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Operations
Every brush, generator and composite has an operation that says what it does to the geometry before it in the hierarchy:
| Operation | What it does |
|---|---|
| Additive | Adds its shape, and removes the geometry inside it |
| Subtractive | Removes all geometry inside it |
| Intersecting | Keeps only the geometry inside it: what it has in common with what came before |
Order matters: an operation works on everything before it in its branch of the hierarchy, so a subtractive brush only cuts the brushes above it, and an additive brush after it fills the hole again. Nothing is ever destroyed: you can change an operation, move a brush or reorder the hierarchy at any time and the level is rebuilt.
To apply an operation to several brushes at once, group them in a composite: see Hierarchical CSG.