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So now we understand the basics of the Pencil tool and we can actually draw 2D and 3D objects with it, but let me show you some more things that you can do. I am going to start with this box. Once we have a simple box here, we can still continue with our Pencil tool. We can actually draw additional details onto surfaces. So for example, in addition to just snapping to places in space, we can actually snap to faces and edges. If you notice here, if I move that Pencil tool long we have an end point, we have the mid-point which is the halfway point between these two ends of this edge, and we also have another end point.
So if I want to, I could snap to this mid -point and just draw a line along here. If I wanted to, I could just draw one here from mid-point-to-mid-point. What I've got now is I've got two faces. If I hit my Spacebar, you see I have actually divided this into two separate faces, if I delete one of those faces, you can see I can create a hole in that box, or I can just use the Pencil tool to extend that. So let's say I wanted to just make an addition to this box. Again, just use my Pencil tool and just draw it out.
So again, I am drawing lines on to faces. Now if you notice, we've created a number of different edges here. If you want to, you can delete those and they'll actually, basically go away and make this into one face. So if you look on this side here we've got two faces, but if we want this to be one continuous face, we can just hit the Delete key there and that will do that and we've got one again on the bottom here that we can play with. So now we've got a continuous object here. Now if I want to, I can add additional detail just by drawing within these faces. So for example, here let's say I wanted to make a vertical extension. I can just essentially draw a box, and again using your inference you can make sure that you've got a square, now everything is a right angle here, I think you just draw it vertically.
And again, all I am doing is just sketching things out with this Pencil tool, and you can see how powerful it is. We are creating some very complex shapes just using a very simple tool. So you can see how you can very quickly add on to whatever you've created and just literally starts sketching in mid air, whatever sort of 3D shape you want. So enough of that, let's go ahead and I want to show you some additional things. So I am going to hit Delete here, and just select everything and delete it. And now I am just going to sketch out a simple rectangle which we are all familiar with by now.
Now one of the things you have to be careful about, when you are drawing lines of faces is how they intersect. So for example, if I draw one from here to here, then I've got an edge here that has basically I selected this into two separate triangles. Now if I did the opposite, let's say I wanted to divide this into four. Now your first instinct would be to draw from this point to this point. But what that does is it actually just creates a line from that point to that point because you are not intersecting this line here.
So if I selected this edge and I moved it, you can see how it actually kind of creates almost like a tetrahedron, it doesn't really create a flat plain with four sub-divisions. So actually I am going to undo my way out of that by hitting Ctrl+Z, go back to my Line tool, and if I want to sub-divide this into four pieces, I have to stop here at this mid point. So what I do is I go to this line and then just I find where it snaps to that mid-point and then I draw another line. So I have actually drawn two lines, so I've got one, two, three, four and now when I move some points here. If I Shift+Select these edges and move them downward, you can see how I can create a pyramid. So you can create angular shapes as well just by moving those edges.
Now the one thing about SketchUp is you really can't move vertices. In another 3D application you might just want to select that one point at the top and move it up, but that's something you really can't do in SketchUp, you have to actually move the edges, so that's why I move these edges down rather than this point up to create that pyramid. So those are some additional ways to use the Pencil tool.
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