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April 28, 2013 Posted by Debi in All Articles, Grass, Neat tips, Replicators, Step-by-Step

Positioning grass or fur around objects

Description

Replicators are a great feature in modo allowing us to replicate an object multiple times using a fraction of computing resources. When it comes to grass or fur you can sometimes have a problem that is referred to as interpenetration. This is when you have say grass that grows around objects like rocks or pavers. .

Alessandro Masciari has written an excellent, detailed explanation of how to overcome this problem. But in a nutshell...

Note: this method was created during the 601 era. You can see Andy Brown demonstrating this example using procedural tools (at ~18 mins) using MODO 10.1
   
Step-by-Step
    • Place the grass into a Group
    • Create a replicator using the Grass group as Prototype and the ground item as the Point Source.
    • Hide the grass from the renderer by unchecking it under the Group tab
    Group tab
    • Create an Ambient Occlusion Render Output
    • Set the Frame to be square
    • Create a map and bake to render output
    • In the Shader Tree, inside the Ground material group, create a Surface Generator
    • Load the AO image into the same material group and change its effect to "Surface Particle Density"
    SurfParticleDensity
    • Under the Replicator Properties tab, substitute "Ground" with "Surface Generator"
    ReplicatoProperties
    Source http://kroncept.blogspot.com.au/2011/07/grass-around-objects.html
    Author  Alessandro Masciari

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    Tags: fur, grass, interpenetration, pavers, visibility