Sorry yea I was just going by memory..."parent shape surface" is the correct label. It should sample a random point on the shape of the particle that's doing the spawning.
As for sending out particles, the spawn operator has its own little output nub as you can see, and that will send all child particles. Child particles copy all properties of their parent, but you can strip those out in the next event. For example, there is a "shape remove" operator that removes a particle's shape, and you can tweak how much spin/speed/scale child particles will inherit from their parent in the spawn operator itself.
Attached is an image/flow showing some particles with large shapes having smaller particles spawned on them.
One extra thing worth mentioning: when setting up this test I noticed at lower spawn particle counts, the distribution on the parent shape surface seems oddly biased (not all faces getting same # of particles)...most likely a bug. I will fix that for the next release.
As for sending out particles, the spawn operator has its own little output nub as you can see, and that will send all child particles. Child particles copy all properties of their parent, but you can strip those out in the next event. For example, there is a "shape remove" operator that removes a particle's shape, and you can tweak how much spin/speed/scale child particles will inherit from their parent in the spawn operator itself.
Attached is an image/flow showing some particles with large shapes having smaller particles spawned on them.
One extra thing worth mentioning: when setting up this test I noticed at lower spawn particle counts, the distribution on the parent shape surface seems oddly biased (not all faces getting same # of particles)...most likely a bug. I will fix that for the next release.