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BlueprintAPI > BlueprintAPI/Utilities > BlueprintAPI/Utilities/Struct
Adds a node that create a 'Sim Space Settings' from its members
Inputs
| Type | Name | Description |
|---|---|---|
| real | World Alpha | Global multipler on the effects of simulation space movement. Must be in range [0, 1]. If WorldAlpha = 0.0, the system is disabled and the simulation willbe fully local (i.e., world-space actor movement and rotation does not affect the simulation). When WorldAlpha = 1.0 the simulation effectively acts as aworld-space sim, but with the ability to apply limits using the other parameters. |
| real | Velocity Scale Z | Multiplier on the Z-component of velocity and acceleration that is passed to the simulation. Usually from 0.0 to 1.0 toreduce the effects of jumping and crouching on the simulation, but it can be higher than 1.0 if you need to exaggerate this motion for some reason.Should probably have been called "WorldAlphaScaleZ". |
| real | Damping Alpha | A muliplier to control how much of the simulation space movement is used to calculate the drag forces from Linear/Angular Damping in the Physics Asset.When DampingAlpha=1.0, Damping drag forces are equivalent to a world-space simulation. This is similar to air resistance.When DampingAlpha=0.0, Damping drag forces depend only on local-space body velocity and not on the simulation space velocity.It can be useful to set this to zero so that the Linear/Angular Damping settings on the BodyInstances do not contribute to air resistance.Air resistance can be re-added in a controlled way using the ExternalLinearDrag setting below. |
| real | Max Linear Velocity | A clamp on the effective world-space velocity that is passed to the simulation. Units are cm/s. The default value effectively means "unlimited". It is not usually required tochange this but you would reduce this to limit the effects of drag on the bodies in the simulation (if you have bodies that have LinearDrag set to non-zero in the physics asset).Expected values in this case would be somewhat less than the usual velocities of your object which is commonly a few hundred for a character. |
| real | Max Angular Velocity | A clamp on the effective world-space angular velocity that is passed to the simulation. Units are radian/s, so a value of about 6.0 is one rotation per second.The default value effectively means "unlimited". You would reduce this (and MaxAngularAcceleration) to limit how much bodies "fly out" when the actor spins on the spot.This is especially useful if you have characters than can rotate very quickly and you would probably want values around or less than 10 in this case. |
| real | Max Linear Acceleration | A clamp on the effective world-space acceleration that is passed to the simulation. Units are cm/s/s. The default value effectively means "unlimited".This property is used to stop the bodies of the simulation flying out when suddenly changing linear speed. It is useful when you have characters than canchanges from stationary to running very quickly such as in an FPS. A common value for a character might be in the few hundreds. |
| real | Max Angular Acceleration | A clamp on the effective world-space angular accleration that is passed to the simulation. Units are radian/s/s. The default value effectively means "unlimited".This has a similar effect to MaxAngularVelocity, except that it is related to the flying out of bodies when the rotation speed suddenly changes. Typical limist fora character might be around 100. |
| vector | External Linear Drag V | Additional linear drag applied to each body based on total body velocity. This is in addition to per-body linear damping in the physics asset (but see DampingAlpha to control that).(NOTE: The "V" suffix is to differentiate from the deprecated float property of the same name. It means "Vector" and not "Velocity").NOTE: ExternalLinearDragV is in simulation space, so if the RB AnimNode is set to Bone Space the ExternalLinearDragV.Z will be the drag in theUp direction of the selected bone. |
| vector | External Linear Velocity | Additional velocity that is added to the component velocity so the simulation acts as if the actor is moving at speed, even when stationary.Vector is in world space. Units are cm/s. Could be used for a wind effects etc. Typical values are similar to the velocity of the object or effect,and usually around or less than 1000 for characters/wind. |
| vector | External Angular Velocity | Additional angular velocity that is added to the component angular velocity. This can be used to make the simulation act as if the actor is rotatingeven when it is not. E.g., to apply physics to a character on a podium as the camera rotates around it, to emulate the podium itself rotating.Vector is in world space. Units are rad/s. |
Outputs
| Type | Name | Description |
|---|---|---|
| struct | Sim Space Settings |