It’s not really a big problem, but I’ve noticed that I get these little white squares appearing in my final render whenever I have the “supersample” setting up to 4 in the render panel. I also get much sharper clearer images as well, so it’s not a bad trade, but rendering does takes a lot longer. Here’s a closeup of an image I’ve been working with - you can see the squares in the upper right area. Has anyone else seen this happening?
Zoid, I also render all my images with a super sample of 4 and have experienced the problems you talk about. Here’s what I think it is.
You know when you have a very complex design loaded up in zbrush, (such as the one your working on) Have you noticed that when in edit mode, when you move the cursor across your peice, it leaves trails of that litte red cursor dot due to your machine slowing down and chugging., they stay there, untill you swipe the cursor over your peice a few times? I get that from time to time especially with very very large high resolution peices with alot going on. When I render it, sometimes for some odd reason, those little trails of red squares end up white in the render and stay there.
Wierd, But true
As of how to overcome it? I find that If I simply leave edit mode before I render, is clears things up ok.
BTW: Kickass artwork!! Love that fog
Hi Scougal, I’ve never seen the red cursor thing but I do sometimes get white lines chattering across the screen and also other weird things, but never anything permanent.
That’s a good comment about rendering in edit or transform mode. You end up only rendering within the bounding box of the selected object. I try to avoid doing that also.
I haven’t had exactly this problem with high sampling, but I’ve had a similar one where I get almost a white outline around certain materials, or things that are normally invisible with no antialias, are suddenly now visible. For instance, all of my post modeling texture work on the picture below. I’m curious to know what gave you white squares??? Hope someone can shed a bit of light.
BTW: Awesome pic! I was so interested in the white squares, I almost forgot to look at the work itself. 
Thanks Slosh, That’s one nasty mean looking devil, pretty intense. I don’t see the white line, but if you want to avoid that spillover onto the background, you should place your figure on a separate layer. If this is two layers, then I don’t know what’s happening 
Zoid, I was able to reproduce the problem, however im not sure how it technically works.
All I did was load up another image I have done, set the render for everything maximum quality, moved the cursor around (the little red dot stuck as usual when somthing so large in size is loaded in zbrush) I hit render, and those white squares appeared.
The image
I then left ‘edit’ mode and went in and out it a few times, and those red trail of squares dissapeared. I rendered again and it came out fine.
This is puzzling. I wonder if anyone else has had this problem.
Yeah, Zoid, it’s 2 layers. One with the devil, and a blank one behind it. Don’t know, but if I use “1” for antialias, it doesn’t appear.
Slosh, if you paint a background on the lower layer with say ZAdd at 2 and RGB value at 2 that will get rid of the color halos. Actually I think anything with a little z-depth placed in the background will get rid of it as long as you fill the entire background.
Hmmm. I wonder if I should try that and do a hi-res, hi-antialias render? If I can come up with a cool enough background, I will.
Scougall said :
it leaves trails of that litte red cursor dot due to your machine slowing down and chugging., they stay there, untill you swipe the cursor over your peice a few times?.
trailing from your computer slowing down and chuging is not true all the way.
a sample would be pick color white
2 simple brush
3 Draw pallete set height to 0
4 draw size 15
5 wave your curser watch it trail
yes and if you set your curser draw size big it will get rid of it
hmmm, so what your saying is that the cursor trailing and leaving bits of red squares on the screen is not from your computer chugging and using up too much memory? This is too wierd.
no i said trailing from your computer slowing down and chuging is (not true all the way.)
it probley is his computer slowing down and not rendering it right i don’t have his pic to test it he might of Filled layer with white before he started but i can’t tell but far as i can see the square white is coming from the Fog Color.
you can not capture a trail when saves as a .PSD it will not show do like i stated above and have it trace white all over the screen then save as a .psd it won’t show up.
so i dought its from trailing from the curser.
he Might change the Fog color to Blue and see if he has a square BLUE box then he will know.
some thing differnt then White and change BOTH Fog colors
hmm, well I rendered that scene with fog on, so maybe it has somthing to do when the fog is being rendered. I have no idea. I find that if I go in and out of edit mode it clears it right up.
well i can’t get the square so its probley his comp memory making it not rendering it right.
he can try and RE Boot and Disable some of his stuff in the START UP menue and re try it.
Go to
1 start
2 Run
3 type msconfig
4 go to the start up tab
Since you seem to be the man who’s full of tips with zbrush 
Can I ask you a question? (sorry to stray from the original topic for a bit)
I have alot of ram, 700+ MB to be exact. However when I’m rendering large peices with alot in them, zbrush chugs to the point of annoyance. I read somewhere that you can alter the way zbrush uses memory to make it run faster when handling large peices. However when I read it, I didn’t understand a bar of what it was saying. Any pointers for that?
yes read page 1 and 2 http://www.pixolator.com/zbc-bin/ultimatebb.cgi?ubb=get_topic&f=1&t=002424
page 2 is your best bet the first page ramble on