what causes this "noise"?

hi all, after a quick render, i noticed that some of the planes had gotten all “noisy” on me. what causes this and how can i fix it?


cheers

steve

Most likely overlapping faces. Did you duplicate your object or mesh. To remove duplicate vertices select all and W/ remove doubles. To check for duplicate objects select the object, move it and see if there is anything underneath it

Since you didn’t bother to attach or post a link to your blend file, the answer cannot be specific for your particular case

Thanks for the reply, i tried what you suggested, but blender reported no duplicates.

here is the blend file in case you want to take a look:

faster download: media-hunter.com/test.blend

thanks

steve

*** Moderation ***
Moved from Tutorials, Tips and Tricks
as it is a support request

You have duplicate objects over lapping each other. Just grab that wall and delete it.