Why does my Set Attribute From Map drop the value the receiver should get?

Set Attribute runs after Inherit blocks. If you Set then expect Inherit to pick up, the order is wrong. Inherit reads from the event payload before Set runs.

Inherit Source Attribute → Get Attribute on receiver. Set Attribute on receiver overwrites whatever was inherited. Order matters in the Init context.

Custom attribute via map?

Custom attributes propagate the same way: source emitter sets a custom attribute, sends event with custom in payload, receiver inherits and reads.

Fix: VFX Graph Set Attribute From Map Drops

Quick answer: Inherit Source Attribute first, then Get Attribute. Set Attribute overwrites; place it after Inherit if you want to combine.

Position from event was set per particle. Receiver shows them all at origin. Set Attribute From Map ran in receiver Init with default 0, overwriting the inherit.

The Fix

Receiver Init context order:
  1. Inherit Source Attribute (Position) from event
  2. (optional) Set Attribute From Map (offset relative to inherited)
  3. Set Lifetime, Color etc.

// Inherit reads event payload; Set with explicit Source = Get Attribute(Position)
// chains additional offset

Order in Init is left-to-right block evaluation. Inherit must precede the Set you want to honor it.

Verifying

Receiver spawns at correct positions per event. Without Inherit first: all at origin.

“Inherit then Set. Order matters.”

Related Issues

For VFX Graph GPUEvent, see GPUEvent. For VFX Graph curve sample, see curve flat.

Inherit first. Set later.