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Using the object allows for mapping of textures and matrices to an output window by repositioning the window corners - essentially a software keystoning mechanism. This can be useful in basic projection mapping, when projecting from odd angles, or when keystoning is inadequate. Tutorials Tips and Workarounds

When creating OpenGL scenes that need to be software keystoned before final output, you can render the scene to a and send the entire thing into before passing it on to the final render window. This simple patch by forum user DigitalFX does a good job of demonstrating this technique:

-- Pasted Max Patch, click to expand. --

Third-Party Max externals similar to the object

VPT (Video Projection Tool) is a free, multi-purpose video projection mapping tool by HC Gilje. listing for the object

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