ARCHITECTURAL EXTERIORS - RENDERING SPEED TIPS FOR V-RAY:
(some of those are quite obvious,
but I wanted to include all that I found useful;
those tips come from my own experience, so some
of them can be somehow wrong - please feel invited
to correct me / discuss / give your solutions..)
1. DON`T USE TOO MANY LIGHT BOUNCES
usually first diffuse bounce is enough, you may try with one more secondary bounce, but not more... (for simple building, without many carved - semi-interior spaces) [render options -> GI settings]
2. DON'T USE TOO HIGH IRRADIANCE SETTINGS FOR RENDERING HUGE IMAGES
for image size of ~3600 pixels use irradiance settings like: min/max=-4;-3 (="very low" preset) with interp. samples=25 (to make things more smooth), or for the "superb" quality min/max=-4;-2"
3. ALWAYS SAVE YOUR IRRADIANCE MAP
may be useful to re-use it, when you'll be making some alterations to the image (incremental add is also useful then)
4. IF YOU HAVE A LOT OF RAM
you can speed things up by tweaking the vray system raycaster params. go up to 85(max tree depth) and down to 0,5 (face/level coef). but if your rendering doesn`t fit in your physical RAM memory, and gets swapped to the hard drive - then it`s no good - you'll have to lower these settings to the default -> 60;2 or even lower values, like 50;4.
5. DON`T ANTIALIAS TOO MUCH
for a huge images (as 3600 pix) it`s a good choice to set antialiasing to adaptive -1;2 with a tolerance of ~0,12. however some say that when using lots of fuzzy effects (like area shadows and glossiness) antialiasing mode should be switched to a fixed value or simple two level. from my experience in arch. renderings the adaptive mode works best in any case.
6. DON`T USE TOO MANY REFLECTION/TRANSPARENCY LEVELS
make it 2-3 max. this in most cases is enough [render options -> global switches]
7. SWITCH OFF THE "REFLECT ON BACKSIDE" PARAMETER
it slows things down generally and doesn`t have a great impact on the final look [in material editor -> vraymap/vray material]
8. REMEMBER ABOUT INTERPOLATED GLOSSIES
they take some time to render, but bring a lot of life to a huge flat, boring elevations Wink and, of course, render a lot faster than direct computed glossies [material editor -> vray material -> reflection -> use interpolation -> reflect interpolation settings = -3;-1 or, for better "sharp" precision leave them at their default]
9. USING BUMP MAPS TOGETHER WITH INTERPOLATED GLOSSIES IS PAINFUL
and usually it produces lots of noises - try to avoid it
10. IF 3600pix IMAGE IS JUST TOO MUCH FOR YOUR MACHINE
make it 1600 or 2200pix and resize it to 3600 in PS/PP applying some directional sharpen. or try resizing it in program such as ssplinepro. no-one will notice Smile)) ... until it`s printed on a laser printer ;(
11. REMEMBER THAT USUALLY IT`S A LOT FASTER TO DO SOME THINGS IN PS/PP
than to wait three days for the output from MAX Wink
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