Physics 2D reference

The following Project settings manage the global settings for Physics 2D, which define the limits on the accuracy of the physics simulation of 2D GameObjects in the Unity physics system. 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.

To open the Physics 2D project settings window, go to Edit > Project Settings… > Physics 2D to manage the global Project settings for Physics 2D

Note: To manage the global settings for 3D physics instead, refer to the Physics Project settings reference page.

General Settings tab

The following are the properties available in the General Settings tab of the Physics 2D manager window.

プロパティ	機能
Gravity (重力)	Set the amount of gravity applied to all Rigidbody 2D GameObjects. Usually you only set gravity for the negative direction of the y-axis.
Default Material	個々の 2D コライダーに割り当てられていない場合に使用する Physics Material 2D への参照を設定します。
Velocity Iterations	Set the number of iterations made by the physics system to resolve velocity effects. Higher numbers result in more accurate physics calculations but the Editor requires more CPU time.
Position Iterations	Set the number of iterations made by the physics system to resolve position changes. Higher numbers result in more accurate physics calculations but also requires more CPU time.
Bounce Threshold	Set the threshold for elastic collisions. Unity treats any collisions with a relative linear velocity below this threshold as inelastic, so no bounce will occur.
Max Linear Correction	制約を解くときに使用する最大のリニア位置補正を設定します (0.0001 から 1000000 の範囲)。これにより、オーバーシュートを防ぐことができます。
Max Angular Correction	制約を解くときに使用する最大角度補正を設定します(0.0001 から 1000000 の範囲)。これにより、オーバーシュートを防ぐことができます。
Max Translation Speed	物理演算の更新中に Rigidbody 2D ゲームオブジェクトの最大直線速度を設定します。
Max Rotation Speed	物理演算の更新中に Rigidbody 2D ゲームオブジェクトの最大回転速度を設定します。
Baumgarte Scale	Unity が衝突の重複を解決する速さを決定するスケール係数を設定します。
Baumgarte Time of Impact Scale	Unity が衝突時間の重複をどのくらい早く解決するかを決定するスケール係数を設定します。
Time to Sleep	Set 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 when they aren’t actually in contact. Colliders whose distance is less than the sum of their `contactOffset` values generate contacts, which causes the collision detection system to predictively enforce the contact constraint even when the objects are slightly separated. Caution: Reducing this value too far can slow down Unity’s ability to calculate continuous polygon collisions. Conversely, increasing the value too much might create artifacts for vertex collisions.
Simulation Mode	Select when Unity executes the 2D physics simulation.
	Fixed Update	Select this to have Unity execute the physics simulation immediately after MonoBehaviour.FixedUpdate is called.
	Update	Select this to have Unity execute the physics simulation immediately after MonoBehaviour.Update is called. When you select this mode, additional properties are visible.
	スクリプト	Select this to manually execute the physics simulation via Physics2D.Simulate.
Simulation Layers	Select which layer(s) Unity simulates when Simulation Mode is set to FixedUpdate or Update. The Everything option is selected by default, which automatically selects all layers and includes all of them in the physics simulation. You can select which specific layer(s) to include in the simulation, and Unity will only simulate the Rigidbody2D, joints, effectors, and contacts between Collider2D on those selected layers.
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 system reuse a single Collision2D instance for all collision callbacks. Disable to have the physics system create a new Collision2D instance for each collision callback instead.
Auto Sync Transforms	このオプションを有効にすると、Transform の変更を物理システムと自動的に同期させます。
Gizmos	Select the types of physics 2D gizmos to be drawn within the Editor. You may select multiple options.
	Nothing	Select this to deselect every option. No physics 2D gizmo will be drawn.
	Everything	Select this to select every option.
	All Colliders	Select this to have all Colliders drawn without having to select them in the Hierarchy window.
	Colliders Outlined	Select this to have Colliders drawn with an outline (you can customize the outline’s color in 2D Physics Preferences).
	Colliders Filled	Select this to have all Colliders drawn using the Fill color specified in the 2D Physics Preferences.
	Colliders Sleeping	Select this to have Colliders drawn to show when the Rigidbody 2D they are attached to is sleeping using the Awake or Asleep colors specified in the 2D Physics Preferences.
	Collider Contacts	Select this to have Collider contacts shown as a directional arrow that starts at the contact point in the direction of the contact normal. You can specify the Contact color of the arrow in the 2D Physics Preferences.
	Collider Bounds	Select this to have Collider bounds drawn for all PhysicsShape2D that a Collider creates. The bounds are an Axis-Aligned Bounding Box (AABB).
Multithreading	Expand this to adjust the multithreading settings. Refer to Multithreading for information about each property.

Simulation Mode: Update

The followings properties are visible only when you select Update or Script for the Simulation Mode.

プロパティ	機能
Use Sub Stepping	Enable this property to have the Editor use simulation sub-stepping during the simulation step.
Use Sub Step Count	Enable this property to have the Editor calculate contacts for all simulation sub-steps. This provides a more exact simulation for each sub-step but will reduce performance. Disable this property to only calculate contacts for the first simulation sub-step.
Max Sub Step Count	Sets the maximum number of simulation sub-steps allowed per-frame when simulation sub-stepping is enabled and actively running. This will also limit the amount of time the Editor spends on sub-stepping.
Min Sub Step FPS	Sets the minimum frames-per-second allowed for a simulation step before the Editor begins to use sub-stepping. When the current frame rate is lower than this value, the Editor will use simulation sub-stepping if Use Sub Stepping is enabled.

Multithreading

The settings in the Multithreading section allow you to use the C# Job System to configure multithreaded physics.

プロパティ	機能
Use Multithreading	このオプションを有効にすると、ジョブシステムを使用してシミュレーションステップを実行し、残りのオプションを使用して制御できます。
Use Consistency Sorting	一貫性のある処理順を維持することがシミュレーションにとって重要になる場合は、このオプションを有効にします。複数の CPU スレッドでシミュレーションステップを実行すると、別々のバッチデータが生成されます。これらの別々のバッチを処理することで、より高速な結果が得られますが、処理順序の決定性は低下します。
Interpolation Poses Per Job	各シミュレーションジョブで補間される Rigidbody 2D オブジェクトの最小数を設定します。
New Contacts Per Job	各シミュレーションジョブで検索する新しい接触の最小数を設定します。
Collide Contacts Per Job	各シミュレーションジョブで衝突させる接触の最小数を設定します。
Clear Flags Per Job	各シミュレーションジョブでクリアするフラグの最小数を設定します。
Clear Body Forces Per Job	各シミュレーションジョブでクリアするボディの最小数を設定します。
Sync Discrete Fixtures Per Job	各シミュレーションジョブでの非連続的なアイランドの解決中に、ブロードフェーズで同期するフィクスチャの最小数を設定します。
Sync Continuous Fixtures Per Job	各シミュレーションジョブでの連続的なアイランドの解決中に、ブロードフェーズで同期するフィクスチャの最小数を制御します。
Find Nearest Contacts Per Job	各シミュレーションジョブで検索する最も距離が近い接触の最小数を設定します。
Update Trigger Contacts Per Job	各シミュレーションジョブで更新するトリガーの接触の最小数を設定します。
Island Solver Cost Threshold	非連続的なアイランドの解決の間の、1 つのアイランドでの、すべての物体、接触、およびジョイントのコストの最小しきい値。
Island Solver Body Cost Scale	非連続的なアイランドの解決の間の、各ボディのコストスケールを設定します。
Island Solver Contact Cost Scale	非連続的なアイランドの解決の間の、各接触のコストスケールを設定します。
Island Solver Joint Cost Scale	非連続的なアイランドの解決の間の、各ジョイントのコストスケールを設定します。
Island Solver Bodies Per Job	アイランドの解決を行う場合に、各シミュレーションジョブで解決するボディの最小数を設定します。
Island Solver Contacts Per Job	アイランドの解決を行う場合に、各シミュレーションジョブで解決する接触の最小数を設定します。

Layer Collision Matrix tab

The Layer Collision Matrix tab settings control whether Colliders (attached to different Rigidbody 2Ds) can come into contact which each other, based on the Layer assigned to the GameObject they are on. The matrix displays each Layer against every other Layer, allowing you to select which specific Layers can come into contact with another.

A check mark at the intersection between two Layers indicates that contact is allowed between those two Layers, while a cleared checkbox indicates that contact between those two Layers is never allowed. When you hover over a Layer’s name or a checkbox, its row and column are highlighted to make it easier to see which Layers its affects.

Tip: To optimize for the best possible performance, you should ensure that only the minimum number of potential contacts are selected by only selecting the specific Layers that you want to have contact with others, and disabling all other unnecessary contacts. To help with this, you can select Disable All or Enable All to quickly select or deselect all options at once. and then select the specific Layers.

その他の参考資料

Physics2DManager

Physics

Player 設定

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