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Newsgroups: comp.graphics.rendering.raytracing
From: Jon Harrop <use...@jdh30.plus.com>
Date: Tue, 10 May 2005 04:52:38 +0100
Local: Tues 10 May 2005 04:52
Subject: Re: Mini ray tracer
asamard...@matf.bg.ac.yu wrote: Double precision. > Great work. What is default floating point type used by OCaml > compiler? > I got running time of about 36s for scene level 3 on I agree that single precision is usually good enough for ray tracing. > Pentium3 machine and running time of about 25s when all references to > "double" type in C++ code changed to "float" (and float is usually > "good enough" for ray tracing)... However, when I tried the same optimisation I found that it made the program much faster on 32-bit x86 and much slower on 64-bit AMD64. I assume this is a float alignment issue. Also, it generates (numerically) different results, which makes it trickier -- You must Sign in before you can post messages.
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