Particles in Dynamics
Updated: Sept 5 2016
Now that particles (in the documentation they call them dop particles) have been integrated into dops here are some useful links and tips:
For those of you familiar with the old way of
doing things, here is a useful comparison
- turn on the display flag on or after the pop solver
- now you must disconnect or bypass the pop to disable
- External Forces parameter (is on by default) in the popsolver
- Curve Force tool - there is now a curve force tool to make particles move along a path (we'll talk about the vops way as well)
- Flock tool
- following a leader here
Vexpressions - http://www.sidefx.com/docs/houdini14.0/dopparticles/vexpressions
note that if the Use VEXpressions checkbox is off, the parameters use Houdini expression language, but values cannot vary per-particle. With it on, you can write VEX code snippets to evaluate on each particle at each time step.
on Vex snippets can be found here.
CTRL-ENTER to commit changes in the vex snippet window, also
works on the font node)
pre-made snippets are contained in the multi-line editor drop-down menu
Rather than copying onto the points you can still use instancing see http://www.sidefx.com/docs/houdini14.0/dopparticles/instancingAlso there is an fx guide about H13 http://www.fxguide.com/quicktakes/side-effects-houdini-13-we-ask-them-about-their-fea/
And now fx guide about H14 http://www.fxguide.com/quicktakes/houdini-14-gives-you-more-crowds-and-sand/
Under Tips and Tricks there is more information about rendering.
PDF version of my power point Lecture: Intro To Particle Dynamics here.
The PDF for the in class exercise (Swinging Pendulum) on Pops in Dops updated to H13 is here. If you are stuck, a H13.0.237 hip file is also available.
TIP: Missing the details view from old pops? You can view it in the particle import node, or you can view it in the dop by right clicking on the node and selecting spreadsheet. It is now called the Geometry Spreadsheet.
TIP: Pop Color does work, however when you are rendering particles with no lights added, the default headlights are on and they will appear to be white. Put some lights in your scene (I suggest sky/sun) and you will see the color.
TIP: In order to render instanced geometry, you must append an Instance SOP after the DOP I/O node inside the renderable object.