Strange Render Artefacts

I’ve just started using Blender yesterday, as a replacement for 3ds Max. I did the following as a practice scene, just to play around with the lighting and render settings and such. No matter what I do, I can’t seem to get rid of those squares that occur in the solid spaces of the image. Could anyone offer me a suggestion as to what it might be that’s causing this?

Thank you

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wow, that’s kind of weird, can I see the blend?

it almost looks like you didn’t let your render finish, and it is just keeping part of the last one, but those squares are too small

Here’s the blend. I added a .jpg extension so it would upload properly… you may have to remove it

The render took a little over an hour, so maybe it was my screensaver kicking in that interfered with it, or something? But you’re right, the squares look much smaller than the ones that usualy show up while it’s rendering.

Please do give it a try, and let me know how it works out. I think I most likely changed some setting that I shouldn’t have… I’m just not sure which one

–doesn’t look like the blend file will upload. how do people normally do it here?

Looks like a Yafray render in which case your Photons need tweaking or they’re ‘leaking’ (your bounding cube has holes).

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I thought that might be it, so I increased the count from 20,000 to 60,000. Didn’t seem to make much of an effect. Should I be changing the radius?

Increasing the number of photons is not going to make a difference, but making radius smaller should work. Also, making a wall into a cube might work as well.

you could use www.zshare.net to host your files :yes:

About photons, gat is right, once you have shot a decent amount of photons (100.000 photons, 3 bounces), the most importan settings are ‘Radius’ and ‘Mixcount’. Explained here some days ago:
http://www.yafray.org/forum/viewtopic.php?t=1120

Alvaro.