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if you are using indirect illumination, then i usually change the irradiance map pressets to high for final render and low for preview render
be sure tthat hsph subdiv is at maximum 50, this value also improves greatly your rendering time, for preview render choose only 8
then in advanced irradiance map pressets for interpolation type choose delone triangulation and for sample lookup choose precalc s overlapping, this will make you very very nice looking shadows
and you can always save your irradiance map for that one camera view, so save and then load it, but this works only for a camera view, for other you should render it again with single frame and then save it, this greatly improves your rednering time, if you are trying to test materials
image sampler: i usually change to adaptive subdivision and then in min rate i choose 1 and max 2, but for preview rendering is 0 to 0 fine
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