Hi,
o7p9bxbnyj has left the following comment at Investigate and fix source of
rounding error
https://www.google-melange.com/gci/task/view/google/gci2014/5880145319559168:
Source of error
Much of this patch is still work from the earlier tasks to convert rt to
using the bundle generation functions, since I generally try to base my
patches off of a committed HEAD. The change from the previous patch is to
the way that the perspective angle fed into rt_gen_frustum() is calculated;
it has to be different from the original angle because of
rt_gen_frustum()'s closed-set behavior (see comment in source file). The
old method of calculating the new angle involved atan(tan(...)...), which
resulted in highly inaccurate results since trig functions are not
guaranteed to be particularly accurate; this change converts it to
eliminate the inner tan() call, which makes the error acceptable to the
current regression tests.
Greetings,
The Google Open Source Programs Team
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and fix source of rounding error.
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