the first point.

const VectorMax3d &p1_t0¶

The initial position of the second point.

const VectorMax3d &p0_t1¶

The final position of the first point.

const VectorMax3d &p1_t1¶

The final position of the second point.

double &toi¶

[out] The time of impact between the two points.

const double min_distance = 0.0¶

The minimum distance between two objects.

const double tmax = 1.0¶

The maximum time to check for collisions.

conservative_rescaling

The conservative rescaling of the time of impact.

Returns:¶

True if a collision was detected, false otherwise.

virtual bool point_edge_ccd(const VectorMax3d& p_t0,
    const VectorMax3d& e0_t0, const VectorMax3d& e1_t0,
    const VectorMax3d& p_t1, const VectorMax3d& e0_t1,
    const VectorMax3d& e1_t1, double& toi,
    const double min_distance = 0.0,
    const double tmax = 1.0) const override¶

Computes the time of impact between a point and an edge using continuous collision detection.

Parameters:¶

const VectorMax3d &p_t0¶

The initial position of the point.

const VectorMax3d &e0_t0¶

The initial position of the first endpoint of the edge.

const VectorMax3d &e1_t0¶

The initial position of the second endpoint of the edge.

const VectorMax3d &p_t1¶

The final position of the point.

const VectorMax3d &e0_t1¶

The final position of the first endpoint of the edge.

const VectorMax3d &e1_t1¶

The final position of the second endpoint of the edge.

double &toi¶

[out] The time of impact between the point and the edge.

const double min_distance = 0.0¶

The minimum distance between two objects.

const double tmax = 1.0¶

The maximum time to check for collisions.

conservative_rescaling

The conservative rescaling of the time of impact.

Returns:¶

True if a collision was detected, false otherwise.

virtual bool point_triangle_ccd(const Eigen::Vector3d& p_t0,
    const Eigen::Vector3d& t0_t0, const Eigen::Vector3d& t1_t0,
    const Eigen::Vector3d& t2_t0, const Eigen::Vector3d& p_t1,
    const Eigen::Vector3d& t0_t1, const Eigen::Vector3d& t1_t1,
    const Eigen::Vector3d& t2_t1, double& toi,
    const double min_distance = 0.0,
    const double tmax = 1.0) const override¶

Computes the time of impact between a point and a triangle using continuous collision detection.

Parameters:¶

const Eigen::Vector3d &p_t0¶

The initial position of the point.

const Eigen::Vector3d &t0_t0¶

The initial position of the first vertex of the triangle.

const Eigen::Vector3d &t1_t0¶

The initial position of the second vertex of the triangle.

const Eigen::Vector3d &t2_t0¶

The initial position of the third vertex of the triangle.

const Eigen::Vector3d &p_t1¶

The final position of the point.

const Eigen::Vector3d &t0_t1¶

The final position of the first vertex of the triangle.

const Eigen::Vector3d &t1_t1¶

The final position of the second vertex of the triangle.

const Eigen::Vector3d &t2_t1¶

The final position of the third vertex of the triangle.

double &toi¶

[out] The time of impact between the point and the triangle.

const double min_distance = 0.0¶

The minimum distance between two objects.

const double tmax = 1.0¶

The maximum time to check for collisions.

conservative_rescaling

The conservative rescaling of the time of impact.

Returns:¶

True if a collision was detected, false otherwise.

virtual bool edge_edge_ccd(const Eigen::Vector3d& ea0_t0,
    const Eigen::Vector3d& ea1_t0, const Eigen::Vector3d& eb0_t0,
    const Eigen::Vector3d& eb1_t0, const Eigen::Vector3d& ea0_t1,
    const Eigen::Vector3d& ea1_t1, const Eigen::Vector3d& eb0_t1,
    const Eigen::Vector3d& eb1_t1, double& toi,
    const double min_distance = 0.0,
    const double tmax = 1.0) const override¶

Computes the time of impact between two edges using continuous collision detection.

Parameters:¶

const Eigen::Vector3d &ea0_t0¶

The initial position of the first endpoint of the first edge.

const Eigen::Vector3d &ea1_t0¶

The initial position of the second endpoint of the first edge.

const Eigen::Vector3d &eb0_t0¶

The initial position of the first endpoint of the second edge.

const Eigen::Vector3d &eb1_t0¶

The initial position of the second endpoint of the second edge.

const Eigen::Vector3d &ea0_t1¶

The final position of the first endpoint of the first edge.

const Eigen::Vector3d &ea1_t1¶

The final position of the second endpoint of the first edge.

const Eigen::Vector3d &eb0_t1¶

The final position of the first endpoint of the second edge.

const Eigen::Vector3d &eb1_t1¶

The final position of the second endpoint of the second edge.

double &toi¶

[out] The time of impact between the two edges.

const double min_distance = 0.0¶

The minimum distance between two objects.

const double tmax = 1.0¶

The maximum time to check for collisions.

conservative_rescaling

The conservative rescaling of the time of impact.

Returns:¶

True if a collision was detected, false otherwise.

Public Members

long max_iterations¶

Maximum number of iterations.

double conservative_rescaling¶

The conservative rescaling value used to avoid taking steps exactly to impact.

Public Static Attributes

static constexpr long DEFAULT_MAX_ITERATIONS = 10'000'000l¶

The default maximum number of iterations used with Tight-Inclusion CCD.

static constexpr long UNLIMITTED_ITERATIONS = -1¶

Unlimitted number of iterations.

static constexpr double DEFAULT_CONSERVATIVE_RESCALING = 0.9¶

The default conservative rescaling value used to avoid taking steps exactly to impact.

Value choosen to based on [Li et al. 2021].

Private Functions

bool additive_ccd(VectorMax12d x, const VectorMax12d& dx,
    const std::function<double(const VectorMax12d&)>&
        distance_squared,
    const double max_disp_mag, double& toi,
    const double min_distance = 0.0, const double tmax = 1.0) const¶

Computes the time of impact between two objects using additive continuous collision detection.

Parameters:¶

const std::function<double(const VectorMax12d&)> &distance_squared¶

A function that computes the squared distance between the two objects at a given time.

double &toi¶

[out] The time of impact between the two objects.

const double min_distance = 0.0¶

The minimum distance between the objects.

const double tmax = 1.0¶

The maximum time to check for collisions.

conservative_rescaling

The amount to rescale the objects by to ensure conservative advancement.

Returns:¶

True if a collision was detected, false otherwise.

Inexact CCD¶

bool ipc::inexact_point_edge_ccd_2D(const Eigen::Vector2d& p_t0,
    const Eigen::Vector2d& e0_t0, const Eigen::Vector2d& e1_t0,
    const Eigen::Vector2d& p_t1, const Eigen::Vector2d& e0_t1,
    const Eigen::Vector2d& e1_t1, double& toi,
    const double conservative_rescaling)¶

Inexact continuous collision detection between a point and an edge in 2D.

Parameters:¶

const Eigen::Vector2d &p_t0¶

[in] The initial position of the point.

const Eigen::Vector2d &e0_t0¶

[in] The initial position of the first endpoint of the edge.

const Eigen::Vector2d &e1_t0¶

[in] The initial position of the second endpoint of the edge.

const Eigen::Vector2d &p_t1¶

[in] The final position of the point.

const Eigen::Vector2d &e0_t1¶

[in] The final position of the first endpoint of the edge.

const Eigen::Vector2d &e1_t1¶

[in] The final position of the second endpoint of the edge.

double &toi¶

[out] Output time of impact.

const double conservative_rescaling¶

[in] The conservative rescaling of the time of impact.

Returns:¶

True if a collision was detected, false otherwise.

Nonlinear CCD¶

class NonlinearTrajectory¶

Inheritence diagram for ipc::NonlinearTrajectory:

A nonlinear trajectory is a function that maps time to a point in space.

Subclassed by ipc::IntervalNonlinearTrajectory

Public Functions

virtual ~NonlinearTrajectory() = default¶

virtual VectorMax3d operator()(const double t) const = 0¶

Compute the point’s position at time t.

virtual double max_distance_from_linear(
    const double t0, const double t1) const
    = 0¶

Compute the maximum distance from the nonlinear trajectory to a linearized trajectory.

Parameters:¶

const double t0¶

[in] Start time of the trajectory

const double t1¶

[in] End time of the trajectory

class IntervalNonlinearTrajectory
    : public virtual ipc::NonlinearTrajectory¶

Inheritence diagram for ipc::IntervalNonlinearTrajectory:

Collaboration diagram for ipc::IntervalNonlinearTrajectory:

A nonlinear trajectory with an implementation of the max_distance_from_linear function using interval arithmetic.

Public Functions

virtual ~IntervalNonlinearTrajectory() = default¶

virtual VectorMax3I operator()(const filib::Interval& t) const = 0¶

Compute the point’s position over a time interval t.

virtual double max_distance_from_linear(
    const double t0, const double t1) const¶

Compute the maximum distance from the nonlinear trajectory to a linearized trajectory.

Note

This uses interval arithmetic to compute the maximum distance. If you know a tighter bound on the maximum distance, it is recommended to override this function.

Parameters:¶

const double t0¶

[in] Start time of the trajectory

const double t1¶

[in] End time of the trajectory

bool ipc::point_point_nonlinear_ccd(const NonlinearTrajectory& p0,
    const NonlinearTrajectory& p1, double& toi,
    const double tmax = 1.0, const double min_distance = 0,
    const double tolerance = TightInclusionCCD::DEFAULT_TOLERANCE,
    const long max_iterations
    = TightInclusionCCD::DEFAULT_MAX_ITERATIONS,
    const double conservative_rescaling
    = TightInclusionCCD::DEFAULT_CONSERVATIVE_RESCALING)¶

Perform nonlinear CCD between two points moving along nonlinear trajectories.

Parameters:¶

const NonlinearTrajectory &p0¶

[in] First point’s trajectory

const NonlinearTrajectory &p1¶

[in] Second point’s trajectory

double &toi¶

[out] Output time of impact

const double tmax = 1.0¶

[in] Maximum time to check for collision

const double min_distance = 0¶

[in] Minimum separation distance between the two points

const double tolerance = TightInclusionCCD::DEFAULT_TOLERANCE¶

[in] Tolerance for the linear CCD algorithm

const long max_iterations = TightInclusionCCD::DEFAULT_MAX_ITERATIONS¶

[in] Maximum number of iterations for the linear CCD algorithm

const double conservative_rescaling = TightInclusionCCD::DEFAULT_CONSERVATIVE_RESCALING¶

[in] Conservative rescaling of the time of impact

Returns:¶

True if the two points collide, false otherwise.

bool ipc::point_edge_nonlinear_ccd(const NonlinearTrajectory& p,
    const NonlinearTrajectory& e0, const NonlinearTrajectory& e1,
    double& toi, const double tmax = 1.0,
    const double min_distance = 0,
    const double tolerance = TightInclusionCCD::DEFAULT_TOLERANCE,
    const long max_iterations
    = TightInclusionCCD::DEFAULT_MAX_ITERATIONS,
    const double conservative_rescaling
    = TightInclusionCCD::DEFAULT_CONSERVATIVE_RESCALING)¶

Perform nonlinear CCD between a point and a linear edge moving along nonlinear trajectories.

Parameters:¶

const NonlinearTrajectory &p¶

[in] Point’s trajectory

const NonlinearTrajectory &e0¶

[in] Edge’s first endpoint’s trajectory

const NonlinearTrajectory &e1¶

[in] Edge’s second endpoint’s trajectory

double &toi¶

[out] Output time of impact

const double tmax = 1.0¶

[in] Maximum time to check for collision

const double min_distance = 0¶

[in] Minimum separation distance between the point and the edge

const double tolerance = TightInclusionCCD::DEFAULT_TOLERANCE¶

[in] Tolerance for the linear CCD algorithm

const long max_iterations = TightInclusionCCD::DEFAULT_MAX_ITERATIONS¶

[in] Maximum number of iterations for the linear CCD algorithm

const double conservative_rescaling = TightInclusionCCD::DEFAULT_CONSERVATIVE_RESCALING¶

[in] Conservative rescaling of the time of impact

Returns:¶

True if the point and edge collide, false otherwise.

bool ipc::edge_edge_nonlinear_ccd(const NonlinearTrajectory& ea0,
    const NonlinearTrajectory& ea1, const NonlinearTrajectory& eb0,
    const NonlinearTrajectory& eb1, double& toi,
    const double tmax = 1.0, const double min_distance = 0,
    const double tolerance = TightInclusionCCD::DEFAULT_TOLERANCE,
    const long max_iterations
    = TightInclusionCCD::DEFAULT_MAX_ITERATIONS,
    const double conservative_rescaling
    = TightInclusionCCD::DEFAULT_CONSERVATIVE_RESCALING)¶

Perform nonlinear CCD between two linear edges moving along nonlinear trajectories.

Parameters:¶

const NonlinearTrajectory &ea0¶

[in] First edge’s first endpoint’s trajectory

const NonlinearTrajectory &ea1¶

[in] First edge’s second endpoint’s trajectory

const NonlinearTrajectory &eb0¶

[in] Second edge’s first endpoint’s trajectory

const NonlinearTrajectory &eb1¶

[in] Second edge’s second endpoint’s trajectory

double &toi¶

[out] Output time of impact

const double tmax = 1.0¶

[in] Maximum time to check for collision

const double min_distance = 0¶

[in] Minimum separation distance between the two edges

const double tolerance = TightInclusionCCD::DEFAULT_TOLERANCE¶

[in] Tolerance for the linear CCD algorithm

const long max_iterations = TightInclusionCCD::DEFAULT_MAX_ITERATIONS¶

[in] Maximum number of iterations for the linear CCD algorithm

const double conservative_rescaling = TightInclusionCCD::DEFAULT_CONSERVATIVE_RESCALING¶

[in] Conservative rescaling of the time of impact

Returns:¶

True if the two edges collide, false otherwise.

bool ipc::point_triangle_nonlinear_ccd(const NonlinearTrajectory& p,
    const NonlinearTrajectory& t0, const NonlinearTrajectory& t1,
    const NonlinearTrajectory& t2, double& toi,
    const double tmax = 1.0, const double min_distance = 0,
    const double tolerance = TightInclusionCCD::DEFAULT_TOLERANCE,
    const long max_iterations
    = TightInclusionCCD::DEFAULT_MAX_ITERATIONS,
    const double conservative_rescaling
    = TightInclusionCCD::DEFAULT_CONSERVATIVE_RESCALING)¶

Perform nonlinear CCD between a point and a linear triangle moving along nonlinear trajectories.

Parameters:¶

const NonlinearTrajectory &p¶

[in] Point’s trajectory

const NonlinearTrajectory &t0¶

[in] Triangle’s first vertex’s trajectory

const NonlinearTrajectory &t1¶

[in] Triangle’s second vertex’s trajectory

const NonlinearTrajectory &t2¶

[in] Triangle’s third vertex’s trajectory

double &toi¶

[out] Output time of impact

const double tmax = 1.0¶

[in] Maximum time to check for collision

const double min_distance = 0¶

[in] Minimum separation distance between the two edges

const double tolerance = TightInclusionCCD::DEFAULT_TOLERANCE¶

[in] Tolerance for the linear CCD algorithm

const long max_iterations = TightInclusionCCD::DEFAULT_MAX_ITERATIONS¶

[in] Maximum number of iterations for the linear CCD algorithm

const double conservative_rescaling = TightInclusionCCD::DEFAULT_CONSERVATIVE_RESCALING¶

[in] Conservative rescaling of the time of impact

Returns:¶

True if the point and triangle collide, false otherwise.

Generic Interface¶

bool ipc::conservative_piecewise_linear_ccd(
    const std::function<double(const double)>& distance,
    const std::function<double(const double, const double)>&
        max_distance_from_linear,
    const std::function<bool(const double, const double,
        const double, const bool, double&)>& linear_ccd,
    double& toi, const double tmax = 1.0,
    const double min_distance = 0,
    const double conservative_rescaling
    = TightInclusionCCD::DEFAULT_CONSERVATIVE_RESCALING)¶

Perform conservative piecewise linear CCD of a nonlinear trajectories.

Parameters:¶

const std::function<double(const double)> &distance¶

[in] Return the distance for a given time in [0, 1].

const std::function<double(const double, const double)> &max_distance_from_linear¶

[in] Return the maximum distance from the linearized trajectory for a given time interval.

const std::function<bool(const double, const double, const double, const bool, double&)> &linear_ccd¶

[in] Perform linear CCD on a given time interval.

double &toi¶

[out] Output time of impact.

const double tmax = 1.0¶

[in] Maximum time to check for collision.

const double min_distance = 0¶

[in] Minimum separation distance between the objects.

const double conservative_rescaling = TightInclusionCCD::DEFAULT_CONSERVATIVE_RESCALING¶

[in] Conservative rescaling of the time of impact.

Returns:¶

Miscellaneous¶

bool ipc::point_static_plane_ccd(const VectorMax3d& p_t0,
    const VectorMax3d& p_t1, const VectorMax3d& plane_origin,
    const VectorMax3d& plane_normal, double& toi,
    const double conservative_rescaling
    = TightInclusionCCD::DEFAULT_CONSERVATIVE_RESCALING)¶

Computes the time of impact between a point and a static plane in 3D using continuous collision detection.

Parameters:¶

const VectorMax3d &p_t0¶

[in] The initial position of the point.

const VectorMax3d &p_t1¶

[in] The final position of the point.

const VectorMax3d &plane_origin¶

[in] The origin of the plane.

const VectorMax3d &plane_normal¶

[in] The normal of the plane.

double &toi¶

[out] Output time of impact.

const double conservative_rescaling = TightInclusionCCD::DEFAULT_CONSERVATIVE_RESCALING¶

[in] Conservative rescaling of the time of impact.

Returns:¶

True if a collision was detected, false otherwise.