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Expressions
List of Mel commands
Go to Help->Maya Scripting Reference->MEL Command Reference
Add expressions to a channel
Select Object
Select the channel to add an expressionto in the Channel Box (ie. Translate Z)
Select Edit->Expressions from the Channel Box
Type in the code under Expression:
Hit Create or Edit
Wheels on a car apply to the wheel rotate in z channel
rz = car.tx / (2*3.1416) * 1 * 360
wheel car pi wheel size 1 rotation
You need an object named car for this to work. When car moves in the X axis the wheel spins in Z.
Windshield wipers apply to the wiper rotate in x channel
rx = (sin (.9 * time) * 45) + 10
wiper sine speed time degree offset for position
Volumetric squashing for a ball
apply to the ball scale in X channel sx = 1/sy
apply to the ball scale in Z channel sz = 1/sy
X and Z change when you move the object in the Y axis.
Start an Expression at a Certain Frame
output yes if frame is greater than 20, uses backward single quote (same key as "~")
$c = "no";
if (`currentTime -query` > 20) {
$c = "yes";
}
print $c;
Embedded Sin Waves for a Random Effect
ty = (sin(time)*(sin(time*.2)+.1))+1;
Use noise for a random effect
ty = noise(time);
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Set Driven Key
This is similar to expressions, except Maya writes the expression for you.
Go to the Animation section of Maya
Create two shapes
Key->Set Driven Key->Set...
Select the controller shape
Click Load Driver Button in Driven Key window
Select the other shape
Click Load Driven Button in Driven Key window
Select both shapes
Select the channels you would like to control
Driver Translate x
Driven Rotate x for example
Click key Button in Driven Key window, this establishes the neutral position
Translate, Rotate, etc. the two objects
Select both objects
Click key Button in Driven Key window, this establishes the neutral position
You could use this to create control handles for your IK skeleton
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