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Fluid Effects
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Autodesk® Maya® 2008
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Table of Contents
1 Introducing Maya Fluid Effects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
About
Fluid Effects overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Types of fluids. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Dynamic fluid effects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Non-dynamic fluid effects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Oceans and Ponds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Getting started with Fluid Effects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Fluid examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Fluid tutorials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2 Creating Fluid Effects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
About
What are the components of a fluid? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Fluid containers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Fluid emitters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Container contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Combining fluid properties to create dynamic effects . . . . . . . . . . . . . . . . . 20
Defining the contents of a fluid container . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Preset gradients . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Grids . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Fluid examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
How do I?
Import Fluid examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Create dynamic fluid effects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Create non-dynamic fluid effects. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Create fluid containers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Changing the container boundary display. . . . . . . . . . . . . . . . . . . . . . . . . . 26
Add properties to fluid containers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Add properties as predefined gradients . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Emit fluid properties into grids . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Create a fluid container with a fluid emitter . . . . . . . . . . . . . . . . . . . . . . . . 28
Add fluid emitters to containers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Paint fluid properties into grids . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Paint in a 2D container . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Paint in a 3D container . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Fluids
3
Table of Contents
Flood a container with values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Paint during playback. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Map values to container voxels. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Display painted values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Reset the Paint Fluids Tool. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Undo paint strokes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Paint Fluids Tool settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Add color to fluids . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Color fluids using shading color . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Color fluids using grids . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Display fluid container contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Display subvolumes of 3D containers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Emit fluids from objects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Set Contents with Curve. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Add predefined initial states to fluid containers . . . . . . . . . . . . . . . . . . . . . . . 42
3 Modifying fluids . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
About
Modifying fluids . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Changing fluid container size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Changing container dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Scaling containers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Extending container boundaries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Change fluid resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
How do I?
Change the size of a fluid container . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Change the resolution of a fluid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Change dynamic fluid behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Using fluid Velocity as a force. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Change fluid behavior at the container boundaries . . . . . . . . . . . . . . . . . . . . . 48
Define an arbitrary falloff region for fluid containers . . . . . . . . . . . . . . . . . . . . 49
Convert fluids to polygons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Modify fluid attributes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Use fluid attribute presets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Fluids
4
Table of Contents
4 Object interaction with dynamic fluids . . . . . . . . . . . . . . . . . . . . . . . . . . . .53
About
Object interaction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
How do I?
Make fluids collide with geometry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Disable a collision effect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Move geometry with the force of a fluid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Move cloth with the force of a fluid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Move particles with the force of a fluid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Modify geometry with the force of a fluid . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Work with motion fields . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Create motion field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Workflow. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
5 Playing fluids . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .61
About
Fluids playback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Related topics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Fluids initial state . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Related topics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Caching fluids . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Single file fluids cache . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
One File per Frame (OFpF) fluids cache . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Segmented fluids cache. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
How do I?
Set the initial state of a fluid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Delete the initial state of a fluid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Save the current state of a fluid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Delete the initial state of a fluid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Save the current state of a fluid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Create fluids cache files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Create a One Frame per File fluids cache . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Append cache files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Delete and truncate cache files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Load cache files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Replace the fluids cache at the current frame . . . . . . . . . . . . . . . . . . . . . . . . 72
Fluids
5
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