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Taut is a C++ modelling operator for straightening edges. It features an intelligent algorithm that searches your current selection for distinct lines, which allows multiple edges to be straightened at once. It also features three modes of operation that provide different ways of distributing the vertices along the lines.
This tool lets you get a bit more insight into what is happening under the hood of XSI’s rendertree. Using it as a intermediate node, it will display all the data that passes through it in a way similar to how Photoshop Levels is shown. It will also show you the number of times the shader has been evaluated, as well as displaying the minimum and maximum range (which is dead handy for setting up commonly used nodes such as Change Range and Gradient Mixer).