the xpresso node you want is PDeflector but in the Content Browser Presets/Studio/Simulation/Thinking Particles/Interaction/TP Object Collision is a preset to simplify things (or at least give you an example if you want to DIY)
thanks Brian, nearly there now. All I need to do is get a couple of TP streams of particles to follow approximately a given path. It’s a medical piece concerning eye anatomy and I need to demonstrate the flow of pigment from the source where it originates to the back of the cornea where it deposits. I have the particle streams, the deflectors, particle geometry all working. I’d really now like to direct the (diffuse) streams onto the appropriate paths. Is there some way to get the particles to roughly follow a spline?
XdcamEx & HD, C300, DSLRs, all sorts of production & post gear and a very untidy desk. On the East Coast of the UK
another of the presets should get you there – TP Follow Spline – I don’t know how ‘roughly’ that is, it seems to keep initial spacing by default, however, Precision, Point Velocity and Tangent Velocity seems to be the way to get a more approximate follow, you can lower Precision and Tangent and get pretty predictable results. Point Velocity is weirder, below the default 0.1 and it gets less able to follow, between 0.1 and 1 it will ‘focus’ along the length of the spline and at 1 and 1+ it glues all particles to the spline, touchy but interesting