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Skill Level Beginner
- [Instructor] Hi, I'm George Maestri. Today we're going to take a look at vertex painting and geometry. Now if you've used vertex painting before, you'll understand it's a great way to organically apply materials to your objects. You can paint multiple materials with one brush. But the underlying geometry will affect how your vertex painting happens. So let me show you it with this simple example how to best organize your geometry for vertex painting. Now if you're unfamiliar with vertex painting, let's just go through a real brief tutorial. I've got these objects here, and they all have the same material. So I'm going to select this one on the far right. And let's go into our Paint interface here, make sure we have colors, and then make sure that our paint color is white and black. And then I'm going to set my brush radius to about 25, make it a fairly small brush for this scene. Now with this object on the right selected, you can see that as my brush hovers over the object, I can left-click and I can start painting in grass over this ground color. And that's really cool. Now each of these has the same material, so I should be able to do the same for each. So let's go ahead and left-click on the one on the far left. Now as I start painting, you'll see that, well, nothing's happening until I hit a certain spot there. If I paint, say, around here, again, nothing is happening. And then all of a sudden, there's the color. Now why is this happening? Well, you can see it very easily if we just switch over to Wireframe. So I'm going to go ahead and deselect all of my objects, go into Wireframe, and you'll see that the only difference between these objects is the level of detail, or how much geometry we have. Now remember, this is called vertex painting. We are actually painting the vertices in these objects. So when my brush goes over a vertex, that's when the values are changed and the material appears. So this makes it pretty obvious what's happening, is that when I go over a specific vertice, then the color is applied. Now as you can see, the only on the right is very interactive and we're getting a really great result. The one on the left, not so much. Now when we work with game engines, we are always trying to keep our geometry as light as possible, so that way, things operate smoothly. So what you need to do is make sure that you have enough detail to paint, but not so much detail that you're bogging down the scene. And that's going to be different for every single scene. Now I have an object here in the middle with slightly more geometry than on the left and slightly less than on the right. In fact, it's in the middle. And as you can see, we're getting a pretty good result with this. So again, if we take a look at the wireframes, you'll see that this particular object has enough vertices so that we can paint, but not so much that it bogs down the scene. So when you do vertex painting, be sure to have enough geometry so you can actually paint vertices.