(Problem) Netrender screen corruption?

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Offline SonicConstruction

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« on: December 28, 2017, 03:56:17 PM »

Hi All

I have configured netrender in Mandelbulber 2.11-1 to use more than one machine, however when I do this there is some visible (tearing?) corruption in many of the output frames.
I am using machines of different type and number of cores. I couldn't see anything saying this would be a problem?

8 core Ryzen R7 1700 - Ubuntu 16.04
6 core Mac pro 2012 - Sierra

Whichever is the server the result is the same and its fine if I render on either machine in stand alone mode.

Has anyone had these kind of problems and is there something obviously silly I am doing? (I tried increasing the ray-marching step multiplier which didn't help)   :(

regards

Alan

Offline buddhi

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« Reply #1 on: December 28, 2017, 04:13:37 PM »
I'm not sure where exactly is the problem, but this frame which you showed was rendered at extremely low distance from fractal surface. It can produce significant numeric errors. As I see these two machines are completely different hardware platforms, so they can produce a little different output at limit of calculation accuracy (at 15th significant digit).

Do you observe similar problem on another frames, where distance is higher?

Offline SonicConstruction

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« Reply #2 on: December 28, 2017, 04:32:26 PM »

thanks buddhi

I'm pretty new to this environment but yes, I think that was very close. Ill try with something further and reply here.

regards

Alan

Offline SonicConstruction

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« Reply #3 on: December 28, 2017, 09:26:45 PM »

..yes that definitely makes a difference. guess I was too close on those frames  :fp:


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