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§ 16.69.5 - Advanced Concepts for Transition Control Files
F/x's transition generator can use a built-in mathematical expression evaluator.
In order to use this, the evaluator must be passed:
- An exclamation point (!) to begin the expression, adding this escape character is the only way an expression can be evaluated.
-
Valid characters:
- Parentheses: ) and (
- Division and Multiplication: / and *
- Addition and Subtraction: + and -
- Power: ^
- Modulus: %
- Valid functions: (described below)
- The proper syntax when calling the time variable
- A properly formatted mathematical function.
- NO SPACES. A space designates that the argument is complete to the evaluator.
Note:
The variable called by "ttime(0)" returns the "current time". In a timeline, this returns the percentage of the timeline completed or the time value for a still. (The current time value will be in the form of 0.0 to 1.0)
The expression evaluator will accept these functions:
| Function | Details |
|---|---|
| abs(expression) | Absolute Value |
| acos(expression) | Arc-Cosine |
| asin(expression) | Arc-Sine |
| atan(expression) | Arc-Tangent |
| ceil(expression) | Ceiling (nearest whole number > expression) |
| cframe(0) | Returns current frame as number 1 to tframes() |
| cos(expression) | Cosine |
| cosh(expression) | Hyperbolic Cosine |
| deg(expression) | Converts radians to degrees |
| exp(expression) | Exponential |
| floor(expression) | Floor (nearest whole number < expression) |
| hyp(expression,expression) | Hypotenuse of X, Y |
| linv(expression) | Takes frame number as parameter, returns linear value 0 to (tframes(0)) as 0-1 |
| log(expression) | Natural Log |
| log10(expression) | Log, base 10 |
| loopv(expression) | Takes frame number as parameter, returns linear value 0 to (tframes(0)+1) as 0-1 |
| rad(expression) | Converts degrees to radians |
| sin(expression) | Sine |
| sinh(expression) | Hyperbolic Sine |
| sqrt(expression) | Square Root |
| tan(expression) | Tangent |
| tanh(expression) | Hyperbolic Tangent |
| tframes(0) | Returns total number of frames in the sequence |
| ttime(0) | Returns the current value for time in the range 0 to one. |
An example using the expression evaluator
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