Is there a recommended approach for using Intel chips for volume rendering? The ispc distribution has a volume render example and embree has fast ray tracing, but they currently seem to be on separate paths.
I'm not sure I understand the context of question. Are you referring to coding technique or compiler command-line options for best optimization? For Intel Compiler options, I would recommend using the O3 switch and the proper instruction setswitch to enable architecture specific SSE instructions (/QxAVX, SSE4.2, SSSE3, SSE3, SSE2).
hmm.. apologies for not replying earlier, but I didn't receive an email notification of your reply because I missed the "subscribed" checkbox.
I'm not referring to compiler optimizations.. I think you need SSE to be competitive with GPU implementations. "Full-Resolution Interactive CPU Volume Rendering with Coherent BVH Traversal" seems to show that an 8 core CPU is comparable to an older GPU for 500x500x500 volumes, and my limited experience is that GPUs are currently rarer and more expensive than CPUs in clouds. So i'm interested in publicly available CPU implementations and was simply curious to know whether there is a currently recommended approach. For now I'll try ispc on some sample datasets and see if it is fast enough.
core CPU is comparable to an older GPU for 500x500x500 volumes
accurate would be to say from 500x500x500 and up.... CPU VR has a way
better scalability so with bigger volumes its advantage goes up; the
same true for rendering quality -> with higher sampling rate CPU
advantage goes up (it stands true for latest GPU vs latest Intel CPU as well). The combination of both: [bigger size + higher
rendering quality] makes GPU look hopelessly lost. The MIC
architecture is the platform where CPU VR development will gain a
on some sample datasets and see if it is fast enough.
it is definitelynot a good example...
volume-ray-casting design to CPU via ispc
will likely demonstrate a quite mediocre performance. The rendering
algorithms must be designed from ground up for flexible MIMD machine
what multi-core CPU in fact is. Some SIMD optimizations definitely may speed-up the math (to compute faster lighting, interpolations etc...) but it is complementary and it does not
effect the design scalability.
There is no good public CPU VR
at this point (at my knowledge; btw, I would love to find such).