Yafray Glass Question

Artwork Works in Progress
#1

I just started using yafray and i love it! i’m getting great effects already. The only the that annoys me is that you can’t see your progress when rendering, but i guess that’s life. :-? Anyway, here’s my first attempt that wasn’t just playing around.

http://img424.imageshack.us/img424/7493/glasstest6ue.jpg

My question is, why can’t i get rid of that ugly shading on the floor? Here’s a pic of my GI settings. Just ask if you want more info. Thanx!

http://img424.imageshack.us/img424/4263/yafraysettings8nc.jpg

Edit:/ Okay, here i go again. (Sigh). I’ll try to be really thourough this time. Ahem. :wink:

The ground should be a nice pale orange, with NO TEXTURE APPLIED WHATSOEVER. Ahh, did that help? :stuck_out_tongue: When i render, these lines just appear. This only happens though when i use GI. Don’t know why. Here’s a blender internal render if it helps. (Quite crappy compared to yafray i might add. :expressionless: )

http://img362.imageshack.us/img362/3451/blenderglass4wo.jpg

#2

press the “xml” button if you want realtime rendering preview.

#3

You could try telling the floor to not recieve shadows. Might make the situation even worse though. Glass does create shadows, and glass as thick as yours could create a pretty dark shadow. Technically it is “supposed” to be there.

Guess you could also try to make the glass base thinner.

#4

On the floor, do you have “TraShadow” selected under material settings? That might help.

#5

The edges of the glass, being at a different angle and almost parallel to the direction of the light, don’t let as much light through and create shadows. That’s why you have shadows around the edges and not in the middle. It’s a realistic effect.

#6

I didn’t mean the shadow around the glass! i think that looks fine. (Curse my terrible explanation skills. :x ) Even though it might look like an applied texture, i meant the weird line pattern on the floor. For some reason i can’t get it to go away, even with relatively high settings. I will try to experiment myself. Thanx for the help!

#7

Ohhh.

That’s just a crappy texture. You’ll have to change it. It’s because the detail is too small and repetitive, it creates this optical illusion sort of effect.

At least, I’m pretty damn sure that’s what it is. See it in a lot of things.

#8

Okay, here i go again. (Sigh). I’ll try to be really thourough this time. Ahem. :wink:

The ground should be a nice pale orange, with NO TEXTURE APPLIED WHATSOEVER. Ahh, did that help? :stuck_out_tongue: When i render, these lines just appear. This only happens though when i use GI. Don’t know why. Here’s a blender internal render if it helps. (Quite crappy compared to yafray i might add. :expressionless: )

http://img362.imageshack.us/img362/3451/blenderglass4wo.jpg

#9

Are you rendering with multiple CPU threads?

Try shutting that off. I’ve had yafray give me little random squares with a slight amount of noise when using GI and multi-cpu rendering. I think I’m seeing those “squares” in your image.

Also try bumping the GI settings to maximum… lower settings can also create a lot of noise.

Turning up the OSA can also get rid of noise, mostly by blurring it out of exisitence. :wink:

#10

Hey, I’m not sure if this will help at all, but try to set your photon radius a lot lower. Around 4 or something like this. Don’t know if it helps but as far as I remember you can get strage lines if your photons are to big.

  • Kåre
#11

Hi, will try to help.
First of all increase ray depth - number of light bounds. I think that when You render glass in Yafray, its good to set this parameter over 20.

Then read this paper:
http://www.blender3d.org/cms/Alejandro_Conty.450.0.html
It describes the way Yafray lightning works. You will see then, that probably there were no need to increase power of GI. 1 should be enough.
So radius, as Kåre said, is too high… Make it lower.

Next, to get realistic shadows under Your glass plate You have to use photon lamp, which doesn’t emit light but only let you get caustic and energetic effects.
Good tut about caustic:
https://blenderartists.org/forum/viewtopic.php?t=30265

Next point is gamma. Will say again - there’s no need to set high level of GI Pwr.
Check this out:

And about Your crappy texture. Only thing I get on my mind is doubled verts or whole object. Try to remove doubled verts… Maybe it will help…

#12

that first image looks good :\