Substance Designer is dynamically generating built-in variables that you can call and use in your functions.
How to call a built-in variable ?
When you create a "Get" variable, all the built-in variables that correspond to the get node type will appear in the Variables drop-down list.
System Variables list
The built-in variables always begin with a Dollar symbol ("$"), and are as follows:
This variable returns the time in seconds since the Substance rendering engine was started.
It is ideal for Substances which need to animate according to time. (E.g. the hands of a clock.)
In some applications, including Substance Player, a Substance that uses $time will cause a timeline to appear in the user interface.
|$depth||-||float1||Returns the octave (level) number of the FX-Map node. This allows a node to modify its behavior according to which level in the quad-tree it represents.|
|$depthpow2||-||float1||As above, but returns 2 raised to the power of the octave (level) number. This is a helper value that comes in useful for some common calculations.|
Returns the number of the drawn pattern. This can be accessed by Dynamic Function graphs controlling an Iterate node to modify its behavior at each iteration step. (Note that $number starts counting from 0, not 1.)
|$size||-||float2||Returns the size of the current node (in pixels).|
|$sizelog2||-||float2||As above, but returns the size as power-of-2 values (ex: for 2048*2048 image, $sizelog2 returns 11).|
|$pos||Pixel Processor and Quadrant Nodes only||float2||Returns the birth position of the pattern. The result is always a value between 0 and 1.|
Returns the Node current tiling mode:
0: Relative to input