Learn about creating 2d particles that emulate rain.
- [Instructor] We're going to start working with simulation now. When I say simulation, I mean a particle system. Force effects include several particle effects. The particles are a complex system that emulates laws of physics with a large group of small items like particles. Particles are great for simulating things like rain, snow, water, sparks, fireworks, and so on. So here I brought back my shovel scene. This is one where I track the sign on the side. We're going to use this to add rain.
And rain is a very simple particle system. It works pretty quickly, so it's a good place to start. This is saved out as six one. We're going to select the shovel layer, go to effect, and go to the particles menu. In here are the Boris particle effects. Some of these recreate very specific events, like snow, sparks, or rain. Some of these are more generic that create more complex systems that you have to adjust. Let's just start with rain. As soon as I add it, rain appears.
If you look closely, you can see the rain streaks in front of the shovel. There are a number of properties you can adjust to affect the rain. Now it is animated by default. And that's the beauty of a particle system. All these little particles, these little streaks, are generated semi-randomly and go through their own set of reactions to physics, for example, built-in gravity. Looks pretty good to start with. Let's look at some of the properties though.
There's the amount of rain, you can make the rain denser, let's say a hundred. The angle at which it falls, I like 15. The speed of the rain can make it fall faster, stronger gravity, or weaker. Let's try 300 in the depth. Depth is the relative distance between the rain and the camera. So you can make it look like it's closer or farther away.
I'm going to leave that at 200. The amount of blur, can blur it so it's barely there. And I like a little heavier blur, so let's say 1.5. And you also have some controls for the actual raindrops themselves, the particles, including the color. Though I'm want to leave mine white. You can also have the color taken from a source layer, such as the shovel layer. This turns the rain very brown in the sky though, so I'm going to turn that off.
So I'll see opacity. I don't like mine so opaque, I'm going to turn mine down to 15. I feel I should barely see it in the sky. Also, a relative size for the rain drops. So I increase that and you can see that they get longer and more opaque-appearing. Leave it at zero. And then at brightness variance, I'm going to move that closer to zero so they're more difficult to see in the sky.
If you have a lower negative number, in other words, say, negative 50 or negative 75, they become more apparent against the sky. Some of them become darker. So let's say negative 25 there. So with a static frame, I should barely be able to see the raindrops, I think that looks more realistic. However, you can tell right there when it starts to play back. Now in terms of some of the particle generation properties, those are in the system, including the lifespan of the particles, how long they live before they die, the width of the generation, so the virtual admitter, how wide it is compared to the screen, and variance.
Properties for variance in speed and variance in direction. So if you want it more random, you can turn up any of the variance properties. For this though, I think it looks pretty good just for the default settings, so we'll skip that for now. We'll get back to more physical settings, or more settings that affect the way the particles are moving in later videos.
VFX expert Lee Lanier begins by exploring shared Boris Continuum controls, and then shows how to apply stylistic effects. He explains how to work with the PixelChooser and Boris Lights, and discusses how to color grade and warp footage. He also takes you through using the Boris Chroma Key Studio and working with Mocha Pro for motion tracking, as well as how to add particles and work with 3D text.
- Overview of Boris Continuum
- After Effects preferences
- Applying stylistic effects
- Relighting with Boris Lights
- Adjusting colors
- Changing the time of day
- Warping footage
- Keying green screen
- Motion tracking
- Adding particles
- Working with 3D text