Maya Dynamics Basics document provides an overview of using MEL (Maya Embedded Language) and expressions in Maya. It discusses the basics of MEL including how Maya uses MEL, the script editor, MEL commands, variables and return values. It also covers the basics of expressions including creating expressions and controlling attributes. Examples provided include creating random colored particles with an expression and controlling the orbit of the moon around the earth. Helpful resources for learning more about MEL and expressions include books, Autodesk's area website and other tutorial websites.
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We are going to see different things about programming in Maya:
- Introduction
- What is MEL?
- Maya API - Python
- Python versus MEL
- Interaction with Maya
- Why PyMel?
- An Intro to PyMEL Objects in Maya
- Help
- References
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Mule Expression Language (MEL) is a separate expression Language used by Mule ESB to alter the Business data or read the metadata of Business data. Using MEL we can even alter the data.
The Unified Modeling Language (UML) has arguably succeeded in becoming the most commonly used modeling notation for software development. But “modeling” in the software community seems largely to mean simply drawing pictures, either to represent the problem domain or to blueprint a solution, without a precise enough meaning to fully specify the functionality of the system being developed. As a result, the UML standard,S up to and including UML 2.4.1, do not define the semantics of UML models at all precisely.
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1 Overview Fluid Effect
What is Fluid Effect ?
What does fluid effects support ?
2 Working with Fluid Pond
Learning contents: Create Pond; Fluid Attributes; Pond Wake; Emission Turbulence;
Shader Attributes; Match Object; Interactive; Simulation Quality; Make Collision;
InitialState; Keyframe Emission; Keyframe Object; Raytraced Water, ...
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Create a virtual lab.
Session 10 – advanced goal & instanterTrí Bằng
1 Fantasy Particle (Advanced Goal)
What is Fantasy Particle ?
How to create a Fantasy Particle ?
2 Advanced Instanter
Some special particle instanter.
Create falling leaves.
1 Overview Particle Goal :
What is Particle Goal ?
What we can do with Particle Goal ?
2 Integrated with Particle Goal :
Create Integrated with Particle Goal.
Practical situations.
3 Exercise:
Create a virtual experiments.
1.The Particle Instanter :
What is Particle Instanter ?
What we can do with Particle Instanter ?
How to create a Particle Instanter ?
2 Integrated with Particle Instanter :
Create Integrated with Particle Instanter.
Practical situations.
3 Exercise:
Flying lanterns.
1. Create with Ram menterial:
What is Object Desintegration ?
How to create a Object Desintedgration with Ram
menterial ?
2 Create with nCloth:
What is nCloth ?
How to create a Object Desintedgration with nCloth?
1 Basics:
Shaders/Materials.
Working with color particle : color, expression, expression shader, ...
2 Texture :
Which type Particle, we can use texture ?
Create textures on Adobe Photoshop.
Apply textures to particles.
3 Examples:
Create a spacecraft flying in the sky stars.
1 Field:
What is field ? How to add dynamic field ?
Work with fields.
2 Collision effect:
What is collision effect ?
Make collide.
Make particle collision events.
3 Examples:
Creating waterfalls.
Rain on car.
1 Basics:
What is Emitters ?
Emitter Tool.
Working with type Emitters: omni, directional and volume.
Create Emitters from Object.
2 Examples:
The spacecraft flight.
Open Water Tap.
1 Create and motion control Particles:
Create particle in different environments.
Parent an object to dynamic motion.
Set key particle.
Motion paths.
2 Examples:
Create a text effect.
Creating a simple virtual experiments.
1 Dynamics overview:
What we can do with Maya Dynamics ?
Architecture and Features.
What will we learn in this topic ?
2 Getting started with Particle Tool:
Started creating Particle with Particle Tool.
Understanding Particle objects: creating, display attributes, setting render,
render view, ...
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1. Maya Dynamics Basics
Lab 5: MEL and Expression
Author: Khieu Van Bang
Email: tribang.nd@gmail.com
2. CONTENTS
Basics:
Why using MEL & expressions?
Differences between MEL and expression.
What you can do by using MEL and Expression ?
MEL Basics:
How Maya Uses MEL.
Script Editor.
MEL Commands .
Variables .
Return Values.
Expression:
Create expression.
Helpful Resources.
3. 1) BASICS
1.1) What is MEL and Expressions?
1.2) Differences between MEL and Expression.
1.3) What you can do by using MEL and Expression ?
MEL and Expression
4. 1.1) What is MEL and Expressions?
1) MEL and Expression
MEL stands for Maya Embedded Language. MEL is a scripting language which can
embody "open architecture" of maya. By using MEL, user can control maya functions
directly/indirectly. Even maya's GUI (graphic user interface) can be controlled by MEL.
Therefore user can add new functions that maya doesn't have OR customize GUI as
their needs.
Expression controls attribute of object. User can control an animation which cannot
be key framed (e,g. particle). Using expression is similar to script MEL.
We will mainly learn how to work with Expression.
5. 1.2) Differences between MEL and Expression.
1) MEL and Expression
MEL Expression
MEL is more likely completely independent
programme.
Expression is a correlation with objects.
MEL needs complete structure of grammar. Expression needs only the least rules.
MEL is executed no matter animation is played
or not.
Expression is executed only while animation
playing.
MEL is saved separately with the scene. Expression is saved as a part of the scene.
MEL access to the attribute indirectly. Expression access to the attribute directly.
6. 1.3) What we can do by using MEL and Expression.
1) MEL and Expression
MEL : control an attribute of object accurately, create new macro, create new user
interface, customize maya GUI.
Expression : control attributes of object apart from key framing by numerical
expression, control attributes by conditions, It can use MEL command in expression.
However, it can't control the attribute that controlled by existing key, set driven key,
constraint, motion path or other expression. It can occur an error if you run MEL
commands such as connection/disconnection of attribute or creation/deletion of
object within the expression.
Grammar of MEL is very similar to other programming languages like C, C++. Not
only the MEL, most script based languages are descended from C. It is not essential
to learn programming language for MEL. Although if you have experience with
scripting language, it will be easier to understand the structure.
7. Do not worry !
1) MEL and Expression
o I know you are designers.
Expression is very easy to use.
10. 2.2) Script Editor
Top area displays the MEL that Maya just did.
Bottom area is a work area where you type code interactively.
Selecting text and hitting „ctrl + Enter‟ executes code.
Make a shelf button by selecting text and middle mouse dragging to the shelf.
2) MEL Basics
You get to it by hitting.
11. Structure:
<command name> -flags values;
Example 1:
sphere -radius 3;
Example 2:
polySphere -radius 2.5 -subdivisionsX 10
-subdivisionsY 30 -name "Rambo";
These flags are like the option box settings.
2) MEL Basics
2.3) MEL Commands
Variable type Default value
int 0
float 0.0
string ""
12. Modes :
Creation
-By default.
Edit
-Used to change values of an existing object.
Query
-Used to get a value from an existing object.
2) MEL Basics
2.3) MEL Commands
14. 2.4) Variables
- Are for storing data.
- Always start with a „$‟
- Data Types.
- Int (Stands for Integer)
4
- Float
7.259
- String
“Frito Chili Pie”
- Declaring a variable.
- int $theNumberAwesome = 42;
- Equals sign assigns a value to a variable.
2) MEL Basics
15. 2.5) Return Values
Are the result of running a command:
returnValue <command name> -flags values;
Use backquotes to store the return value/result of a
command in a variable:
int $variable = <command name> -flags values;
2) MEL Basics
21. What is Particle expression ?
3) Expression
Are more complex than other types of expressions. For example, we can write an
expression to control all particles in an object the same way, or you can control each
particle differently.
22. 3.1) Attributes Notes
3) Expression
1
2
Add dynamic attributes(Modify > Add Attribute)
o Control dynamic and custom attributes you add to a particle shape node.
o When we add a dynamic attribute to an object, the attribute names appear in the
Expression Editor’s Attributes list.
Per Particle (Array) Attributes
o Are created with Radius, Mass, Opacity,
Color, and Incandescence per-particle
ramps already added to the nParticleShape
node.
23. Step 1: Create a object.
o Example: Type "sphere" in command line and press enter. It will create a
new nurbs sphere.
Step 2: Change object attributes.
o Example: Change the name of the sphere in channel box as "Ball".
Step 3: Create expression.
o Select the ball. Go to Window > Animation Editor > Expression Editor,
run Expression Editor.
o Type in "ScaleBallWidth" in the box of Expression Name.
o Type "Ball.scaleX = Ball.scaleZ = time +1;" in the expression box.
3.1) Create expression
3) Expression
24. Step 4: Click "Create" and playback the animation.
3.1) Create expression
3) Expression
30. Books
Complete Maya Programming by
David A. D. Gould.
Websites
area.autodesk.com
fundza.com
ewertb.soundlinker.com
Helpful Resources.
MEL and Expression