Search found 47 matches

by szellmann
Thu Jun 25, 2015 6:12 am
Forum: General Development
Topic: Ideas request for a specific raytracing application
Replies: 28
Views: 15084

Re: Ideas request for a specific raytracing application

Some of the technical layers, are compositions (CSG) of other layers (subtraction) (adds tesselation complexity == +triangles) Independent of shading, but if you can make sure all primitives can somehow be described by quadrics, you can just do away with tesselation completely and ray trace the CSG...
by szellmann
Wed Jun 10, 2015 8:17 pm
Forum: General Development
Topic: Float versus double
Replies: 12
Views: 11614

Re: Float versus double

Being able to switch this, e.g. using a typedef at a global scope, may in general be a good idea. That said, I never experienced precision issues that rectified using double, I could always work around them, e.g. using an additional Newton-Raphson step for sqrt(), etc. With lots of matrix mults, may...
by szellmann
Thu May 28, 2015 8:56 am
Forum: General Development
Topic: CPU (real time) raytracing references and articles?
Replies: 8
Views: 6289

Re: CPU (real time) raytracing references and articles?

Well, I guess a dual socket 16 core Xeon E5-2680 is far more expansive than a single GTX Titan (even including the price of some kind of host CPU). Right, and to be fair one would actually have to compare with two Titans. It's only that I cannot confirm the 10x plus speedups you see on some GPU ven...
by szellmann
Wed May 27, 2015 1:52 pm
Forum: General Development
Topic: CPU (real time) raytracing references and articles?
Replies: 8
Views: 6289

Re: CPU (real time) raytracing references and articles?

I do not agree that GPU ray tracing can (in general) outperform the CPU by orders of magnitude. At least not, if the scene geometry doesn't entirely fit into the caches of the GPU's streaming multiprocessors. With Visionaray ( https://github.com/szellmann/visionaray ) you can run the same C++ ray tr...
by szellmann
Sat Mar 21, 2015 12:47 pm
Forum: Tools, Demos & Sources
Topic: Visionaray Ray Tracing Framework
Replies: 11
Views: 22473

Visionaray Ray Tracing Framework

Hi there, I'd like to take this opportunity to advertise Visionaray, which is (yet another) ray tracing framework. https://github.com/szellmann/visionaray https://github.com/szellmann/visionaray/wiki Visionaray is based on generic programming with C++. In contrast to other frameworks, its main goal ...
by szellmann
Wed Jan 07, 2015 11:40 am
Forum: General Development
Topic: mrays/s
Replies: 4
Views: 3368

Re: mrays/s

So you basically find the metric impractical but for the "local" case. Those slides (https://software.intel.com/sites/default/files/managed/b8/3f/Embree_pt_1_Building_Ray_Tracing_apps_woop.pdf) e.g. compare Embree and OptiX based on mrays/s. I wonder how much faith one should put in those ...
by szellmann
Tue Jan 06, 2015 10:04 pm
Forum: General Development
Topic: mrays/s
Replies: 4
Views: 3368

mrays/s

Hi there, first of all: great board - thanks a lot. I wonder what you think is a fair way to evaluate the mrays/s metric you find in many publications. Basically, what I would expect is an atomic counter somehow associated with the BVH/accelerator, and then measure wall-clock time. But then, when I ...

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