Following VRay’s guide to rendering animations why is it recommended to use IrMap over brute force for an animation in VRay 3.4? is it significantly faster? or are there other factors at play?

f.e.: these are two renders in the exact same vein as the ones done by Vlado back in the other thread, but with a diffuse-only scene. The saved LC is pure red, it’s loaded, and the render is run on top. Retrace at 2.0, then at 8.0, then at 16.0. Besides the direct light from the IBL, notice how i…

the correct render [correctrender.jpg]

Thanks for detailed explanation. The formula for increasing LC in relation to retrace is quite helpful (maybe a future tooltip?) Reading the linked thread, it appears that Vlado is saying that the threshhold corresponds to the distance the ray travels from the camera. If it is set to 0 then it just…

Yes, raising Retrace makes it slower, but helps removing (entirely) splotches.

Again, thank you Lele for the details you provide. However, I’d still have a question: I don’t know what precisely happens “under the hood”, but don’t Retrace and Leak Prevention kind of double the work ? it’s a bit obscure to me … Thanks.

[image] Modern Bathroom Again, thank you Lele for the details you provide. However, I’d still have a question: I don’t know what precisely happens “under the hood”, but don’t Retrace and Leak Prevention kind of double the work ? it’s a bit obscure to me … Thanks. I don’t think i understand w…

[image] Invalid Geometric Normal - VraySSS2 & VrayDisplacement in 3.2 I don’t think i understand what you mean. In which way do you think they overlap? I mean, both are supposed to help in enhancing LC precision, right ? with the aim of reducing LC flickering ?

Ah i see. Well, yes, but one’s an interpolated method, the other an oversampled one. In other words, the LC excels at distributing light fluxes through BOUNCES but the tradeoff is it’s not so precise SPATIALLY. We do not want to give away the former entirely to BF (that’d be quite slow.), but we …

Lele, you’re a knowledge mine ! thanks a lot. It’s much clearer for me now :slight_smile: You write that activating Leak Prevention has a negligible cost, so I guess it could be ON by default, don’t you think ? also, again an obscure value: 0.0 sets it OFF, ok, “default value of 0.8 should be enoug…

Watch out, you may already have a V-Ray Setting saved as “default”. LP is in fact set to default at 0.8, and hidden from the default view. :wink: Try renaming or deleting that V-Ray preset (render settings, advanced, presets), and resetting V-Ray, and you should see the originally shipped defaults…

Why IrMap over Brute force for animation rendering?

Common Common :: Render Theory

_Lele April 14, 2017, 8:51am 85

I don’t think i understand what you mean.
In which way do you think they overlap?

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Why IrMap over Brute force for animation rendering?

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