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  1. #34

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    Another strategy for grunging things up and/or disrupting patterns is to find a nice, contrasty grunge image and apply it to the surfaces you want to change.

    Go to http://www.cgtextures.com and look up the grunge category. Find yourself some filth that looks good and save the large version. Open the grungemap you selected and play with the brightness and contrast until the areas you don't want to see are white. Place the map over the object you want to dirty up and crop it to fit. Set the mode to multiply (keeps dark areas and makes lighter areas transparent), and the grunge map will look like it's part of your floor.

    The attachments below should illustrate. The floor, the grunge, the modified grunge, and the two combined:
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	PlanksNew0019_L.jpg 
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ID:	3905   Click image for larger version. 

Name:	Grungemaps0001_L.jpg 
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ID:	3906   Click image for larger version. 

Name:	Grungemapcontrasty.jpg 
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ID:	3907   Click image for larger version. 

Name:	finished.jpg 
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ID:	3908  
    Bryan Ray, visual effects artist
    http://www.bryanray.name

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