VfxPhysicsDragModifier

Inheritance 1 ancestor · 14 siblings

VfxPhysicsModifierBase

Class Documentation

A physics modifier that sets the particles' drag. It does not move the particles itself. Other parts of the physics read its drag value:

The position-based integration of VfxModularPhysicsComponent reduces the particle's velocity by the fraction drag * dt, clamped to [0, 1], on every step.
VfxPhysicsVelocityModifier uses it to slow down the velocity it applies.
VfxPhysicsOrbitModifier uses it to slow down the orbit, when its ApplyDrag is set.

The drag value is 0.5 * InitialDrag * KeyedDrag, per second. The position-based model uses only the length of that vector, so different values per axis act as one value. The explicit model applies the drag per axis.

Properties

InitialDrag

Embed<VfxVector3DynamicProperty> = { "Vector3": {} }

Type history (2 revisions)

15.22 - 15.23 Embed<ValueVector3>
since 15.24 Embed<VfxVector3DynamicProperty>

Documentation Edit documentation

Drag of the particle, evaluated once per particle at spawn. Half of it is stored as the particle's drag coefficient. Required: if the driver is null, the modifier does nothing.

IsUniform

Flag = false

15.24

Documentation Edit documentation

Uses the X component of the drag for all three axes.

KeyedDrag

Embed<VfxVector3DynamicProperty> = { "Vector3": {} }

15.24

Documentation Edit documentation

Multiplier on the stored drag, evaluated on every step.

drag

Embed<ValueVector3> = { "constantValue": [0, 0, 0], "dynamics": null }

Removed in 15.24

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