Maya Particle Effects
Illustration by John Hersey

Randomizing paint effects


From:

Maya Particle Effects

with Audri Phillips

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Video: Randomizing paint effects

Hello! In this little section, we are going to show how to instance paint effects to particles and yet have the paint effects all appear at their own distinct size or own random size. So for example you could have some flowers and they could all be instanced and they could all be a different size. So for the first thing we, of course, will want to create some new particles and when I just make a little particle grid in our top window and then I am going to prepare these particles as well. I am going to give them a new attribute. Under General, I am going to have to hit the New tab here and I am going to give them a new customScale attribute.
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Watch the Online Video Course Maya Particle Effects
2h 8m Intermediate Jun 11, 2009

Viewers: in countries Watching now:

Particle effects can be used to create everything from realistic smoke and light to abstract design elements. In Maya Particle Effects, Audri Phillips demonstrates the particles she has found helpful in her work creating dynamic visuals for video games,film and fine art. This course goes deeper than the basics, tackling topics like saving time by reusing MEL expressions, implementing physics to create realistic effects, and manipulating paint effects to give particles the look and feel of an envisioned design. Exercise files accompany the course.

Topics include:
  • Working with particle emitters and fields
  • Instancing paint effects and geometry to particles
  • Using Maya particles to produce graphic design elements
  • Using the relationship editor, creating particle collisions and collision events
  • Creating realistic effects such as smoke by emulating real life physics
  • Rendering and exporting final projects
Subject:
3D + Animation
Software:
Maya
Author:
Audri Phillips

Randomizing paint effects

Hello! In this little section, we are going to show how to instance paint effects to particles and yet have the paint effects all appear at their own distinct size or own random size. So for example you could have some flowers and they could all be instanced and they could all be a different size. So for the first thing we, of course, will want to create some new particles and when I just make a little particle grid in our top window and then I am going to prepare these particles as well. I am going to give them a new attribute. Under General, I am going to have to hit the New tab here and I am going to give them a new customScale attribute.

I want it to be set to Vector because there is going to be an X, Y and Z value to it. It's a Per particle array and Add initial state and I am just going to go Add and there it appears and I am going to put an expression in there, a Creation Expression. Ctrl+C, Ctrl+V. Since it's a vector expression, I will have three values for X, Y and Z. Put my little arrows like that and I am going to randomize them.

So let's go like 0.1, 4, so I will randomize this one, 0.2, 0.9, and I will put a comma between that as well and randomize this last one. Let's say 1, 0.3, two little arrows again and I am going to Create and notice no red bar. I know I did it right. There it is, Result particleShape1. Take that away, so I have got an expression in there.

There will be -- as soon as I instance something to it -- there will be something I can do here. Under Scale : customScale, this will work. Okay, so now I am going to open my Window, my Paint Effects window and I am going to choose a brush. Once again, I am going to choose some little flowers and I am going to paint that flower in the scene, hit Enter, get rid of some of these windows. And now I am going to go into Particles > Instancer (Replacement) because I want to put that little flower on every single particle. The flower is selected, so there it is in the Instanced objects and the particleShape1 is what it's going to be instance 2. Under General options, I am going to make sure that the new attribute I made, customScale, is there. It could say None, etcetera, so you have to make sure that the new attribute you made is made.

I am going to hit Apply and there you have all my flowers, but they all look somewhat the same size and now they are different. There's not a lot of variation, but they are different. So let's try to make that expression on these particles even more different. Go down to that Custom Scale Expression, Creation Expression and randomize 1 through 9. So make this .2 through 3 and we are going to make that 19 and see what happens and I will go Edit and my flowers change all right and there is more of a random difference to my flowers.

So this is something that you can have fun with. Let's try a little render on that. So that when you instance, paint effects can come out at random sizes. So it's a little template that you can play around with. Have fun.

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