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So here we are again with our cute particles and we are going to try to tell our particles how to move in this movie. We are going to put a Vortex field on them and we are also going to change the rate that they are coming out of the emitter. So the first thing we do is we select our little particles and we go Fields. We have a selection of fields. We, however, are going to take the Vortex field. Open it up. It's says vort1 here because that's the last thing I named a Vortex field. I am going to accept the defaults, a Magnitude of 5. And it's going around the Y-axis on the vortex and I am going to hit Apply.
Now if I play the particles, you can see that they are coming up and rotating around the Y-axis. I, however, would like to change the speed at which they are doing that. So at frame 200, I am going to make them Magnitude of 5. So I'll right click over this and I'll say Set Key and then at frame 300, I'm going to make them a Magnitude of 7 and hit Enter. And then I am going to set the key.
Now if I go into my Window, my Animation Editors > Graph Editor. And go View > Frame Selection, there it is and I can see okay, here at frame 200 I have a Magnitude of 5 and here at frame 300 I have a Magnitude of 7. So I am happy! Now notice if I scrub through my frames, usually anyway, I get some kind of pink warning down there that says it's not--- aw, when you want a pink warning...
Ah, there it is. It will only not give you the warning if several things are happening. One, your preferences are on Playback speed : Play every frame. And you are just using your controls to play through your particles using your controls like this, right. Then it would be happy and you would see that pink warning. But if you start just changing numbers randomly like this, right, you are going to get a little warning. Or if you start scrubbing though, you are going to get a warning. However, if you play them back, like this, you won't. Okay.
Then next thing I want to change on my particles is the emitter. How many of them are coming out of the emitter? So under my Plane, I have the emit11. It looks like I named it. And it's my surface emitter and let's see. At frame 1, I want my particles to be coming out at a rate of 50 particles per second. So let's go 50, hit Enter and I am going to right-click and go Set Key. Then I am going to go frame 75 and notice my little pink warning there again because I am not playing it with the VCR players right here. And at frame 75, I am going make it 200. I am going to hit Enter and then I am going to right-click and go Set Key. And at frame 120, I want it to be holding at the same rate there. So I am also going to set the key at 120. And then when I get to frame 175, I want it to cease to emit so I will put 0 at frame 175 and I will right-click and I will go Set Key.
Let's see what we have got. And there go my particles and they are going to stop being emitted at frame 175. Very nice. Just what I wanted it to do. So in the next movie, we are going to create a second emitter and a second set of particles.
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