POV-Ray : Newsgroups : povray.general : Strange cuts on rendered objects - thread Feb 03, 2020. Update. Server Time
25 May 2022 06:48:34 EDT (-0400)
  Strange cuts on rendered objects - thread Feb 03, 2020. Update. (Message 1 to 1 of 1)  
From: William F Pokorny
Subject: Strange cuts on rendered objects - thread Feb 03, 2020. Update.
Date: 7 Feb 2022 19:34:57
Message: <6201bab1$1@news.povray.org>
A followup.

Two years ago there was a "Strange cuts on rendered objects" thread in 
this forum, where the objects were satellites in orbit as view from the 
surface.

Reference:

Message: <web.5e38381eb3cfd5d4c30604810@news.povray.org>

http://news.povray.org/povray.general/thread/%3Cweb.5e38381eb3cfd5d4c30604810%40news.povray.org%3E/

At the time, the work around employed was povr's -mb v3.6 restoration 
fix. A working -mb bypassed all object bounding and depended instead on 
the mesh's internal bounding.

The original problem was thought to be due the use of floats over 
doubles in our bounding code - especially given the large scene dimensions.

I've confirmed using doubles for bounding fixes the original numerical 
accuracy issue for both bounding methods 1 & 2. The current povr branch 
code has moved bounding to doubles(a).

(a) Using all doubles for performance more than accuracy (related to 
Github issue #363).

Aside: We have still have an issue where older, pre server crash, news 
articles are not on the news server. Access via thunderbird is then 
impossible. Hence, the brand new thread for the followup.

Bill P.


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