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From: | Markus Mützel |
Subject: | [Octave-bug-tracker] [bug #58956] Empty plot for certain xlim / ylim settings |
Date: | Mon, 7 Sep 2020 03:21:01 -0400 (EDT) |
User-agent: | Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.83 Safari/537.36 Edg/85.0.564.44 |
Follow-up Comment #11, bug #58956 (project octave): That might be far fetched: But most of OpenGL "is" single precision. The interface to glOrtho uses ´double´, but it might be that these values are cast to ´float´ somewhere for its calculations. Depending on where this conversion happens, it might be necessary that "nearVal" and "farVal" must be different in single precision to avoid a division by 0 (or something similar): >> single((1e+11 + 2.0) - (1e+11 - 2.0)) ans = 4 >> single(1e+11 + 2.0) - single(1e+11 - 2.0) ans = 0 >> single(1e+6 + 2.0) - single(1e+6 - 2.0) ans = 4 Maybe we should make sure that "nearVal" and "farVal" differ on the 23-bit mantissa of a single precision floating point number? _______________________________________________________ Reply to this item at: <https://savannah.gnu.org/bugs/?58956> _______________________________________________ Message sent via Savannah https://savannah.gnu.org/
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