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PTM Viewer Description

Polynomial texture mapping (PTM) viewer

Polynomial Texture Maps (PTMs) are a simple representation for images of functions instead of just images of color values. In an conventional image, each pixel contains static red, green, blue values. In a PTM, each pixel contains a simple function that specifies the red, green, blue, values of that pixel as a function of two independent parameters, lu and lv.

Typically, PTMs are used for displaying the appearance of an object under varying lighting direction, and lu,lv specify the direction of a point light source. However, other applications are possible, such as controlling focus of a scene. PTMs can be used as light-dependent texture maps for 3D rendering, but typically are just viewed as ‘adjustable images’.

PTMs are typically produced with a digital camera by photographing an object multiple times with lighting direction varying between images. Even a low-end digital camera provides enough resolution to produce good PTMs, and almost any light source can be used such as a light bulb, LED or flash.

Instructions:

Simply unzip the file into a directory and run the executable, either from the command line supplying the filename of one of the included data sets (ending in .ptm), or from explorer by dragging one of the PTM files onto the PtmViewer.exe application. The objects in the tablet1.ptm, tablet2.ptm and ushabti.ptm datasets are artifacts belonging to the Archaeological Research Collection of the University of Southern California. Copy the file glut32.dll to your Windows directory. Start PTM Viewer by dragging a PTM file onto the PTM Viewer application.

For instructions in the viewer, either select help from the menu accessible with the right mouse button, or press F1. Some functionality requires a middle mouse button. If you do not have a middle mouse button you may emulate it by holding down the shift key and using the left mouse button. Most of the functionality described in the paper is accessible using the menu activated with the right mouse button.

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