Справка Houdini на русском Geometry
Use the 
Boolean tool on the Model tab to combine, intersect, or subtract the surfaces of two objects.
Use the 
Combine tool on the Modify tab to merge the geometry inside two Geometry container objects into one object.
See the help for the Modify tab, Model tab, Polygon tab and Deform tab for more modeling tools.
Describes how Houdini represents geometry using details, primitives, points, vertices, and attributes.
In Houdini you can not only edit the parameters of a surface node, you can reselect the geometry the operation applies to.
Tools on the Polygon tab let you modify polygons in the scene view.
Tools on the Model tab let you edit objects in the scene view.
The appearance editor mode of the data tree pane lets you edit various controls for object viewport/rendered appearance in one place.
You can mark a chain of compilable SOPs as a compiled block which can execute much faster in parallel.
