Offset of the shape from the particle's birth position, in world units, in the particle's reference frame.
IVfxEmissionSource
15.24 Interface
Inheritance 7 descendants
Class Documentation
Edit documentationA shape that the birth points of a component emitter's particles are sampled from, held
by VfxPhysicsPositionModifier.EmissionSource.
For each new particle the source returns a point, which is added to the particle's
birth offset, and an emission normal, which
VfxPhysicsVelocityModifier uses as the radial
direction.
| Source | Point | Normal |
|---|---|---|
| VfxEmissionPoint | the shape's centre | a random direction |
| VfxEmissionBox | on a face, inside, or on a corner | the face normal, or the corner's diagonal |
| VfxEmissionSphere | on the surface | away from the frame origin |
| VfxEmissionCylinder | on the side, optionally on the caps | along +Y or -Y on a cap |
| VfxEmissionMesh | on a triangle of a static mesh | the triangle's normal |
| VfxEmissionSkin | on the bound unit's skinned mesh, in its current pose | the skinned surface normal |
| VfxEmissionSkeleton | along a bone of the bound unit's skeleton | at right angles to the bone |
Shape transform. scale, rotation and ShapeCenter are evaluated once per spawn,
for the whole batch of new particles. The sampled point is scaled, rotated and moved by
ShapeCenter. The normal is only rotated.
Normal after spawn. From the particle's second step on, the emission normal is recomputed on every step from the particle's current position. For a point, mesh, skin or skeleton source it is the direction from the source's origin to the particle. For a box it is the outward normal of the face on the side of the position's largest coordinate. A sphere and a cylinder compute it from their own shape.
Properties
Euler rotation of the shape, in degrees. It turns the sampled point and the normal.
Per-axis scale of the shape. It scales the sampled point but not the normal.