I just finished a render with soem trees and soem fog and soem nice light and get the artifacting shown here. Any ideas on how this happens. How it can be avoided or fixed?

are you sure those are not shadows ? there are a number of other similar artifacts on the right side of the image. A couple seem to end at the top of the blue area.

Trees often interact poorly with volume materials. A few people have had these problems, I don't know how to fix it other than removing your volume materials sorry :(

Try re-rendering at a different rays per pixel and they often go (but your render takes forever.....)

If they're duplicates of each other this sort of thing happens, try changing each tree just a little bit and see what happens

wait for bryce 6 it will be resolved probably.

I'll be watching this thread closely. I ran into same thing trying to get a snow covered effect of a leafless hardwood tree. To duplicate problem 1) create tree 2) change trunk to whatever pleases you and set number of leaves to zero in tree lab 3) duplicate tree then back to tree lab 4) change trunk texture to simple white or snow texture 5) resize and move slightly RESULTS: trash!!! I never could get rid of huge chopped out sections. Yeah, what is happening? I moved duplicated tree to left in this image to illustrate missing sections

Skiwillgee, Bryce trees are metaballs and they interact with themselves sometimes when brought too close together making for strange creations. One solution is to go to DTE and create materials like those used on snow covered mountains for the trees and leaves.

I have no idea, my best guess is some glitch in the mesh that happens to me occasionally. You may have to start over.

It is a rendertime error in the code. When two identical trees (as may happen with duplicates and clones) visually overlap (from the camera POV) bryce gets confused and may produce such artifacts. I did a serious set of research into this about tywo years ago (still might be able to find the thread though). The solution is to select one of the affected trees and just tweak one of its settings so it is no longer identical - bryce then ceases to get muddled!

Thanks a lot I will try to change the tees and get away form the duplicate trees. I think it might have to do with the volume materials too because I did not have this problem beforeI think the volume materials did nto encompass the trees. It was redered at 16 rays I don't wantto go higher. I will try to change all the trees a bit ansd see how that goes. Great info here. Thanks.

@incarnadine I don't follow "tweak one of its settings" you mean randomness or gravity? Sizing does nothing. @ Quest I don't think it's a metaball issue at least it doesn't behave as a normal metaball would when it nears another, althought the missing chunks do seem to deminish the further the clones are spaced. I originaly gave up on it although the desired effect seemed feasible

Tweak any of the settings in the tree lab so the trees are no longer exactly the same (except maybe for leaves, I'm not sure if changing that would fix it and I'm too lazy to check). You only have to change it by a little and the problem goes away.

randomness is usually the easiest to alter.

Attached Link: http://www.renderosity.com/messages.ez?Form.ShowMessage=1228371

Found it! BTW I usually tweak the random. You are correct in that changing scale does not really change the identicalness.

Great thread link. Thanks I still have nto got to changign the offendign trees on the pic. Just a a matter of time tonight I'll do it or tommorrow morning.

I find that these artifacts are really intrigueing. They could be the point of force of a new "abstract" render. After you've rendered your original idea, of course.

Attached Link: http://www.renderosity.com/viewed.ez?galleryid=938033

Hey here is a rerender with a few small changes. Thanks for all the help. Soemthing new every day here.