Image Variables

These are variables carried by each node.

Allows you to access a value at a different frame. For example:

Blur1.xPixel@@(time-3) looks at the value from 3 frames earlier.

Returns the name of the actual file being used for the current frame. Useful when plugged into a Text node:

{FileIn1._curImageName}

In-Node Variables

These are channel variables used in nodes such as ColorX, LayerX, Reorder, etc. Check the documentation for specific support of any variable.

if (expression evaluates to non-zero) { 
       do_this 
} else if { 
       do_this 
} else if { 
       do_this 
} else { 
       do_this 
}

If/Else

Used to express decisions. If the test expression is true, then the first statement is executed. If false (and if an "else" part exists), then the second statement is executed. If "else" is left off, Shake does nothing and moves on.

for (initialize; test; increment) 
{ 
    do_this 
}

For

Normally, the three expressions of the "for" loop are an initialization (a=1), a relational test (a<10), and an increment (a++): for (a=1; a<10; a++). So "a" is set to one, checked if it is less than 10, then if that is true, a statement performed, and "a" is incremented by one. The test is checked again and this cycle continues until "a" is found to be not less than 10 (untrue).

while (this_expression_is_true) 
{ 
    do_this 
}

While

If the given expression is true or non-zero, the following statements are performed, and the expression is reevaluated. The cycle continues until the expression becomes false. If there is no initialization or re-initialization, "while" often makes more sense than "for".

do { 
  do_this 
} while (this_expression_is_true);

Do/While

This variation of "while" is different in that it tests at the bottom of the loop, so the statement body is done at least once. In the "while" above, the test may be false the first time and so nothing is done. Note on all of the other statements, a semicolon was not needed. This expression does need it at the end.

Noise Functions

These are ideal for WarpX and ColorX.

Since you basically can write books on this, here is an example. Otherwise, it is recommended to purchase a book on C. There are also several examples under the Scripts documentation. This example takes the scriptName parameter and uses the system function echo to print it:

extern "C" int system(const char*);
const char *z= stringf("echo %s",scriptName);
system(z);

strsub(
const char *string,
int offset,
int length
)

Curve Functions

The curve functions with implicit time (Linear, CSpline, etc.) all assume that time is the first argument, so the following statements are identical:

LinearV(time,0,1@1,20@20)
Linear(0,1@1,20@20)

You can, however, adjust the time value explictly with the V version of each curve type.

These are the cycle type codes:

0 = KeepValue
1 = KeepSlope
2 = RepeatValue
3 = MirrorValue

JSplineV(time_value, cycle, value@key1,
value@key2,
...)

Hermite(cycle,
[value,tangent1,tangent2]@key1,
[value,tangent1,tangent2]@key2,
...)