Operation – Add or RemoveĪdjusting the behaviour of the Boolean modifier, whether it adds or removes material, depends on the Operation setting and the interaction between both ‘target’ and ‘operator’ objects. Once the Boolean Object is set, in the modifiers properties it can be used to transform the mesh to which the modifier is assigned, adding or removing material as needed, just click and manipulate into position in the 3D View as a normal object. With object selected in the 3D View the Boolean Modifier is assigned – this is the object to be affected by the operation with the removal or addition of material (mesh structure). Some experimentation may be necessary to achieve the correct effect if the operation is to close the mesh entirely. This sets the change and removes the modifier from the Modifier Properties stack (panel).ĭesign note: depending on the target objects structure Blender will make a best effort attempt to ‘close’ the mesh and fill gaps caused by Boolean, else leave the modification ‘open’ (unfilled) – the target mesh being closed or open before being modified has little bearing on the end result.Ī sphere set as the Boolean shape removed from a target object illustrates how Blender 2.8+ will attempt to ‘close’ the mesh wherever possible but may leave a majority ‘open’ because it cannot be reasonable resolved. When done, select the object being affected by the Boolean operator and in the modifiers properties ( Modifier Properties) click the Apply button. Once set, in the 3D View select the operator object and position it relative to the Boolean operation desired. Here click the Mesh object to use for Boolean operation input field under Object and select the mesh to use. This assigns a modifier instance to the object and populates the properties panel. Object otherwise comprising multiple meshes may need to be joined into a single mesh before assigning Boolean as the Modifier only operates on the (active) object to which the modifier is assigned. To use Boolean then, in Object Mode select the object (mesh) that is to be affected by the tool then in Modifier Properties select Boolean from the Generate options column.ĭesign note: subject to Boolean Multiple Meshes below, Boolean applies to one target object at a time, a single mesh selection or the Active object in a group so removing or adding material where multiple objects would otherwise be the case, requires they be joined together ( Ctrl + J) beforehand into a single unified object. Boolean Modifierīoolean requires a target object, an object from or to which material is to be removed or added, and an operator, a shape that essentially acts as the cutting element. In addition, aggressive use of Boolean can cause non manifold mesh issues and/or Blender to crash.īoolean operations require a ‘ target‘ object (green and pink blocks above) that is affected by the modifier, and an ‘ operator‘ that determines what happens and where (default Cube primitive shown above in Wire mode for clarity – Object Properties » Viewport Display » Display As » Wire – although the operator can any shape or form of object). Important: Boolean operations have a tendency to produce unusually messy meshes often requiring significant cleanup or (re)optimisation afterwards. In this way Boolean can be used to create positive or negative shapes or make additive or subtractive cuts.ĭownload: KatsBits – boolean.zip | c. Similar to Knife cutting a mesh and Bisect slicing selections, Boolean provides another means to add or remove material from a mesh or object, the target, using another, the operator, that defines what gets removed and where – poking the corner of a cube (operator) into a sphere (target) leaves an impression of the cubes corner in the sphere wherever they intersect.
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