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How would anybody go if you have a model and you use it as a displacement texture, but the ground to be separated from the model (not literaly separated, but to distinguish the ground from the model)? Maybe the boolean can solve the problem, but of big curiosity, what are some of the ways and approaches of doing that?

I'm aiming for this kind of result - enter image description here

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I'm still not sure what you are asking.. What do you mean by "if you have a model and you use it as a displacement texture"? What do you mean by ground? –  gandalf3 Jun 10 at 19:19
    
What I mean is - If you bake a displacement texture of the model on a plain and then add a displace modifier to the plain and then when you apply a material on it, I don't want the hole plain to be with that texture, just the formation that forms from the displacement modifier witch is the yellow thing show on the image above. –  Vladimir Jun 10 at 19:38
    
The formation and the parts that are supposed to act as a ground don't have to be on a same mesh. –  Vladimir Jun 10 at 19:42
    
Oh.. I see now, partially. Though how do you want the displacement to be separated from the plane? Also, do you have any particular reason you want to use a displacement? Why not put a plane under (or through) the existing model? –  gandalf3 Jun 10 at 19:43
    
I thought of that too, but the material will still be visible underneath. thanks anyway –  Vladimir Jun 10 at 19:45
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1 Answer 1

up vote 3 down vote accepted

use an image to control the displacement: enter image description here

enter image description here

Generate an image that controls an alpha channel for texturing

enter image description here

Use that image to combine different materials:

enter image description here

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Cool, thanks. Any video links on how to generate an alpha texture/map? –  Vladimir Jun 10 at 20:46
    
bytheway - The materials are on a same mesh or separete? –  Vladimir Jun 10 at 20:50
    
For the displacement texture I just used your the image you posted and replaced the gray background with black in photoshop. . To create the alpha I selected the background, inverted the selection (to select everything but the background) and filled it with white. –  cegaton Jun 10 at 20:51
    
Just one plane mesh is used. –  cegaton Jun 10 at 20:52
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The base image used was from the OP previous question: blender.stackexchange.com/questions/12116/… –  cegaton Jun 10 at 20:59
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