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diff --git a/src/camera/camera.rs b/src/camera/camera.rs
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+++ b/src/camera/camera.rs
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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,
+        }
+    }
+}