![]() Also, for most intensive GPU tasks, you need at least a CPU thread "open" to feed data back and forth the GPU efficiently, thus occupying the CPU with something else to 100%, might even be counter-productive. Instead of calculating bouches in a handful of CPU threads, you get to calculate one bounce per shader (or something like that) on each cycle of the clock, so if you are throwing thousands of shaders to the task, you can achieve decent rendering speeds - so much faster than the CPU (in the same task) that there is no merit in combining the CPU in this "loop".it will just "burn" electricity. The massive parallelism built into the 100s or 1000s of simple compute units (aka CUDA cores, shaders, etc) in GPUs is very efficient in calculating these exact small problems. These techniques are characterizing a rendering engine as "biased", as it doesn't independently calculate each and every pixel on the final frame, but "cheats" through interpolating results. Irradiance mapping is such a technique) that allow for faster rendering times. ![]() Rendering engines, utilize certain "shortcuts", involving in a nutshell grouping neighboring pixels and interpolating (e.g. Calculating hundreds of thousands or millions of bounces with 8 or 12 or 24 (depending on the threads your CPU(s) have) threads is tedious and takes lots of time. These very small "problems", are a waste for the long, complicated compute threads of modern CPUs: the CPU is "done" with it very fast, but it has to wait for the next problem in queue to come up. It is an "unbiased" method that uses brute force to literary calculate ray by ray and bounce per bounce of light for the whole GI solution. VRay RT GPU, is another rendering method, different and not 100% compatible with all the features of Vray Advanced (yet). The fact that machines labeled as "workstations" marketed to people "rendering stuff" come options that contain "workstation" GPUs, mainly Quadros & Firepros have nothing to do with "rendering" itself.ΔΆ. Will make virtually no difference rendering something on a workstation with "on-board" graphics/IGP, GTX 780, GT 610, Radeon 7750 or any Quadro. ![]() ![]() It will get there, but it is not right now. The GPU is not used for any aspect of "normal" renders with VRay advanced, Mental Ray or any other traditional renderer. ![]()
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