What is the general workflow for rendering walkthroughs?

[zhopudey]

I'm trying to create a walkthrough for the 1st time. I have moving cars in the exterior, and flapping curtains in the interior scenes. I'll be rendering at 1280x720, 25fps.

 

1) I'm using IR and lightcache. Is this ok for animations?

2) 1st, I'll calculate the GI maps. Can I do this at quarter rez, and every 10th frame in order to save time?

3) In IR, do I keep Multiframe incremental or Animation Prepass? I don't know the diff between the two.

 

Any other tips?

[Corey Beaulieu]

Pre-calculated IR's are for cameras that move not objects that move. By this I mean that you will either need to separate out the objects that move and render them separately as Brute Force and then composite them back in or do the whole thing Brute Force.

 

You'll want to use Multi-Frame Incremental for the method you are describing. Animated Prepass is typically used when you render out a an IR for every frame and then on the final render end these frames are blended together 5 or 7 or whatever at a time to create a consistent IR map for the over all shot. This method can be good if you are getting quick render times, but usually it is just time consuming.

 

Last suggestion would be to calculate at 1/2 Res. And at this time Light Cache should be set to "Fly-through". No need to save out the light cache separately, it will store with the irradiance map.

 

Good Luck.

[zhopudey]

Can I use multi frame incremental if I have animated objects? Or will I have to use either animation prepass / or render the moving objects separately?

 

Sent from my GT-I9000 using Tapatalk 2

[Corey Beaulieu]

So IR is a pass that looks through your camera and determines what pieces of geometry can be scene and what cannot. This means that back faces are culled from further calcs (I'm guessing to reduce render time). When Geometry moves and you render an IR for every 10 Frames, it means that 9 frames worth of information about moving objects is missing and the renderings will blink, look dirty, and all sorts of other things. I personally usually hide moving objects and then do the IR for every 10 frames and render out the final. Then go back and matte out everything BUT the moving objects and render them Brute force (using regions where I can) and composite it with AE or PS. With the Animation Prepass method, if one position changes for any object, you'll have to re-render a new IR for every frame.

 

Multiframe incremental is a way of telling Vray that there is an animation in the scene, but nothing changes very drastically between 10 frames throughout and that it can interpolate these frames as a fluid IR for the whole animation. Step by step the new IR frames add to the old and create a single map.