Irradiance Map for Animations - query

[stee]

Hi,

 

New to the forum & relatively new to V-Ray.

 

I rendered a 360 frame animation, using a 'from file' irradiance map which I prepared using every 10 frames. This scene was a flythrough animation on a street, with a proposed development being 'built' (animated) throughout the whole scene. At the end, the camera is sitting looking at the completed building.

 

I now want to add another 180 frames, with the camera static, but the vray sun setting and the scene turning to night. Should I use "Incremental add to frame" and calculate an irradiance map using every 10 frames as I did previously? Or will this give weird results as the light is constantly, and consistently, changing? Would I be better to just set off the render and use single frame??

 

I know I could just render it and find the answer out, but im looking at 25-30 hour render times, so was hoping someone could help out and offer advice.

 

Many Thanks,

Stee

Edited August 12, 2009 by stee
Changing title to be more specific re: 2nd question

[stee]

Can I be so cheeky as to ask one more question?

 

The plan is to link the 360 frames to the 180 frames using video editing software, rather than render the first 360 again.

 

My idea started out as - Flythrough, building being built, camera stops, sun sets and lights in the scene animate from 0.00 multiplier to 10.0 or 15.0 or whatever.

 

I use the same .max file so my camera position and lighting will match the end of part 1 and start of part 2, which need to be identical, so the stitch will be seamless.

 

But when I add lights to it and set their multipliers to 0, it still has an effect of the scene (quite dark). I can't seem to animate the on/off option for the lights, so do I have to begin from 0 again with the lights in place at 0.0 multiplier, edit my skylight to get a decent daytime effect, and then render the whole lot?

 

 

So sorry for all the questions, and thank you in advance.

[Ricardo Eloy]

If you have anything (ANYTHING) moving in your scene, you'll have to render it using the Animation (prepass) method and switch to Animation (rendering) after. This is because you can't reuse the calcs previously done (they WILL have to change in order to reflect the new sun position aka lighting).

[erickdt]

I've done very few animations with moving objects but I've gotten what I thought were good results from regular IR Map and LC (IOW not the animation presets). In fact I never use any of the animation presets for IR and LC and it always looks just fine.

[stee]

Thanks for the advice. It looks like I may have to start at frame zero again if I want to include the lights for the night part of the render anyway.

 

Seeing as I'm new to V-Ray, can people post up finished animations/renders here for critiques? I'm heading away on holiday this weekend and hope to leave it render while i'm gone, because it may take a couple of days. I'd like to get some feedback when its finished.

[subburb]

for the second part (moving sun) you need to make a frame by frame Gi calculation...

 

but perhaps you can start your second rendering to frame -30 to 180 to have an extra 1 second video wich can be faded with the first clip ? perhaps like this you can have decent transition without having to re-render the whole things..