Struct rapier3d::dynamics::IntegrationParameters
source · pub struct IntegrationParameters {Show 14 fields
pub dt: Real,
pub min_ccd_dt: Real,
pub erp: Real,
pub damping_ratio: Real,
pub joint_erp: Real,
pub joint_damping_ratio: Real,
pub allowed_linear_error: Real,
pub max_penetration_correction: Real,
pub prediction_distance: Real,
pub num_solver_iterations: NonZeroUsize,
pub num_additional_friction_iterations: usize,
pub num_internal_pgs_iterations: usize,
pub min_island_size: usize,
pub max_ccd_substeps: usize,
}
Expand description
Parameters for a time-step of the physics engine.
Fields§
§dt: Real
The timestep length (default: 1.0 / 60.0
)
min_ccd_dt: Real
Minimum timestep size when using CCD with multiple substeps (default 1.0 / 60.0 / 100.0
)
When CCD with multiple substeps is enabled, the timestep is subdivided
into smaller pieces. This timestep subdivision won’t generate timestep
lengths smaller than min_ccd_dt
.
Setting this to a large value will reduce the opportunity to performing CCD substepping, resulting in potentially more time dropped by the motion-clamping mechanism. Setting this to an very small value may lead to numerical instabilities.
erp: Real
0-1: multiplier for how much of the constraint violation (e.g. contact penetration)
will be compensated for during the velocity solve.
(default 0.8
).
damping_ratio: Real
0-1: the damping ratio used by the springs for Baumgarte constraints stabilization.
Lower values make the constraints more compliant (more “springy”, allowing more visible penetrations
before stabilization).
(default 0.25
).
joint_erp: Real
0-1: multiplier for how much of the joint violation
will be compensated for during the velocity solve.
(default 1.0
).
joint_damping_ratio: Real
The fraction of critical damping applied to the joint for constraints regularization.
(default 0.25
).
allowed_linear_error: Real
Amount of penetration the engine wont attempt to correct (default: 0.001m
).
max_penetration_correction: Real
Maximum amount of penetration the solver will attempt to resolve in one timestep.
prediction_distance: Real
The maximal distance separating two objects that will generate predictive contacts (default: 0.002
).
num_solver_iterations: NonZeroUsize
The number of solver iterations run by the constraints solver for calculating forces (default: 4
).
num_additional_friction_iterations: usize
Number of addition friction resolution iteration run during the last solver sub-step (default: 4
).
num_internal_pgs_iterations: usize
Number of internal Project Gauss Seidel (PGS) iterations run at each solver iteration (default: 1
).
min_island_size: usize
Minimum number of dynamic bodies in each active island (default: 128
).
max_ccd_substeps: usize
Maximum number of substeps performed by the solver (default: 1
).
Implementations§
source§impl IntegrationParameters
impl IntegrationParameters
sourcepub fn switch_to_standard_pgs_solver(&mut self)
pub fn switch_to_standard_pgs_solver(&mut self)
Configures the integration parameters to match the old PGS solver from Rapier version <= 0.17.
This solver was slightly faster than the new one but resulted in less stable joints and worse convergence rates.
This should only be used for comparison purpose or if you are experiencing problems with the new solver.
NOTE: this does not affect any [RigidBody::additional_solver_iterations
] that will
still create solver iterations based on the new “small-steps” PGS solver.
NOTE: this resets Self::erp
, Self::damping_ratio
, Self::joint_erp
,
Self::joint_damping_ratio
to their former default values.
sourcepub fn switch_to_small_steps_pgs_solver(&mut self)
pub fn switch_to_small_steps_pgs_solver(&mut self)
Configures the integration parameters to match the new “small-steps” PGS solver from Rapier version >= 0.18.
The “small-steps” PGS solver is the default one given by Self::default()
so
calling this function is generally not needed unless
Self::switch_to_standard_pgs_solver()
was called.
This solver results in more stable joints and significantly better convergence rates but is slightly slower in its default settings.
NOTE: this resets Self::erp
, Self::damping_ratio
, Self::joint_erp
,
Self::joint_damping_ratio
to their default values.
sourcepub fn inv_dt(&self) -> Real
pub fn inv_dt(&self) -> Real
The inverse of the time-stepping length, i.e. the steps per seconds (Hz).
This is zero if self.dt
is zero.
sourcepub fn set_dt(&mut self, dt: Real)
👎Deprecated: You can just set the IntegrationParams::dt
value directly
pub fn set_dt(&mut self, dt: Real)
IntegrationParams::dt
value directlySets the time-stepping length.
sourcepub fn set_inv_dt(&mut self, inv_dt: Real)
pub fn set_inv_dt(&mut self, inv_dt: Real)
Sets the inverse time-stepping length (i.e. the frequency).
This automatically recompute self.dt
.
sourcepub fn erp_inv_dt(&self) -> Real
pub fn erp_inv_dt(&self) -> Real
The ERP coefficient, multiplied by the inverse timestep length.
sourcepub fn joint_erp_inv_dt(&self) -> Real
pub fn joint_erp_inv_dt(&self) -> Real
The joint ERP coefficient, multiplied by the inverse timestep length.
sourcepub fn cfm_factor(&self) -> Real
pub fn cfm_factor(&self) -> Real
The CFM factor to be used in the constraints resolution.
sourcepub fn joint_cfm_coeff(&self) -> Real
pub fn joint_cfm_coeff(&self) -> Real
The CFM (constraints force mixing) coefficient applied to all joints for constraints regularization
Trait Implementations§
source§impl Clone for IntegrationParameters
impl Clone for IntegrationParameters
source§fn clone(&self) -> IntegrationParameters
fn clone(&self) -> IntegrationParameters
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for IntegrationParameters
impl Debug for IntegrationParameters
source§impl Default for IntegrationParameters
impl Default for IntegrationParameters
source§impl<'de> Deserialize<'de> for IntegrationParameters
impl<'de> Deserialize<'de> for IntegrationParameters
source§fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>where
__D: Deserializer<'de>,
fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>where
__D: Deserializer<'de>,
source§impl Serialize for IntegrationParameters
impl Serialize for IntegrationParameters
impl Copy for IntegrationParameters
Auto Trait Implementations§
impl RefUnwindSafe for IntegrationParameters
impl Send for IntegrationParameters
impl Sync for IntegrationParameters
impl Unpin for IntegrationParameters
impl UnwindSafe for IntegrationParameters
Blanket Implementations§
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
source§impl<T> Downcast for Twhere
T: Any,
impl<T> Downcast for Twhere
T: Any,
source§fn into_any(self: Box<T>) -> Box<dyn Any>
fn into_any(self: Box<T>) -> Box<dyn Any>
Box<dyn Trait>
(where Trait: Downcast
) to Box<dyn Any>
. Box<dyn Any>
can
then be further downcast
into Box<ConcreteType>
where ConcreteType
implements Trait
.source§fn into_any_rc(self: Rc<T>) -> Rc<dyn Any>
fn into_any_rc(self: Rc<T>) -> Rc<dyn Any>
Rc<Trait>
(where Trait: Downcast
) to Rc<Any>
. Rc<Any>
can then be
further downcast
into Rc<ConcreteType>
where ConcreteType
implements Trait
.source§fn as_any(&self) -> &(dyn Any + 'static)
fn as_any(&self) -> &(dyn Any + 'static)
&Trait
(where Trait: Downcast
) to &Any
. This is needed since Rust cannot
generate &Any
’s vtable from &Trait
’s.source§fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)
fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)
&mut Trait
(where Trait: Downcast
) to &Any
. This is needed since Rust cannot
generate &mut Any
’s vtable from &mut Trait
’s.source§impl<T> DowncastSync for T
impl<T> DowncastSync for T
§impl<T> Pointable for T
impl<T> Pointable for T
source§impl<SS, SP> SupersetOf<SS> for SPwhere
SS: SubsetOf<SP>,
impl<SS, SP> SupersetOf<SS> for SPwhere
SS: SubsetOf<SP>,
source§fn to_subset(&self) -> Option<SS>
fn to_subset(&self) -> Option<SS>
self
from the equivalent element of its
superset. Read moresource§fn is_in_subset(&self) -> bool
fn is_in_subset(&self) -> bool
self
is actually part of its subset T
(and can be converted to it).source§fn to_subset_unchecked(&self) -> SS
fn to_subset_unchecked(&self) -> SS
self.to_subset
but without any property checks. Always succeeds.source§fn from_subset(element: &SS) -> SP
fn from_subset(element: &SS) -> SP
self
to the equivalent element of its superset.