This is a quick overview tutorial of the Torus primitive in the Away3D TypeScript library.
We will be recreating the scene as seen above.
To use a Torus primitive, we’ll need to:
- Declare, instantiate, and initialize a new Torus object.
- Declare, instantiate, and initialize a new Mesh object.
- Assign the Torus object to the Mesh object.
- Add the Mesh object to the scene.
This tutorial builds off of the Away3D TypeScript: Template. All the new or changed code will be highlighted in the full code block below.
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Line 15 declares a variable named _objectMesh of type Mesh().
Line 53 instantiates a new Mesh() object referenced by the variable _objectMesh. Then _objectMesh was initialized by calling the getNewObject method on a new PrimitiveTorusPrefab object that was cast-typed to type Mesh. We’ll discuss the values passed to the prefab later.
Line 54 adds the Mesh object containing the defined prefab geometry to the scene.
Lines 67-68 adds a spin to our Mesh object on every frame of animation.
That’s it, our object is in the scene.
However, we glazed over the initialization process, let’s take a closer look at the object’s constructor.
The constructor looks as follows:
PrimitiveTorusPrefab(radius:Number = 50, tubeRadius:Number = 50, segmentsR:uint = 16, segmentsT:uint = 8, yUp:Boolean = true)
The Constructor’s Parameters:
- radius:Number (default = 50) — The radius of the torus.
- tubeRadius:Number (default = 50) — The radius of the inner tube of the torus. (Lower number makes a thin ring. Higher number makes a thick doughnut.
- segmentsR:uint (default = 16) — Defines the number of horizontal segments that make up the torus.
- segmentsT:uint (default = 8) — Defines the number of vertical segments that make up the torus.
- yUp:Boolean (default = true) — Defines whether the torus poles should lay on the Y-axis (true) or on the Z-axis (false).
So in our initialization we stated:
this._objectMesh = <away.entities.Mesh> new away.prefabs.PrimitiveTorusPrefab(250, 50, 16, 8, true).getNewObject();
Which created a Torus:
- With a radius of 250 units.
- With a tubeRadius of 50 units.
- 16 segments along the horizontal axis.
- 8 segments along the vertical axis.
- We said true to that the plane’s normal vector should point along the Y axis.
Adding a basic primitive is relatively easy. Just understanding the constructor and what the parameters are, is the hardest part. You can look at the official documentation here.