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Stains, markings, etc.

C

CarlHill

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us-southcarolina
I know this is probably elementary, but does anyone know of a tutorial for creating apron stains like grease or oil? I'm using PSP photoX2 and the alpha blending is terrible. I paint stains/smudges on a transparent background, then create a mask from opacity and save it to the alpha channel. Then I use Image Tool to save as DXT3, or just a 32bit bmp. Either way, I get a whitish-gray haze surrounding the texture which does not blend in with the default concrete texture. This appears to be the result of the fading greyscale.

The only way I can get the mask to appear fully transparent is to use pure black which leaves too clean of an edge around the oil or grease stain. I seem to be unable to get it to "blend" into the concrete like it would naturally. I've seen this done in many sceneries, but after countless hours of experimentation, no joy here...

This is FS9 btw. I've spent 2 months on our humble KGSP and it seems like the little details are what is taking all of my time. If I could master this whole poly thing, I may even be able to create an authentic runway instead of relying on AFX's generic rendering.

CH:scratchch
 
Hi,

What I sometimes did in the past for mud on grass was the add some green (grass) colour around my mud. Then the fading will happen to the surrounding colour. So maybe you can add some concrete colour around?
 
I ended up doing mine by spray painting pure white on the pure black alpha. Control the flow by the density adjust and make it one step only. That way, whatever color you put in the foreground will bleed through the mask in proportion to the number and size of the holes...kinda like screen printing. Oh, and make sure to put "No shadow" and get rid of the specular.

Jim
 
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