My first post to the forum. I’m teaching myself to use Sketchup 2014, and as an exercise I decided to create a Hofstadter Monogram Cube. Like this.
If I were using the Pro version this would be trivial - it’s the intersection of three 3D Letters, G, E, and B. But Solid Tools>Intersect is not included in the Free version, and creating the intersection of two complicated solids is mind-meltingly difficult.
So I came up with a cunning plan…
Outer Shell is available in the free version, and is Union with internal geometry removed. So it should create a Solid Group.
It occurred to me I can turn a solid into “negative space” (I really loathe that phrase - I mean a “plenary solid” - an empty space inside a solid object) buy putting it inside a cube, which is equivalent to an invert (NOT) operator, and from that and Outer Shell (AND) I can use Boolean logic to synthesise the missing solid operators, including Intersection. i.e. A AND B AND C = NOT(NOT A OR NOT B OR NOT C)
But - when I tried it with two of the letters NOT(NOT G AND NOT E) the result was not a Solid Group.
I have no idea why. I can’t find a flaw in my reasoning. Please can you help.
Here is a Sketchup file of the of the three letters, each scaled to 100100100 and placed centrally in a 200200200 cube, and neatly lined up to make it easy to put them so that the outer cubes are coincident. (The font is Lucida Sans Typewriter Bold.)