strange artifacts in Blender animation render at DVinfo.net

Jeff Troiano · December 6th, 2011, 09:50 PM

I am teaching myself how to use Blender. I've bought a few great books, and am working my way through them. Sometimes the lessons get tiring, and I mess around and follow some online tutorials. I followed one the other day, to make a realistic view of the earth. The tutorial only went as far as to how to make the still image, and didn't get into any animation. I decided to try and play around with key framing some things and animate a short clip. I did this twice, changing rotation speeds, and doing a camera dolly, but I didn't mess with any render settings. When I took the png images and created the 15 second clip, I noticed strange artifacts moving around the globe image. This happened in both the scenes I rendered. I'm posting, hoping someone might have seen this before, and would know what setting/s might be causing this to happen.

Thanks for any help,
Jeff
Earth Space View - YouTube

P.S. Yes I realize my earth is rotating the wrong direction...haha! I'm was more concerned trying to figure out my artifact problem

Cole McDonald · December 6th, 2011, 10:02 PM

That's interesting, I've never seen that before. It almost looks like a "film effect" plugin is overlaid on it.

Jeff Troiano · December 6th, 2011, 11:10 PM

I cant seem to figure out what it is. I rendered in png, turned compression all the way up, same thing, turned compression all the way off, same thing. Turned anti aliasing down and up. Just not sure where else to look. This is the first animation I've tried to render. As its rendering the individual images, I can see the artifacts.

Ken Hull · December 7th, 2011, 12:56 PM

Jeff,

I don't know what's causing the artifacts, but I have a suggestion.
The problem looks similar to one I had (using different software) when I was making a pool of water. The semi-transparency of the water messed with the rendering of the ground beneath it. It looks like you have a semi-transparent atmosphere object over the Earth object. Try removing the atmosphere object, then re-render the animation. If the artifacts go away, then maybe the two objects are interfering with each other. I don't remember if Blender gives you a choice of making either a tessellated sphere or a globe sphere. If it does, try changing the sphere type on one or both objects.

One other possibility is Z-fighting, where a very thin object is immediately in front of another object. I would think that your atmosphere is already thick enough that you would not get Z-fighting, but you might try thickening it.

- Ken

Jeremy Dallek · December 13th, 2011, 05:50 PM

I had watched a simple tutorial on making a glass with some red liquid in it, and there was a tip about not having the liquid actually touch the inside of the glass. I think the solution was that there was no actual inside wall of the glass where the the liquid was. Try making the atmosphere a solid sphere with the earth inside instead of a hollow shell around the earth if that's how you have it now. I'm just learning blender as well, so I may be way off, but hope this helps or sparks some ideas.

December 6th, 2011, 09:50 PM	#1
Jeff Troiano Major Player Join Date: May 2003 Location: Nashville TN Posts: 480	strange artifacts in Blender animation render I am teaching myself how to use Blender. I've bought a few great books, and am working my way through them. Sometimes the lessons get tiring, and I mess around and follow some online tutorials. I followed one the other day, to make a realistic view of the earth. The tutorial only went as far as to how to make the still image, and didn't get into any animation. I decided to try and play around with key framing some things and animate a short clip. I did this twice, changing rotation speeds, and doing a camera dolly, but I didn't mess with any render settings. When I took the png images and created the 15 second clip, I noticed strange artifacts moving around the globe image. This happened in both the scenes I rendered. I'm posting, hoping someone might have seen this before, and would know what setting/s might be causing this to happen. Thanks for any help, Jeff Earth Space View - YouTube P.S. Yes I realize my earth is rotating the wrong direction...haha! I'm was more concerned trying to figure out my artifact problem

December 6th, 2011, 10:02 PM	#2
Cole McDonald Trustee Join Date: Nov 2005 Location: Sauk Rapids, MN, USA Posts: 1,675	Re: strange artifacts in Blender animation render That's interesting, I've never seen that before. It almost looks like a "film effect" plugin is overlaid on it. __________________ Web Youtube Facebook

December 6th, 2011, 11:10 PM	#3
Jeff Troiano Major Player Join Date: May 2003 Location: Nashville TN Posts: 480	Re: strange artifacts in Blender animation render I cant seem to figure out what it is. I rendered in png, turned compression all the way up, same thing, turned compression all the way off, same thing. Turned anti aliasing down and up. Just not sure where else to look. This is the first animation I've tried to render. As its rendering the individual images, I can see the artifacts.

December 7th, 2011, 12:56 PM	#4
Ken Hull Major Player Join Date: Nov 2007 Location: San Diego, CA Posts: 240	Re: strange artifacts in Blender animation render Jeff, I don't know what's causing the artifacts, but I have a suggestion. The problem looks similar to one I had (using different software) when I was making a pool of water. The semi-transparency of the water messed with the rendering of the ground beneath it. It looks like you have a semi-transparent atmosphere object over the Earth object. Try removing the atmosphere object, then re-render the animation. If the artifacts go away, then maybe the two objects are interfering with each other. I don't remember if Blender gives you a choice of making either a tessellated sphere or a globe sphere. If it does, try changing the sphere type on one or both objects. One other possibility is Z-fighting, where a very thin object is immediately in front of another object. I would think that your atmosphere is already thick enough that you would not get Z-fighting, but you might try thickening it. - Ken

December 13th, 2011, 05:50 PM	#5
Jeremy Dallek Regular Crew Join Date: May 2009 Location: Minneapolis MN Posts: 40	Re: strange artifacts in Blender animation render I had watched a simple tutorial on making a glass with some red liquid in it, and there was a tip about not having the liquid actually touch the inside of the glass. I think the solution was that there was no actual inside wall of the glass where the the liquid was. Try making the atmosphere a solid sphere with the earth inside instead of a hollow shell around the earth if that's how you have it now. I'm just learning blender as well, so I may be way off, but hope this helps or sparks some ideas.