Need Detailed Help Fixing Problem with Blender Software

Posted on 2012-08-30
Medium Priority
Last Modified: 2012-09-05

I am using Blender 2.6.3 running on a 64-bit Windows 7 PC to create a custom animation of the 20th Century Fox introduction.  Instructions on the process can be found here:


Note: This video will be for a family gathering, not for any commercial use.

The animation works well except for one problem.  There is a lot of flickering on one of the letters in the middle row.  I did some digging around and found my problem described exactly as items #37 and #38 in a list of Blender tips that can be found here:


37) Getting weird shading? Try selecting everything and recalculating the Normals before submitting a bug report. Get the toolbal by hitting T.
38) Still getting weird or flickering shading? Selecting everything and getting rid of duplicate vertices will fix this problem.

The challenge is I know nothing about how to implement the above suggestions as I have very limited (virtually no) experience using Blender.  

I am looking for a nice experienced Blender user who can provide me step by step instructions, complete with screen captures, how to implement these two fixes.

Here for reference are the settings I am using to generate this 20 second animation:

1920x1080 at 100%
Aspect: 1:1
30 fps

Anti aliasing checked - amount = 5
Shading: Textures, shadows, subsurface and scattering, environment map, ray tracing
Performance: fixed 24 threads
Tiles X=8, Y=8
Acceleration: Auto Instances checked
Post processing: Compositing, Sequencer, Edge threshold 1 are checked
Output: H.264 RGB
Encoding: Format: H.264 (lossless output NOT checked)
Bitrate = 6,000 (may want to bump to 8,000 when render again)
GOP size = 18
Rate: minimum 0, maximum 9000
Bake Mode = Full Render

The above settings took my brand new gaming PC about 12 hours to render 20 seconds!  You can understand how I do not want to try and fix this by trial and error.

As an aside, I have generated the file in AVI-jpeg (320MB) and AVI-raw (3.2 GB) at 1028x960 resolution.  With this resolution the animation rendered in about 5 hours.  The H.264 file format yielded an animation file that was only 14 MB!  The video was amazing - except for the flickering.

Thank you!!
Question by:MrChip2
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LVL 70

Accepted Solution

Merete earned 2000 total points
ID: 38353001
Hello Mrchips2 hows the new computer :)
I can't help you with Blender sorree.
But just thought I'd say hello.
Impressive tool
here's what I sourced
FIX: Flickering letters in Blender renders
After you've edited the TEXT
Rightclick it to select it then press ALT+ C
and left click on Mesh,
then rightclick the lower text press ALT+C and then click Mesh
This should fix the flickering problem when rendering
Video Source
hope it helps.
You may need to reload the project in order to do this, hopefully you saved it at stages.
Regards Merete

Author Comment

ID: 38355382
Hi Merete,

Good to hear from you.  The new computer is great!  I am just now starting to use it on a more regular basis.  I am using it for this Blender project.  It blows away my XP machine and is much faster than my other W7 PC.

I did save the project in stages and will try what you suggested.

I was originally saving the file as an AVI-jpeg at 1280x960 resolution.  The final file was 310 MB  or so.  I was shocked when I switched to H.264 1920x1080 and ended up with an amazing video (except for the flickering) that was only 14MB!  I will let you know if your idea works.  Even on my new PC, this 20 second movie will take probably 8 hours to render in HiDef.  On my XP machine the movie took something like 28 hours to render at the much lower 1280x960 resolution.  If you go strictly by image size, I would estimate the video in HiDef would have needed 44 hours on my XP machine (assuming it did not crash).
LVL 70

Expert Comment

ID: 38356252
Unbelievable?? Is that normal?
Are you using 2 pass?
1 pass should be sufficient if that is the case. Would reduce the time and size.
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Author Comment

ID: 38357496
I am not sure if I am using 2 pass - but my times are consistent with what others post.  Most comments on the original posters video complain of rendering times of 24 hours plus.  

I have enabled anti-aliasing and some other feature (name escapes me) that help smooth the animation but increase render times.  

The good news is I am 20% into my second and final animation.  Your easy to follow advice worked!  My first animation rendered without a single flicker and the IQ is great now that it is high-def.  

Thanks so much!!!
LVL 70

Expert Comment

ID: 38357926
Awesome to hear Mr Chips, glad to have helped lol just goes to shows a base knowledge does help with most tools just have to know what to look for then the rest will follow.
At this rate you won't use your new PC much with all that rendering time :P

Author Closing Comment

ID: 38366936
Thanks for the great help!

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