Object Camera Animation GI

[lllab]

then its object animation.
if possible try to split it up in smaller parts so that you dont suffer from the GI slowdown.

i guess if you make something like 200 frames at a bunch, maybe with some frames extra for a short blend in comp to avoid gI flicker it should be ok.

cheers
stefan

[paulselhi]

Thanks.. maybe it's time to learn how to do lighting setups that don't need GI !!

At present i am doing a 1000 frame ani and have added several lights to lessen the need for the GI but when i add even a slight hint of Gi the look is so much better. It's rendering at about a min a frame, standard GI vector Mb and DOF. I suppose if i had the patience and a decent system i could really boost it up, but for now a min a frame for 1000 frames is about all i can take !!!

Probably it will be a lousy render but the tests i have done on small sections look promising

[Simon Wicker]

this would be the perfect moment for using ambient occlusion instead of a full gi render if you are after a 'taste' of the full gi effect.

cheers, simon w.

[paulselhi]

But i still find AO slow..maybe i just have not spent enough time learning it

[AdamT]

Another option would be to bake the GI solution on your non-moving objects.

[SteveB]

I have had good results using very low GI settings (strength 10-20%) in combination with AO and ambient omnis, animate ok too - give it a go! You get nice "flat colour" walls if you know what i mean?

Steve

[paulselhi]

SteveB .. good renders but OT I see your profile info says Manchester, United...

So i take it you are RED ? Just got back from my local football club and had a major disagreement as to whether Wales should have been playing a friendly with Brazil, someone argued that they needed match fitness..bloody hell if they are not match fit by now they never will be..we are 4 games into the season and wales have a competive Euro match in a few days. God knows how we, or for that matter any team. needs injuiries from friendlies now !!!

Then of course you could be BLUE and would dance the night away if Giggs got a broken leg !!

Adam..intersting idea, bake the background and render the moving objects, the vray tutorials work it slightly different in that i think you camera gi the background using camera animation GI then seperately object animate the moving objects then somehow comp the 2

Thing is i am geting away with 1 min frame renders but with really low settings, if of course i wanted some really accurate GI then these party tricks would be most welcome..i just don't have the patience to leave my machine rendering for several days !!!

[SteveB]

Ha! Its.... Manchester.... United Kingdom. Although I live in these parts my heart belongs to Hull City AFC!

Steve

[Ernest Burden]

i guess if you make something like 200 frames at a bunch

If you're going to see the GI 'limitation' you will see it quite quickly, in my experience. I've seen 3 minute frames turn into 1 hour frames with a couple of dozen frames. Of course, that just with camera animation, I've never even tried object animation.

[MJV]

I've tested object animation many times but have always found it to be slower and of lower quality than all other options.

[paulselhi]

Another option would be to bake the GI solution on your non-moving objects.
thing is if you bake the scene ( i assume a camera fly by would be ok here) this will not be accurate as it must respond the the gi influence of the moving objects..or will it ? can a baked mat give and take GI ? if so does this then invalidate the bake ?

[AdamT]

thing is if you bake the scene ( i assume a camera fly by would be ok here) this will not be accurate as it must respond the the gi influence of the moving objects..or will it ? can a baked mat give and take GI ? if so does this then invalidate the bake ?
No, the baked scene won't take the moving objects into account, so it's a bit of a hack. There are ways to reduce the problem but it all depends on your particular scene.

[govinda]

If you're getting results with 1 minute/frame renders, and if you can afford the time, you have a lot of leeway to make things better. Many people put a limit of 4 minutes/frame on animations, although it's just a rough guideline.

And hey hey, no Giggs leg-trouble beyond at most a toe hangnail. I have him on a fantasy team. ;) At least I think that's him--he's so much a chia-pet body-hair freak that after about 60 minutes of a match he's completely furred over and unrecognizeable.

(Completely OT: there's a great auction draft league at FFLO.com. The player auctions work much like Ebay. You'd need another 9 or 11 players to get it going though.)

[STRAT]

i've got a gi object animation example on my website (speeding cars over a bridge). it's gives the desired effect, but certainly takes allot longer to render.

[paulselhi]

Well my low gi test was a disaster too much flickering of the GI, and i also used low AA so the ground texture shimmered a lot ( i always thought that image textures would not shimmer only procedurals, could it be the bump ?)


Anyway i am going with pure lighting and see what happens, when i get the render done i will post it and the scene so if anyone is interested thay can have a go at experimentation

[AdamT]

Image textures will flicker too, depending on your MIP settings.

[paulselhi]

Image flickering is proving to be a bug*er, i have had to crank my AA up and lower the threshold in the render settings to try to get it lessened, it pushes my non GI render times up again !!


good thing is the comp tga alows selective aa and threshold which can be keyed ( or i think they can be keyed..mass in dynamics has the option to be keyed but in fact it cannot be adjusted in sim) so whilst an object is moving fast i can lower the settings and up them as it slows down

i suppose these could be linked by a "velocity" setup in xpresso to auto adjust depending on the movement of the objects / camera

[jondoe0ne]

good idea for a plugin though...

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