Creating
Rivers in WorldBuilder 4: Adding External Perturbations
Our scene looks good, but its realism would be enhanced if the scattered
stones created some kind of disturbance in the water as it moves by.
We will recreate this phenomenon by applying a special kind of modifier
to our river.
With
River0 selected in the Scene Tree, right-click on External
Perturbations (in the Properties Tree) and pull down to
Add…
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In
the Select Type(s) of Object dialog window,
choose Cavity and click OK.
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The
Cavity Property Page displays several parameters: Cavity Geometry
defines the size and shape of the disturbance created by the stones.
Set
Length to 10.
Set
Central Angle to 45.
Set
Depth to 0.3.
For
the Allow Perturbations from control, enable River Area.
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Re-render
the scene once again.
Now
we can see that our rocks appear to be generating realistic
disturbances on the surface of the river.
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Now
let' s add a final touch: foaming 'white-water' .
We' re
going to apply this extra finishing touch as a special shader.
In the Properties Tree right-click on River0' s
Area1 (full) and pull down to Add…
In
the Select Type of Object(s) dialog window, choose
Material in Area from the Textures group and click OK.
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Now
we have a base upon which to build our new material.
Again,
right-click on the new Material in Area and pull down to
Add…
Select
Foam from the Object Dependant group and click OK.
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