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Re: Raytrace - what are the best techniques for speedy tracing?

Subject: Re: Raytrace - what are the best techniques for speedy tracing?
by fragomatik on 2009/9/15 11:55:22

Hi Johan, thanks for the reply...

Yes, I try to keep light sources and reflective surfaces to the minimum number absolutely necessary.

It is not the actual video editing and post-processing that is the problem - I use Cyberlink PowerDirector and VirtualDub to do all that and they're great

The problem is that raytracing 2000 pics takes a very long time. I am seeking suggestions for improving raytrace speed.

The video compositing within Imagine that I was referring to in my original post is just a method I've come up with to make rendering faster. It's really just a multi-pass technique. Works okay in limited situations, such as when you don't need shadows on the background imagery (eg. the flying-car in my image HabitatFlight was raytraced but the habitat in the background was done in SCANLINE).

I've used a lot of desperate tactics to get quicker rendering results. One time, I started two instances of Imagine loaded with the same staging file. I then setup one to do the odd numbered frames and the other to render the even numbered. I used Task Manager to lock the affinity of each Imagine instance to its own CPU, and started them. It worked! Using this method I rendered the total number of frames in about 65-75% of the time compared to using one Imagine process to do each frame in sequence!

But when you are doing 2000 frames with each raytraced frame taking up to 2 hours or more, even a 35% time reduction is still a long time

So I was wondering what other users do to improve the speed of rendering especially in TRACE mode, while still getting a reasonable result.
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