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The union operation just glues objects together, it does not remove the objects' surfaces inside the union.
Under most circumstances this does not matter. However if a transparent union is used, those interior
surfaces will be visible. The merge operations can be used to avoid this problem. It works just like union
but it eliminates the inner surfaces like shown in the figure below.
The syntax is:
MERGE:
merge
{
SOLID_OBJECTS...
[OBJECT_MODIFIERS...]
}
The component objects must have well defined inside/outside properties. Patch objects are not allowed.
Note: that in general merge is slower rendering than union
when used with non transparent objects. A small test may be needed to determine what is the optimal solution regarding
speed and visual result.
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