The Persistence of Vision Raytracer (POV-Ray).

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Attached to Project: POV-Ray
Opened by Michael Lindig - 2010-03-04
Last edited by William F Pokorny - 2017-01-19

FS#79 - Full-Featured Test-Scene to check the correctness of povray


it would be nice if there exists a test scene (not a benchmark) which has a high coverage of povray source and can be used as correctness validation of povray. It schould be produce an image which can be compared to a golden reference image.

It may be also possible to create a regression test suite which does automatic comparision of the render results.

Grimbert Jérôme commented on Thursday, 11 March 2010, 21:44 GMT

Looks to me the "all image" & "all animation" scripts (as well as the portfolio) might cover the topic.

It's not a single image, and due to png compression (as well as changing features), it's not possible to automat the comparaison. (yet ?)

Using the right combination of imagemagick, it might be possible to check for a global "black" difference.

Moreover, povray never says that anti-aliasing was determinist amongst different computers
(and aliased pictures are just horrible to look, but might be good for non-regression checks)

Christoph Lipka commented on Monday, 22 March 2010, 22:20 GMT

I'm already doing performance comparisons of the current 3.7 betas or my development versions against earlier betas as well as 3.6 (on a Linux machine), using a suite of ~151 images at present, and also occasionally check the output images; while I initially did that manually using BeyondCompare, I have by now written a small command line program to read in two PNG images, compare them, output two images showing (a) a (contrast-boosted) difference image and (b) a greyscale version with differences highlighted, and ultimately returning an exit code identifying how severe the differences are (according to some rather simple heuristics). If someone is interested, I might publish the code for that tool in one of the newsgroups.

Simon commented on Sunday, 24 February 2013, 17:37 GMT

imagemagick suite comes with "compare" tool that does exaclty this. It also generates a lot of different measures of difference between images, which gives you numbers to compare.

William F Pokorny commented on Thursday, 19 January 2017, 14:42 GMT

Now tracked on github as issue #192.


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