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Hi everyone, this is rprentki with another tutorial video for EyeWire.

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This is going to be fourth practice cube after you finish the tutorial cubes.

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So remember, you're not going to get feedback while you work.

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You will afterwards, and you'll get some points.

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Let's get started.

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Okay, so our starting piece is a little bit odd.

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Notice that there's a dark shadow underneath the blue.

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So, what I'm going to do is just go back and forth 

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a time or two, just to get an idea of what we're dealing with.

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That is odd looking.

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Let's color that in and see what it looks like.

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Okay, so now, looking at this in the 3D,

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this looks pretty wrong doesn't it?

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Let's zoom in a little bit.

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See how it looks like the dark blue branch is going in one direction and if we look at the light blue one, 

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it looks like it is part of a different branch, sitting on top.

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It's sitting up there like a lump on a log, and that's not what we want --- 

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we want it to be a nice and smooth continuation.

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So clearly that was a tricky little part we started on, so let's get rid of that, 

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and remember in the 3D, you can do that with control-click.

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Let's get rid of that, and then let's get rid of these little blue pieces as well.

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Okay, so that was challenging.

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Let's go back and see where we went wrong.

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Okay, so, if I scroll a little bit,

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this still looks normal, normal, normal . . .

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Okay, so here's where we went wrong.

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Sometimes, when it's disappearing, the piece of the neuron you're working on, 

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it will fade into a dark shadow.

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And that's what it's doing here.

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And if I hit shift to get rid of the color,

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you can see that a lot clearer,

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so this right here is still sort of part of the other one,

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and that's why its colored in.

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But this light part right here . . . 

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is actually a part of a different neuron,

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and that was the light blue one that was sitting on top of the dark blue.

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So we don't want to color this in, so don't color that in.

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Let's go the other way now, 

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and that can be really difficult if not impossible to figure out with the 2D alone.

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So that's why its really important to see what you're adding in the 3D as you go.

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So if you're adding what you think is going to be a small piece on top,

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and then you see something that appears like that did, 

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where its just clearly another neuron, make sure you get rid of it.

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Okay, so I'm going to watch this little piece first,

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for it to disappear.

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Okay, that's off the edge, so now we're going back up, 

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and let this rejoin.

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Okay, I'm going to turn this over in the 3D, 

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so I can see what we're looking at.

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Alright, I can see that this little branch that's right here ---

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Let me go back a little bit, 

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I want to see where that started.

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Okay, so this is where that is branching off,

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and it looks like it ends really soon, so we're going to follow this one first.

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Okay, and, a little piece to add right here . . .

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And I think we're done.

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and when I come across a branch point like that, 

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I like to make sure I follow the smaller one first, 

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the one that will end sooner, or the one that is 

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going to be harder to find in the future, 

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because that will be the one I'll be more likely to miss.

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And we're almost done now.

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Okay, looks like that disappeared.

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We're done, good job.