Subtitles of the Movie

The final piece of the puzzle, so to speak, in SketchUp when it comes to geometry modification is the Intersect function. And the Intersect function is really very much like a Boolean function that you would find in other graphics applications like Adobe Illustrator or Adobe Photoshop, or Corel Painter and the idea with the Boolean functions is that you can take two or more objects and you can combine them or cut them from each other to weed out your intersecting shapes and I'll show you what I mean. The first thing to notice about this sphere and this modified cube that I have for a base is that even though they're touching one another they're not currently sharing any edges, as you can see here, there are no edges. Now this means that these two objects are not, in fact, joined. They are simply, as you can see here, just touching one another, but we want them to be joined in this first instance. Now the other thing to note is when we're looking at this particular demo if we go ahead and hide you'll see that on this first one I don't have one of these five-sided pyramid shapes embedded inside the circle and there's a reason for that and I'll show it to you in a second. But each one of these is locked and these cannot be accessed right now and the way that you lock an object is by selecting it and you go to Edit and you go to Lock. Now right now it's grayed out because we don't have anything that we can lock, but in this particular instance that's how you would get that little red cage around an object. Now, what I'm going to do is I'm going to go ahead and unhide all those spheres that I set up and I'm going to go ahead and we're going to triple-click each of these objects and we're going to run an Intersect operation all at once so that you can see that these are all identical and they were done in the exact same way. So we're going to go to Edit, Intersect, Selected Only. And once we've done that, there we go, now it's rendered. Now you see that there is a shared edge here and this shared edge is actually saying, OK, now these pieces of geometry are now connected to one another. They are, in fact, as far as SketchUp is concerned, one object. In this particular instance what I'm going to do is I'm actually going to hide this top sphere and I'm going to delete this edge right here and that's going to allow me to get rid of that extra geometry so that when I unhide that sphere again you'll see that now we don't have extra geometry inside that we don't need. On this second one I'm simply going to do the same thing but in this particular instance I'm going to leave the sphere deleted and this will be analogous to a subtract function in your normal Boolean operations, meaning that we've subtracted the sphere from this base cube shape and we've revealed the object that was hidden inside. Alternately, what we can do is we can actually subtract the base and what I'll do here is I'll simply delete these edges, like so and I'll zoom in so that I can get this little crescent, delete that and now you can see that shape that's embedded inside. The third resulting shape that you can choose to keep would be by deleting this and deleting this and only keeping the intersecting shape of where those two shapes had shared space together in terms of 3D geometry and so by doing one function we can have four different results, if you count the Unite function, which is what this would be. So this would be a Unite, this would be a Subtract the sphere, this would be a Subtract the base and this would be an Intersect functionality. Now, that's not really all that important because they're all basically an Intersect function when you're working in SketchUp, but it helps to think about them and give them names that are descriptive of what you're trying to achieve when you're thinking through your process of how you're going to use the Intersect Tool.