Exit portals make things slower(?) - [solved]

SATtva_ · Post by **SATtva_** » Fri Nov 28, 2008 7:07 am

Hello guys,

I'm puzzled with the effect of exit portals. Attached is a simple test setup: a room lit with the sun from two windows, camera inside. I've set bidir renderer and placed exit portal meshes in both windows slightly overlapping them.

Here's the problem: whenever I export and render this scene without exit portals, it's got processed on the order of 86000 samples/s, but with exit portals indicated speed drops to the half -- 39000 and below. However, looking at images produced (both were rendered for five minutes), the "portalled" one looks cleaner to me despite less samples/pixel ratio (132 vs 60). Is it something with statistical data Indigo displays? Or maybe I'm missing something?

About test system configuration: GNU/Linux x86_64, native 64-bit Linux Indigo build v. 1.0.9 (latest stable), Blender 248.1, Blendigo 1.0.9, indigo_console used for the rendering.

pixie · Post by **pixie** » Fri Nov 28, 2008 7:14 am

It might announce as having fewer samples per second but if you notce it actually has less noise.

SATtva_ · Post by **SATtva_** » Fri Nov 28, 2008 7:28 am

Well, I was somewhat prepared for such an answer. I've noticed earlier with distributed rendering that working master machine always reports zero samples received from slaves.

OK, exit portals work as described in the manual, and that's what I was hoping for.

Post by **OnoSendai** » Fri Nov 28, 2008 8:25 am

Exit portals may not produce *more* samples per second, but they produce better (less noisy) samples

Kram1032 · Post by **Kram1032** » Fri Nov 28, 2008 8:58 am

OT: Any sight for behind-portal-content-aware exit protals? (BPCAEP)

SATtva_ · Post by **SATtva_** » Fri Nov 28, 2008 9:21 am

OnoSendai, thank you, this explains a lot. ^^ So, in this case statistics is accurate (displaying number of samples only, not their quality). But, [OT] what about distributed rendering and "Receiving frame ... num_samples: 0.000" on master host? Is that a bug of some sort or I am just again misinterpreting the output? [/OT]

Post by **OnoSendai** » Fri Nov 28, 2008 9:30 am

I haven't seen that issue before SATtva.

SATtva_ · Post by **SATtva_** » Fri Nov 28, 2008 9:36 am

Well, look like the actual merging of slave-processed data is not affected, only statistics.

Unfortunately I'm on non-multilib systems, so unable to check Windows Indigo builds. Could it be something 1.0.9- and Linux-specific?

Kram1032 · Post by **Kram1032** » Fri Nov 28, 2008 10:42 am

If so, it's actually misplaced... As this might not only interest Blender Users

(Just for the future... once is ok... ^^)

SATtva_ · Post by **SATtva_** » Fri Nov 28, 2008 11:08 am

Yep, I went quite off-topic, my apologies.

Exit portals make things slower(?) - [solved]

Exit portals make things slower(?) - [solved]

Who is online