Forum: Vue


Subject: Black dots in render

croxie opened this issue on Jan 21, 2008 · 8 posts


croxie posted Mon, 21 January 2008 at 2:17 PM

During the past few days now I've been working on a big render that includes a lot of models. So I've decided to render it in stages and make a composite in Photoshop later.

Today I rendered the first layer, and when it was done it looked like the piccie above.
Black big dots made it look as if Vue ran out of pixels :p
I know this is not the case, but I'm not sure what is doing this.

It was rendered in Broadcast, and with the option to "Apply motion blur to object disformation".
I might add that those dots does not show up in Preview or Quick Render.

I'm using Vue 6 xStream and WinXP.

Thanks for peeking and thanks for any suggestions what this might be :)

Christa

"Keep smiling, it makes people wonder what you're up to."


bruno021 posted Mon, 21 January 2008 at 3:57 PM

I haven't seen those black dots in a while, thought they had been fixed. I don't think you did anything wrong here, this is a render bug. You should contact tech support about it, and send them your scene so they can see what's causing this.
Maybe due to the lighting model (radiosity, maybe?)
Applying mo blur to object deformation is only useful to apply blur to plants reacting to wind in an animation, btw. From your screenshot, it doesn't look like you have set up an animation. If your scene is a still, you'll add render time for no result.



croxie posted Mon, 21 January 2008 at 4:04 PM

Thanks Bruno.
In theory this shouldn't happen at all since I even have the upgrade that was suppose to fix this in xStream.

Since I posted here I've done some reading about this in other places, and it seems to be connected with the use of a color mixing function in mixed materials....which was what the upgrade I have was for, among other things.
And there's a lot of mixed materials with color mixing functions in this render, so I think that's the reason.

C.

"Keep smiling, it makes people wonder what you're up to."


bruno021 posted Mon, 21 January 2008 at 4:09 PM

Oh, I didn't know the reason for this.
Well, let tech support know they didn't quite fix it!



croxie posted Mon, 21 January 2008 at 4:12 PM

I didn't know the reason either before I posted here, and I was silly enough to post first and then do a search for any clues online :p

And yes, I will let them know. I'm trying to figure out which function it is that is making this happen right now.

"Keep smiling, it makes people wonder what you're up to."


lindans posted Tue, 22 January 2008 at 4:59 AM

I had the same problem with a scene I was doing over the weekend, objects I used had a lot of black artifacts on them, I put it down to something I had done because I tried a few objects with the same result. I am using Vue 6 Infinite with the latest update. Will post when I get home.

Oh, let the sun beat down upon my face. I am a traveler of both time and space ....Kashmir, Led Zeppelin


garyandcatherine posted Tue, 22 January 2008 at 11:58 AM

I really cant offer anything new, but if this were to happen to me I would try the following:

Select the objects you think are effected by the render.  Change their colors to a basic color, like red, blue or some high contrasting color so you can spot them easily when you do render.

Try rendering again and see if it was a texture/material issue

If this doesn't give you a clue as to what is going on, then I would select ALL objects, give them a basic color and try rendering again.

If this doesn't lead to a clue, try turning off some of the layers of objects you have and keep experimenting with some renders.  

None of this might work, but at least you can begin to narrow down the problem and know whtat the problem is not while waiting for e=on to fix the problem.

Hope it helps


croxie posted Wed, 23 January 2008 at 7:24 AM

Well, I've gone through the entire scene during the past day or so and I will have to start over. It seems that I can't isolate the material that is playing hooky with the render engine. It's become too complex and I have 7 buildings, 8 roads and a lot of vegetation all together that can make this happen.

So I'm going to do it the safe way and start over, using only the materials that are in Vue as default. Obviously I've created one too many mixed materials that has a color function or two that won't play well together.

Thank you all for your input on this :)

Christa

"Keep smiling, it makes people wonder what you're up to."