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21 November 2005 26,965 views No Comment



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).

The tool does no extra processing on the input. It simply passes the data to the output as a color (regardless of input type). The Histogram tool can therefore be inserted at any point in a render tree and not affect the result.

As an added bonus, since the display application is written as a COM automation server, it can also be called from your own scripts to display your own information. In the installation directory, there is an example that illustrates how to do this (in both VBScript and JScript).

You can find the download link at the bottom of the last page.

On page 3, I’ve included a tutorial to show how to use Histogram, and to take you through the various features.

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