# Objective
The `Rectangle` and `Cuboid` primitives currently use different
representations:
```rust
pub struct Rectangle {
/// The half width of the rectangle
pub half_width: f32,
/// The half height of the rectangle
pub half_height: f32,
}
pub struct Cuboid {
/// Half of the width, height and depth of the cuboid
pub half_extents: Vec3,
}
```
The property names and helpers are also inconsistent. `Cuboid` has
`half_extents`, but it also has a method called `from_size`. Most
existing code also uses "size" instead of "extents".
## Solution
Represent both `Rectangle` and `Cuboid` with `half_size` properties.
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