1.8

## Pompeu Fabra University Barcelona

Skip to 0 minutes and 19 secondsHi. In this video we are going to talk about 3D objects In the previous video we talked about the cameras, but now that we know how to handle the cameras, we need to fill our 3D environment with objects. So, for starters, I’m going to start with a very simple object, in this case, a 3D sphere. So we have a sphere here. The first thing you have to keep in mind when we work with 3D objects is that every single object that we render on a 3D environment is usually made by triangles. It’s hard to see when you look at this sphere right now, but, just to show you, you could see that this sphere is made by all these points.

Skip to 0 minutes and 57 secondsIf we connect every single one of these points with its neighbours we will have this shape, in this case, all these tiny triangles. And, if we fill these triangles with an adequate shading, we will have something more similar to the sphere we had before. So, even if you see any kind of complex shape, they are always made by triangles. The more triangles we have, the more complex shapes we can have. So, instead of using this sphere, I’m going to import a different kind of object. So, usually when you want to have 3D objects in your scene, you have to load them from a 3D file. In this case I have here some files with different shapes.

Skip to 1 minute and 41 secondsI’m going to drag, for instance, this object here. I’m going to insert it in my scene. So this is like a cup and, as I said before, it’s a 3D object but, as I said, it’s made by all these points that define the vertices of the mesh and if you connect all of them you have the 3D mesh. But, because we are going to fill it, we are going to have this nice cup. I’m going to drag another one, in this case, like this one. This is a teapot. I’m going to insert it here.

Skip to 2 minutes and 13 secondsSo now we have two objects, but the problem we have here is that both objects are using the same 3D space, so they are overlapped and we don’t want that to happen. So, when you have 3D objects, the next thing you have to keep in mind is move the objects around and you should apply some transformations. To do so, usually there is different actions that you can perform. In these 3D environments, the best way to move objects is using these tools over here. In this case, this tool is the move tool. This kind of shape you are looking right now on the screen is called the gizmo and helps us to move objects around.

Skip to 2 minutes and 48 secondsSo, in this case, if I want to move the object in that direction, I put the mouse on top of this axis and I drag it, ok? And if I want to move it up or down, I can move it up and down. But, if I want to make the scene like the teapot is pouring tea inside the cup, I need to not only move the object around, I also need to rotate the object. So, for rotating, there’s also these gizmos. I can click in this gizmo, I can drag it, and now I have like this teapot. more in slope.

Skip to 3 minutes and 22 secondsAnd finally there’s another very common transformation which is called scale that allow us to take any object and change the size of the object, ok? So I’m going to leave it like this. So this is the way that we can fill our environment. We drag new files, we move them around so we can create our scene. If you want to create these 3D files, there are different softwares to create new meshes, or you can go to the internet, there are many databases where you can download new 3D files. But you have to keep in mind that every 3D file comes with a different file format.

Skip to 3 minutes and 56 secondsSo, in this case, I’m using .obj, which is a very standard format for 3D meshes, but there are many other formats and every application maybe or maybe not supports this 3D mesh. So, in the next video I’m going to be talking a little bit more about lights, so you understand better how to set up your scene.

# Learn about 3D objects

In this video, Javier discusses how you can load 3D objects into your scene. As he explains, you can change the properties of an object to make it look more sophisticated.

Some important aspects to practice are:

• Loading objects into a scene
• Moving objects
• Rotating objects
• Scaling objects.

You can download 3D assets from following websites:

## Get a taste of this course

Find out what this course is like by previewing some of the course steps before you join: