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Betaserver: Double renders?

Submitted by ReFa on Wed, 2008-06-25 03:38.

Just a little question. When i look in the upload/renderque and look at the rendered frames of the sheep.... why are the frames 160-319 exactly the same as the frames 0-159?
I can see it wrong, but now it seems to me that the rendering of one loop or edge takes twice as long as needed?

Gr, ReFa

‹ ElectricSheep 2.6.8 NOT running under RHEL5 Bad genome file (v2d7b)? ›
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Dupes are for redundancy

Submitted by Erik Reckase on Wed, 2008-06-25 07:09.

The frames are rendered twice to automatically check for bad renders (which happen on occasion - corruption of the genome when transferred, etc. The frames *are* different (different random seeds, I believe) so they are averaged together to get the frame that goes into the animation.

Erik Reckase
flam3 developer
AIM: flam3dev

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right, each frame is rended

Submitted by spot on Wed, 2008-06-25 18:11.

right, each frame is rended twice with different random seeds. the results are averaged to form the final frames, so I wouldn't call it redundancy, since if an error is detected then both frames get redone. no rendering is wasted.

the problems don't come from network transmission, since TCP has a checksum, but from bad RAM and cosmic rays which flip bits during the rendering.

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Both are re-rendered?

Submitted by RMI on Thu, 2008-06-26 18:43.

Wouldn't it be more economical to re-render just one, and compare that to the 2 original ones?
2 out of 3 should be identical, unless you got 2 corrupted versions. In which case you continue adding one until you do get a duplicate.

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that's what we call "crazy

Submitted by spot on Thu, 2008-06-26 18:51.

that's what we call "crazy talk". 10 times more complicated, infinitessimally more efficient. aka: a bad plan, not happening.

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Ok, thank you both for the

Submitted by ReFa on Wed, 2008-06-25 18:51.

Ok, thank you both for the answers :)

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