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//! Implements ray generation
//!
//! Rays are generated by transforming between different spaces summed below.
//!
//! - *World space*: Where objects are located in the scene, this will be 3d coordinates
//! - *Camera space*: Originated at the origin of the camera, with z mapped to the viewing
//! direction
//!
//! Camera space will be represented in different ways:
//! - *Screen space*: Everything in the screen space is projected onto the film, when z=0 this will
//! correspond
//! - *Normalized Device Coordinates(NDC) space*: Is defined as (0, 0, 0) as the upper-left corner of
//! the film, and (1, 1, 0) to be the bottom right corner.
//! - *Raster space*: Same as NDC space but, (1, 1, 0) is mapped to (width, height, 0)
//!
//! More in depth description is in pbr-book chapter 6
use crate::Float;
use crate::core::{Transform, Ray, Vector2i, Bound2f};
/// General implementation for all projective based cameras
struct ProjectiveCamera {
cam2wor: Transform,
cam2scr: Transform,
}
impl ProjectiveCamera {
fn new(cam2wor: Transform, cam2scr: Transform, resolution: &Vector2i, screenwindow: &Bound2f) -> Self {
let screensize = screenwindow.diagonal();
// Calculate the conversion from screen space to raster space
let scr2ras = Transform::new_scale(resolution.x as Float, resolution.y as Float, 1.0) *
Transform::new_scale(1.0 / (screensize.x), 1.0 / (screensize.y), 1.0) *
Transform::new_translate(-screenwindow.min.x, -screenwindow.min.y, 0.0);
let ras2scr =
Self {
cam2wor,
cam2scr,
}
}
}
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