Here begins the second module inside the "Creation of Video games: Art and technology" course. Video games technology. This module's contents are: Kinds of primitives, Renderable Vertexes, ASE Files, Bounding Box and bounding spheres, Textures, Scenario, Physics and Items. In Ignite11 we will be able to paint different primitive types, that is, different formats and how we are going to paint geometry in our video game. The two kinds of primitives we are going to use are lines and triangles, which are the most used, especially triangles. Inside each of those kinds of primitives we can find the stripified lines and the lines list. And on another side the list of triangles and stripified triangles. How does this work? The triangles list is defined this way: first we define 2 vertexes and we paint a line. This would be the first list, the first line in a list of lines. The second line would be defined by the next two vertexes. They will define this second line. The next couple of vertexes is the third line. So we will need as many vertexes as vertexes are found in the lines. So in this case we've got 3 lines, 2 vertexes per line. That makes 6 vertexes. For the stripified lines, the creation process is different. If we have the same 6 vertexes we saw in the previous case, stripified lines work this way: with the two first vertexes we create a line. With the last and the new vertex, we create another line. With the last vertex and a new one we create another line. With the last and a new vertex we create another line and with the last one and the new vertex we create another line. This would be the case of stripified lines. For the triangles it will be something similar. In this case we are going to create 3 vertexes in our space. Now we are going to paint the triangle composed by those 3 vertexes. The next 3 vertexes will define the next triangle. This would be a linear list of triangles. So we will have 3 vertexes per triangle, so if we have 2 triangles as in this case we will need 6 vertexes to paint two primitives in the triangles list. In the case of the stripified triangles, it is similar to the stripified lines. A beautiful aspect. We will paint a triangle in three vertexes. A fourth vertex, a fifth vertex, and a sixth and a seventh vertex. In the case of stripified triangles, the first 3 vertexes define our first triangle. The last 2 vertexes plus the new one define another triangle. The last 2 vertexes plus the new one define another triangle. The last 2 vertexes plus the new one define another triangle. And the last 2 vertexes plus the new one define another triangle. So in this case we have used 7 vertexes to paint 5 triangles. Those would be stripified triangles. stripified triangles are more efficient when painting than lists of triangles. However, we will use triangle lists as they are more comfortable and easier to create. It's true that stripified triangles have a very common use in a kind of rendering or effect that is very used in video games. In this case the effect used for stripified triangles is the light beams. In example, let's imagine we have a sword. Sorry for my bad drawing skills. We've got a sword. We can give it a light beam, a sword with an aura. So we will have this sword in different moments. This will be the time 0. This will be the time 1, this will be the time 2. For each of those moments we will choose the same points of the sword. And we are going to take the two vertexes of this sword. So through stripified triangles we will paint the two first vertexes and the third one of the ones we have created, we will paint a triangle. With the last two ones and the new vertex, we will paint another triangle. With the last two ones and the new vertex, we will paint another triangle. With the last two ones and the new vertex, we will paint another triangle. This means through striped triangles we can create the halo left by a sword on the air in a video game. So this would be done through stripified triangles. As I show you here.