kray render accuracy

[jnom]

What's the best way to get the same output from kray given a scene is static?
I notice the same problem for both kray and lw renderer hitting F9 on same scene, same frame the output is not the same. Its probably because of Finalgather in both.
No baking ofcourse.

[jure]

It's not so much the problem of FG as it is of photon shooting. Photons land randomly in scene every time you press render frame. You can get same result if you save the GI (at least the photon part) to file and then reuse it for second render.

Or you can use crazy amount of photons so that the variance between photon map in both renders will be very small.

[jnom]

I thought native lw didn't use photon mapping. But it still exhibits that behavior which there were some discussion at newtek that lw native renderer is not accurate. For example fprime when it fires rays, it fires them at maybe 99% accuracy so renders will almost always look identical on same frame without baking. That's why there's no need to bake renders for any type of animation.

[Janusz Biela]

I thought native lw didn't use photon mapping. But it still exhibits that behavior which there were some discussion at newtek that lw native renderer is not accurate.

I think LW use PM, but engine is quite slow and not good (comparing to Kray)

For example fprime when it fires rays, it fires them at maybe 99% accuracy so renders will almost always look identical on same frame without baking. That's why there's no need to bake renders for any type of animation.

FPrime has only two "engines" : Raytracing and QMC (no interpolation) So in Fprime You do not need baking... becouse does not exist
FPrime is just real time prev with QMC , Kray does not have real time render yet. Of course if will be, will be with all features from Kray: great tonemaping, instance, very good speed etc. After that use FPrime will be completely nonsense (but still I use it for recognize surfaces, setup textures, etc)

[jnom]

FPrime has only two "engines" : Raytracing and QMC (no interpolation) So in Fprime You do not need baking... becouse does not exist

Vray has baking but not needed or effective everytime especially for animated deforming objects. Its better to use Irridiance+bruteforce with no baking. In my experience same frame renders in vray are also 99% accurate with no cache. I'm wondering if inaccurate rays are a lightwave thing.