tonemapping in pbrt2

[Patrick Walz]

i noticed that there is no tonemapping support in pbrt2 -- as pbrt had
various different tonemapping techniques i was wondering what pbrt2
does to its output

[Matt Pharr]

We took it out for a few reasons:

1. We cut coverage of tone mapping from the second edition of the book (needed to free up space for new content, also there are good books on HDR/tone mapping now.)

2. There are quite a few good toolkits with tone mapping algorithm implementations now--much better than those in pbrt-v1. For example: http://pfstools.sourceforge.net/ and http://scanline.ca/exrtools/.

So pbrt either writes out un-tonemapped HDR EXR files (like in pbrt-v1, where the tone mapping pipeline was only used by the exrtotiff program that accompanied pbrt), or clamped TGA files. The implementation of exrtotiff.cpp in the pbrt-v2 distribution does include an implementation of Reinhard's tone mapping function and the bloom code from pbrt-v1.

Thanks,
-matt

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