opencsgtest_issue1215 and throwntogethertest_issue1215 fail for me because the expected results have Z fighting and my machine generates a different Z fighting pattern. opencsgtest_issue1165 has a very thin feature that causes Z fighting on my machine. How are these tests expected to work? Is Z fighting expected to be deterministic?

> On Apr 27, 2017, at 05:12, nop head <nop.head@gmail.com> wrote: > > opencsgtest_issue1215 and throwntogethertest_issue1215 fail for me because the expected results have Z fighting and my machine generates a different Z fighting pattern. > > opencsgtest_issue1165 has a very thin feature that causes Z fighting on my machine. > > How are these tests expected to work? Is Z fighting expected to be deterministic? > Z-fighting should be deterministic across GPUs from the same vendor where Z buffer size is the same. Across GPUs from different vendors it may change. ..and it definitely changes across drivers when software-rendering is involved We disable a bunch of tests, including the two you mention, when running tests on the CI, see https://github.com/openscad/openscad/blob/master/scripts/travis-ci.sh We may want to tag these tests using a named group in ctest to make enabling/disabling them more portable. -Marius