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InTool Scripts
InTool scripts are special scripts that run on the tool during evaluation of each frame, at the start of the render or at the end. They are defined directly within the tool and have read access to a limited set of data through the input’s name—self, composition or comp, and fusion or fu. The limitation is supposed to prevent infinite loops, race conditions, and performance problems.
For example, you cannot call or change Inputs. If you want change Inputs based on a logic, use modifiers, expressions, or simple expressions. Also note that changing most of the Inputs in a tool will trigger a re-rendering and therefore the InTool Frame Render Script is evaluated again.
