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use crate::vector::Vec3;
pub trait Camera
{
/// Returns the camera position.
fn position(&self) -> Vec3<f32>;
/// Returns the position of the camera target.
fn target(&self) -> Vec3<f32>;
/// Returns the direction the camera is looking.
fn direction(&self) -> Vec3<f32>
{
self.target() - self.position()
}
/// Returns the right direction relative from where the camera is looking.
fn right(&self) -> Vec3<f32>
{
self.direction().cross(&self.global_up()).normalize()
}
/// Returns the left direction relative from where the camera is looking.
fn left(&self) -> Vec3<f32>
{
-self.right()
}
/// Returns the upwards direction relative from where the camera is looking.
fn up(&self) -> Vec3<f32>
{
let rev_direction = -self.direction();
rev_direction.cross(&self.right())
}
/// Returns the downwards direction relative from where the camera is looking.
fn down(&self) -> Vec3<f32>
{
-self.up()
}
/// Returns the global direction upwards.
///
/// The default implementation which returns [`Vec3::UP`] should be fine in most
/// cases.
fn global_up(&self) -> Vec3<f32>
{
Vec3::UP
}
}
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