animation with v-ray

[ERTHAL]

Hi there! I'm starting an animation project, basically an architecture walktrough; and i wuold really like to hear from you guys what would be the best way to get a good gi result in the scene. Im trying to simply use the settings i use for still image but as the animation runs, there is a noise pattern that seems to stick in the camera lenses and is really bothering me. Any tips?

[tom schuelke]

Hi Erthal

Welcome to our forum. Its a realy great place to learn from. for all of us.

Yes you are right the flickering is what you should expect when you render animations the way you do for single frame immages.

first the next depends on the vray version you use. i´ll describe it for the 1.475 which is the beta for the upcoming 1.5, which you can also have on your download account as a registered vray user.

well all animations and light simulations get their speed from very very intelligent stochastical light aproximations. if the imap calculation which you should have tried allready only calculates special points in the immage, it has chosen to be a intelligent one to do. Each gi pass it goes on, it looks on the color contrast between the rendered points, the normal threshold and so on, to see if in the next step it should render any point inbetween those two points next.

this way vray like all other renderes computes beautiful immages..

but when it comes to animation, you see, from frame to frame that this only is a aproximation. and you see the smal differences to a perfect calculation.

now. when you render flightthrougs, use for secoundary bounces, the new lightmap calculation and for first bounce, irradiancemap. but instead of doing this with single frame animation, switch to incremental ad to current frame. also switch on in the global settings, "dont render final immage", this forces vray only to do the lightcalculation, but not to render the real final immage with for example all the reflections.

now also turn on rendern only each 10th or 15th frame.

now when you render, vray renders the first immage (only the lightsimulation), jumps ahead 10 frames, and looks which new areas have been coming into the camerafield, and now it only renders the new regions. This way it goes on the whole animaiton. (this only works, when only the camera moves and nothing more).

now switch on ageain render each first frame,
turn of "dont render final image, and save the rendered irradiance map to some location. this saved i-map is the solution for flickerfree flightthroughs.

load it in the irradiancemap settings, and render now your animation.

good luck. by the way. in the announcement section is a thread to the betatext of the upcoming 1.5 version. posted from vlado, one of the programmers. here you also should find some tutorials.

Good luck

Tom

[tom schuelke]

i´ve been looking for the link for you.

here´s vlado´s link to the internal help index.
http://www.spot3d.com/vray/help/VRayHelp150beta/

this could be a link to a tutorial for you.
http://www.spot3d.com/vray/help/VRay.../tutorials.htm

Tom

[ERTHAL]

?

Hallo,
Well, i am using the beta built version you have mentioned, and i notced that the lightmap can also be saved. Should i save the lightmap and the irradience map in this "firs pass" for gi calculation?
I have a small renderfarm with 5 machines. Will this process work with the renderfarm? i mean... Can the other machines save the lightmap and irradience map at the same time in the same file?
danke!

[tom schuelke]

Hi ERTHAL

no right now, precalculation only works on a single machine which should change in the future.

save the irradiance map after precalc. and put it to a network path, so the other machines can see it.

Tom