Radiosity on the move

[JamesLeaman]

Hi
I am just setting up a lighting rig for an interior of a house which will be a flythrough. And I have got a setup which is ok but I have an issue that when I hit f9 (render) I get different results every time with darker and lighter shadows, which is foing to mean network rendering or amending will be impossible, when I render a sequence its ok but if I was to cancel the render and re render from where I left off the results are different, This project will need quite a bit of re-rendering.
I am using lightwave 9.3 with attached radiosity settings, Its takes about 40 secs to render at momenton final gather, I have also tried on monte carlo but have same problem I guess its something to do with interpolated, but when i turn this off it takes about 10 mins to render,
Does anyone have any ideas many thanks

James

[Mitja]

I think it happens because lw fires fg rays randomly each time. If you cache radiosity this problem is less visible. And afaik there's nothing you can do, apart render your sequence without re-rendering.

[JamesLeaman]

Many Thanks
Think I might have to use fprime instead! just not as quick

[jameswillmott]

9.5's file based cache would solve this problem for you nicely. Join the Open Beta program and try it out.

[vfxwizard]

when I render a sequence its ok but if I was to cancel the render and re render from where I left off the results are different, This project will need quite a bit of re-rendering.


That's how it works in 9.3. My suggestion would be to join the open beta and see what version 9.5 has to offer in this regard.

Otherwise try upping the number of rays. This way the different cache solutions will be more similar when you stop and restart the rendering.

This alone won't solve the problem. So, when you restart the rendering, start a little before than the stopping point. Say 30 frames before. Cached rendering is so fast it won't affect much render times.

Then do a dissolve in a compositing or editing package over the last 30 frames of first render and the first 30 of the second. Frame contents are identical and the dissolve will gently blend the two different radiosity solutions.

Doesn't work always (depends on scene content and how recognizable the illumination differences are) but is worth a try.

Hope this helps.

[JamesLeaman]

That seams to of solved the problem, by putting the cache preprocess to never! Nice one guys

one question lightwave 9.5 says it will exprire in 30 days, just wondering what happens then will we have to purchase 9,5 or will it be a free upgrade? don't reallly want to start the project in 9.5 then find that i can't use it in 30 days, sorry bit new to all the ugrade stuff!!

James

[Mitja]

That seams to of solved the problem, by putting the cache preprocess to never! Nice one guys

one question lightwave 9.5 says it will exprire in 30 days, just wondering what happens then will we have to purchase 9,5 or will it be a free upgrade? don't reallly want to start the project in 9.5 then find that i can't use it in 30 days, sorry bit new to all the ugrade stuff!!

James

This is stuff for beta forums. Nobody will answer outside the beta-zone due to NDA. Damn NDA .... :devil:

[kopperdrake]

Hey :) I'd also down the tolerance - I usually have mine around the 0.1 setting.