Est

[glorybound]

Why is the BF est. time so wrong? I typically bail early due to the extremely long est. time, however, if I just let it run, it's usually really fast. I wonder how many people bail with BF because of the est., when in fact, it would be cleaner and faster than IRR? There has to be a way to quickly calculate est. render times accurately. In theory, every time you double your render size, your render times would be 4X as long. Couldn't V-Ray internally render a thumbnail and multiply it by the final render size?

[super gnu]

I would imagine that nice simple size relationship breaks down by the time the thumbnail is small enough to be practical for this purpose? You'd end up with objects that are a significant factor in your final image, sharing a single pixel with other things.. Plus DR and even multithreading, tend to break down on really small images. However, as a concept, there may be some mileage in it.

[super gnu]

i usually assume the time estimates are way off at first anyway.. and usually have a reasonable idea of final rendertimes due to all the smaller test renders ive been doing.. so i guess that is kinda your process, but the manual version

[vlado]

Couldn't V-Ray internally render a thumbnail and multiply it by the final render size?

It's possible, certainly... although that will take some seconds to compute.

Best regards,
Vlado