Need some grunge realism techniques for an old concrete wall

[vanderloo]

I'm messing around with some textures to try to get a good, realistic effect for an old concrete wall.
Wondering what is the best way to apply a moldy, grunge look at the bottom of the wall like the attached image.
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Thanks All and Happy Holidays!

[glorybound]

I'm messing around with some textures to try to get a good, realistic effect for an old concrete wall. Wondering what is the best way to apply a moldy, grunge look at the bottom of the wall like the attached image. <img src="http://forums.chaosgroup.com/attachment.php?attachmentid=27735"/> <br> <img src="http://forums.chaosgroup.com/attachment.php?attachmentid=27736"/> Thanks All and Happy Holidays!

have you checked out rich dirt, which is a plugin?

[vanderloo]

No I haven't heard of that. But I will now.
Thanks Bobby.
Merry Christmas

[^Lele^]

You could simply use a gradient ramp to mask the grungy textures in at the bottom, no need for a plugin (which will add to rendertimes, in case of richdirt, which is like Vray's AO, by now. It was unique five years ago or so...)

[Deflaminis]

I'm a big fan of Quixel suite and Substance, also options.

[joconnell]

You could simply use a gradient ramp to mask the grungy textures in at the bottom, no need for a plugin (which will add to rendertimes, in case of richdirt, which is like Vray's AO, by now. It was unique five years ago or so...)

They've got that very sneaky thin surface stuff though which is great

[Joelaff]

You can certainly do it with VrayDirt used for masking, and mix in some Gradients, possibly use some texture displacement with Bercon.

But, it would likely be faster (and almost definitely a little faster to render) if you just painted some maps real quickly in Photoshop, or even used some photo maps as mattes, etc.