I have a cave, and I want to make the roof drip. I've made a dripping rock that goes on the ceiling and releases a drop particle every so often. Now I want a rock that emits drops from a random position in a plane, so that I can get all my drips from one big invisible prim.
I found that if I use anything but PSYS_SRC_PATTERN_EXPLODE, the drips come from one spot in the center of the horizontal plane. Increasing the burst radius just moves the spot vertically.
If I use EXPLODE, I get pretty close to what I want, but increasing the radius affects the z plane as well as the xy plane. How can I get the drops to emit from a random point on the horizontal plane?
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Oh never mind! I'm an idiot! Of course I soon as I hit enter it occurs to me. I had PSYS_SRC_ANGLE_BEGIN and _END both set to PI. Setting one to 0.0 did the trick.