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The current scene i am working on has feature lighting in the ceiling. However i have an issue with the emitter. It shows a zig zag line and areas of darkness. The emitter was applied directly to a face in sketchup. What is my mistake ? Should i have subdivided this face ? Should i have kept it hidden from the camera ? Does the smoothness of the emitter have any input ? I have 2 source of light in the scene. The rear pendant lighting does not have this problem, i applied the emitter to a sphere inside the pendant. I think i will have to use photoshop to fix it in this case because i cannot afford to lose the render time ! I have tried adding diffraction and scattering but it does not hide the problem. Also adjusting iso and emitter values does not help. I was hoping a higher SL would solve the problem.Many thanks in advance.


Chedda




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Which version of Maxwell do you have?

The latest version i'm up to date. I am starting to think it is concerning sub- division. The planes are long & thin so i'm thinking thats the problem ?

This can happen if the AA is too bright (above 1,1,1 RGB). The AA is there but it appears all white. You might be able to solve this by combining two exposures. One for the area with AA problems and one for the rest. Or try changing the the burn.

Cheers, Florian

I tried the burn no joy. It's not the sub division either. I am starting to think i should model the lighting elements rather than simply painting a visible face.

If I remember correctly this is because the clamp between the super bright area and the not so bright areas.
You can check this topic, a little bit oldie but with some answers. http://maxwellrender.com/forum/viewtopi ... em&start=0

Cheers
JC

Also you might try enabling the sharpness slider and reducing it... thankfully this looks like a fairly easy fix in post though.

Best,
Jason.

Thanks for the tip. I have opted to apply the light to a tube geometry and hide it in the recess. I think modeling real elements and hiding them is the way ahead. My original planes are just not realistic enough particularly in that they are visible.

Thanks Jason i'm pretty anal with rendering i don't like to post process unless i'm cornered ! I know this is an issue i have to over come although maxwell needs less post than most.

chedda wrote:Thanks Jason i'm pretty anal with rendering i don't like to post process unless i'm cornered ! I know this is an issue i have to over come although maxwell needs less post than most.

I know the feeling, I avoid post like the plague -- but I force myself to do it to prove to myself that it really does always improve the image.

There's something about the way our eyes work that just needs that human touch -- in the same way almost all photography goes through post... and commercial photography often goes through a ton of post.

Best,
Jason.

I noticed that your zoom percentage is 75% in that screen grab. Zooming the mxi preview can cause some AA issues that won't be there when you write out the image. This probably isn't your issue, but I thought I'd mention it.

Also some critiques, hope you don't mind:

Your windows transition straight into the aluminum frames. It will improve the believability greatly with just a simple modeled rubber seal between the glass and the frame. Even better would be to find the window frame manufacturer's cad section and use that as a sweep. Maxwell loves high detailed models.

No edge in that building will be perfectly 90 degrees. Everything should have a small radius. Maxwell will pick up the highlights on the edges fantastically.

The large black void in the bottom of the render is very distracting. What is it? Can you add more details to this since it's so prominently shown in the foreground?

All of your materials appear to be completely solid. A little textured roughness variation goes a loooong way.

Thanks for the tips Bubba. I am working with sketchup so i aim low poly ! At some point the model hits the wall and it's almost game over. That black void is supposed to be a reception desk !

I added the silicon edge Bubba and yes it looks better ! I also took your advise and smoothed off the offending corners problem solved ! It seems the hard edge was creating the anti-alias problems. Thanks a lot Bubba.

Chedda

Glad it was helpful!