【物理约束参考指南 | Unreal Engine】

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This page contains a reference listing of properties in the Physics Constraints.
Properties
Below are the properties for Physics Constraints separated by major category.
   
Constraint

Property

Description

约束 Actor 1
Pointer to first Actor to constrain.
组件资源文件名称 1
Name of first component property to constrain. If Actor1 is NULL, will look within Owner. If this is NULL, will use RootComponent of Actor1
约束Actor 2
Pointer to second Actor to constrain.
组件资源文件名称2
Name of second component property to constrain. If Actor2 is NULL, will look within Owner. If this is NULL, will use RootComponent of Actor2
关节资源文件名称
Name of bone that this joint is associated with.
约束骨骼1
Name of first bone (body) that this constraint is connecting. This will be the 'child' bone in a PhysicsAsset.
约束骨骼2
Name of second bone (body) that this constraint is connecting. This will be the 'parent' bone in a PhysicsAset.
禁用碰撞   
Projection

Property

Description

Enable Projection
If distance error between bodies exceeds 0.1 units, or rotation error exceeds 10 degrees, body will be projected to fix this. For example a chain spinning too fast will have its elements appear detached due to velocity, this will project all bodies so they still appear attached to each other.
Projection Linear Tolerance
Linear tolerance value in world units. If the distance error exceeds this tolarance limit, the body will be projected.
Projection Angular Tolerance
Angular tolerance value in world units. If the distance error exceeds this tolarance limit, the body will be projected.
   
Joint Presets

Property

Description

Hinge（铰链式）锁定 线性运动, 锁定 摇动,并设置    角扭动 为 自由 。经典的门铰链或膝盖关节。Prismatic(棱柱式)锁定  摇动, 锁定 角扭动, 锁定 线性Y运动 和 线性Z 运动, 并设置 Linear ZMotion（线性Z运动） 为 自由 。比如水利活塞。Ball and Socket（球窝式）锁定 所有 线性运动 ，设置 摇动 和 扭动 为 自由 。完全自由地旋转，和沙袋或破碎球。   
Linear Limits

Property

Description

Linear XMotion
Indicates whether linear motion along the x axis is allowed, blocked or limited. If limited, the LinearLimit property will be used to determine if a motion is allowed. See ELinearConstraintMotion.
Linear YMotion
Indicates whether linear motion along the y axis is allowed, blocked or limited. If limited, the LinearLimit property will be used to determine if a motion is allowed. See ELinearConstraintMotion.
Linear ZMotion
Indicates whether linear motion along the z axis is allowed, blocked or limited. If limited, the LinearLimit property will be used to determine if a motion is allowed. See ELinearConstraintMotion.
Linear Limit Size
The limiting extent in world units of the linear motion for limited motion axes.

Advanced

Property

Description

Linear Limit Soft
Whether we want to use soft limits instead of hard limits. With enabled soft limit, a constraint is used instead of hard-capping the motion.
Linear Limit Stiffness
Stiffness of the linear soft limit constraint. Only used, when bLinearLimitSoft is true.
Linear Limit Damping
Damping of the linear soft limit constraint. Only used, when bLinearLimitSoft is true.
Linear Breakable
Defines whether the joint is breakable or not.
Linear Break Threshold
Force needed to break the joint.
   
Angular Limits

Property

Description

Angular Swing 1Motion
Indicates whether rotation about the Z axis is allowed, blocked, or limited. If limited, the AngularLimit property will be used to determine the range of motion. See EAngularConstraintMotion.
Angular Twist Motion
Indicates whether rotation about the the X axis is allowed, blocked, or limited. If limited, the AngularLimit property will be used to determine the range of motion. See EAngularConstraintMotion.
Angular Swing 2Motion
Indicates whether rotation about the Y axis is allowed, blocked, or limited. If limited, the AngularLimit property will be used to determine the range of motion. See EAngularConstraintMotion.
Swing 1Limit Angle
Used if swing motion along the y axis is limited. The limit angle is specified in degrees and should be between 0 and 180.
Twist Limit Angle
Used if twist motion along the x axis is limited. The limit angle is specified in degrees and should be between 0 and 180.
Swing 2Limit Angle
Used if swing motion along the z axis is limited. The limit angle is specified in degrees and should be between 0 and 180.
Angular Rotation Offset
Specifies the angular offset between the two frames of reference. By default limit goes from (-Angle, +Angle) This allows you to bias the limit for swing1 swing2 and twist.

Advanced

Property

Description

Swing Limit Soft
Whether we want to use soft limits for swing motions instead of hard limits. With enabled soft limit, a constraint is used instead of hard-capping the motion.
Swing Limit Stiffness
Stiffness of the swing limit constraint if soft limit is used for swing motions.
Swing Limit Damping
Damping of the swing limit constraint if soft limit is used for swing motions.
Twist Limit Soft
Whether we want to use soft limits for twist motions instead of hard limits. With enabled soft limit, a constraint is used instead of hard-capping the motion.
Twist Limit Stiffness
Stiffness of the twist limit constraint if soft limit is used for twist motions.
Twist Limit Damping
Damping of the twist limit constraint if soft limit is used for twist motions.
Angular Breakable
Whether it is possible to break the joint with angular force.
Angular Break Threshold
Angular force needed to break the joint.
   
Linear Motor

Property

Description

Linear Position Drive
Enables/Disables linear position drive.
Linear Position Target
Target position the linear drive. Only the components that are enabled are used.
Linear Position Strength
Spring to apply to the for linear drive.
Linear Velocity Drive
Enables/Disables linear velocity drive.
Linear Velocity Target
Target velocity the linear drive.
Linear Velocity Strength
Damping to apply to the for linear drive.
Max Linear Force
Limit to the force the linear drive can apply.
   
Angular Motor

Property

Description

Angular Orientation Drive
Enables the angular drive towards a target orientation.
Angular Orientation Target
Target orientation for the angular drive.
Angular Orientation Strength
Spring value to apply to the for angular drive.
Angular Velocity Drive
Enables the angular drive towards a target velocity.
Angular Velocity Target
Target velocity for the angular drive.
Angular Velocity Strength
Damping value to apply to the for angular drive.
Max Angular Force
Limit to the force the angular drive can apply.
Angular Drive Mode
The way rotation paths are estimated.

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