Physics 2D

Apply global settings for Physics 2D with the following properties. If you want to manage the global settings for 3D physics, then refer to the Physics Manager settings instead.

The Physics 2D settings define limits on the accuracy of the physics simulation. A more accurate simulation requires more processing overhead, and these settings allow you to adjust the trade off between accuracy and performance that best suits your project. Refer to the Physics page for further information.

*Свойство:*	*Функция:*
Gravity	Set the amount of gravity applied to all Rigidbody 2D GameObjects. Generally, you only set gravity for the negative direction of the y-axis.
Default Material	Set a reference to the Physics Material 2D to use if none has been assigned to an individual Collider 2D.
Velocity Iterations	Set the number of iterations made by the physics engine to resolve velocity effects. Higher numbers result in more accurate physics calculations but at the cost of CPU time.
Position Iterations	Set the number of iterations made by the physics engine to resolve position changes. Higher numbers result in more accurate physics calculations but at the cost of CPU time.
Velocity Threshold	Set the threshold for elastic collisions. Unity treats collisions with a relative velocity lower than this value as inelastic collisions (that is, the colliding GameObjects do not bounce off each other).
Max Linear Correction	Set the maximum linear position correction used when solving constraints (from a range between 0.0001 to 1000000). This helps to prevent overshooting.
Max Angular Correction	Set the maximum angular correction used when solving constraints (from a range between 0.0001 to 1000000). This helps to prevent overshooting.
Max Translation Speed	Set the maximum linear speed of a Rigidbody 2D GameObject during any physics update.
Max Rotation Speed	Set the maximum rotation speed of a Rigidbody 2D GameObject during any physics update.
Baumgarte Scale	Set the scale factor that determines how fast Unity resolves collision overlaps.
Baumgarte Time of Impact Scale	Set the scale factor that determines how fast Unity resolves time-of-impact overlaps.
Time to Sleep	The time (in seconds) that must pass after a Rigidbody 2D stops moving before it goes to sleep.
Linear Sleep Tolerance	Set the linear speed below which a Rigidbody 2D goes to sleep after the Time to Sleep elapses.
Angular Sleep Tolerance	Set the rotational speed below which a Rigidbody 2D goes to sleep after Time to Sleep elapses.
Default Contact Offset	Set a proximity distance value for Colliders to be considered in contact, even though they are not actually in contact. Colliders whose distance is less than the sum of their contactOffset values generate contacts. This allows the collision detection system to predictively enforce the contact constraint even when the objects are slightly separated. Caution: Reducing this value too far could cripple Unity’s ability to calculate continuous polygon collisions. Conversely, increasing the value too much could create artifacts for vertex collisions.
Simulation Mode	Select when Unity executes the 2D physics simulation from the drop-down menu.
Fixed Update	Select this to have Unity execute the physics simulation immediately after the MonoBehaviour.FixedUpdate is called.
Update	Select this to have Unity execute the physics simulation immediately after the MonoBehaviour.Update is called.
Script	Select this to manually execute the physics simulation via script.
Queries Hit Triggers	Enable this option if you want Collider 2Ds marked as Triggers to return a hit when any physics query (such as Linecasts or Raycasts) intersects with them. Defaults to enabled.
Queries Start In Colliders	Enable this option if you want physics queries that start inside a Collider 2D to detect the collider they start in.
Callbacks On Disable	Enable this option to produce collision callbacks when a collider with contacts is disabled.
Reuse Collision Callbacks	Enable this setting to have the physics engine reuse a single Collision2D instance for all collision callbacks. Disable to have the physics engine create a new Collision2D instance for each collision callback instead.
Auto Sync Transforms	Enable this option to automatically sync transform changes with the physics system.
Job Options (Experimental)	See the Job Options section below.
Gizmos	See the Gizmos section below.
Layer Collision Matrix	Define how the layer-based collision detection system behaves. Select which layers on the Collision Matrix interact with the other layers by checking them.

Job Options

The settings in the Job Options section allow you to use the C# Job System to configure multi-threaded physics.

Property:	Function:
Use Multithreading	Enable this option to execute the simulation steps using the job system and use the rest of these options to control how to achieve that.
Use Consistency Sorting	Enable this option if maintaining a consistent processing order becomes important to the simulation. Executing simulation steps on multiple CPU threads produces separate batches of data. Processing these separate batches reduces determinism in processing order, although produces faster results.
Interpolation Poses Per Job	Set the minimum number of Rigidbody 2D objects being interpolated in each simulation job.
New Contacts Per Job	Set the minimum number of new contacts to find in each simulation job.
Collide Contacts Per Job	Set the minimum number of contacts to collide in each simulation job.
Clear Flags Per Job	Set the minimum number of flags to be cleared in each simulation job.
Clear Body Forces Per Job	Set the minimum number of bodies to be cleared in each simulation job.
Sync Discrete Fixtures Per Job	Set the minimum number of fixtures to synchronize in the broadphase during discrete island solving in each simulation job.
Sync Continuous Fixtures Per Job	Set the minimum number of fixtures to synchronize in the broadphase during continuous island solving in each simulation job.
Find Nearest Contacts Per Job	Set the minimum number of nearest contacts to find in each simulation job.
Update Trigger Contacts Per Job	Set the minimum number of trigger contacts to update in each simulation job.
Island Solver Cost Threshold	Set the minimum threshold cost of all bodies, contacts and joints in an island during discrete island solving.
Island Solver Body Cost Scale	Set the cost scale of each body during discrete island solving.
Island Solver Contact Cost Scale	Set the cost scale of each contact during discrete island solving.
Island Solver Joint Cost Scale	Set the cost scale of each joint during discrete island solving.
Island Solver Bodies Per Job	Set the minimum number of bodies to solve in each simulation job when performing island solving.
Island Solver Contacts Per Job	Set the minimum number of contacts to solve in each simulation job when performing island solving.

Gizmos

Property:	Function:
Always Show Colliders	Enable this option to show collider gizmos even when they are not selected.
Show Collider Sleep	Enable this option to show the sleep-state for each collider.
Collider Awake Color	Set the color to indicate that the collider (body) is awake.
Collider Asleep Color	Set the color to indicate that the collider (body) is asleep.
Show Collider Contacts	Enable this option to show current contacts for each gizmo.
Contact Arrow Scale	Set the size of the contact arrow that appears on collider gizmos.
Collider Contact Color	Set the gizmo color to indicate the collider contact.
Show Collider AABB	Enable this option to show the collider’s bounding box.
Collider AABB Color	Set the gizmo color for the collider’s bounding box.

2018–10–02 Page amended
Updated for Unified Settings

Physics

Player

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Manual

Physics 2D

Job Options

Gizmos