okay, code complete enough. Done with it now.

Video in rust is a GIANT pain. A gif gets the same point across.

project/Cargo.toml

@@ -5,5 +5,6 @@ edition = "2024"
 
 [dependencies]
 anyhow = "1.0.104"
+image = "0.25.10"
 minifb = "0.28.0"
 nalgebra = "0.35.0"

project/src/main.rs

@@ -195,12 +195,12 @@ fn init() -> AnyResult<ng::Matrix3x4<f64>> {
 }
 
 //Returns (u,v)
-fn convert_3d_to_2d(m: &ng::Matrix3x4<f64>, x: f64, y: f64, z: f64) -> (i32, i32) {
-    let dim_3 = ng::Matrix4x1::new(x, y, z, 1.0);
+fn convert_3d_to_2d(m: &ng::Matrix3x4<f64>, point: &Point3d) -> Point2d {
+    let dim_3 = ng::Matrix4x1::new(point.x, point.y, point.z, 1.0);
 
     let dim_2 = m * dim_3;
 
-    ((dim_2[0] / dim_2[2]) as i32, (dim_2[1] / dim_2[2]) as i32)
+    Point2d::new((dim_2[0] / dim_2[2]) as i32, (dim_2[1] / dim_2[2]) as i32)
 }
 
 const WINDOW_HEIGHT: usize = 480;
@@ -216,47 +216,28 @@ fn main() -> AnyResult<()> {
         fb::WindowOptions::default(),
     )?;
 
-    let mut x = Vec::new();
-    let mut y = Vec::new();
-    let mut z = Vec::new();
+    let mut points_3d = Vec::new();
 
     for i in 0..(10 * 10) {
-        // Constant 0
-        z.push(0);
-        // x will count up, the reset every 10
-        x.push(i % 10);
-        //y will only count up once every 10
-        y.push(i / 10);
+        points_3d.push(Point3d::new((i / 10) as f64, (i % 10) as f64, 0.0));
     }
 
     for i in 0..(10 * 10) {
-        // Constant 10
-        y.push(10);
-        // x will count up, the reset every 10
-        x.push(i % 10);
-        //z will only count up once every 10
-        z.push(i / 10);
+        points_3d.push(Point3d::new((i % 10) as f64, 10.0, (i / 10) as f64));
     }
 
     for i in 0..(10 * 10) {
-        // Constant 10
-        x.push(10);
-        // z will count up, the reset every 10
-        z.push(i % 10);
-        //y will only count up once every 10
-        y.push(i / 10);
+        points_3d.push(Point3d::new(10.0, (i % 10) as f64, (i / 10) as f64));
     }
 
-    let (u, v) = x
+    let points = points_3d
         .into_iter()
-        .zip(y)
-        .zip(z)
-        .map(|((x, y), z)| convert_3d_to_2d(&m, x as f64, y as f64, z as f64))
-        .collect::<(Vec<i32>, Vec<i32>)>();
+        .map(|point| convert_3d_to_2d(&m, &point))
+        .collect::<Vec<Point2d>>();
 
     let mut buffer = vec![0 as u32; WINDOW_WIDTH * WINDOW_HEIGHT];
 
-    update_buffer_with_pixels(&mut buffer, u, v);
+    update_buffer_with_pixels(&mut buffer, points);
 
     //Clone this, so we can clone this back into buffer later, for each frame. So we can keep the BG pixels.
     let background_buffer = buffer.clone();
@@ -264,29 +245,52 @@ fn main() -> AnyResult<()> {
     window.update_with_buffer(&buffer, WINDOW_WIDTH, WINDOW_HEIGHT)?;
     window.set_target_fps(30);
 
-    let mut frame = 0.0;
+    let trb = Point3d::new(1.0, 1.0, 1.0);
+    let trf = Point3d::new(0.0, 1.0, 1.0);
+    let tlb = Point3d::new(1.0, 1.0, 0.0);
+    let tlf = Point3d::new(0.0, 1.0, 0.0);
+    let blf = Point3d::new(0.0, 0.0, 0.0);
+    let blb = Point3d::new(1.0, 0.0, 0.0);
+    let brf = Point3d::new(0.0, 0.0, 1.0);
+    let brb = Point3d::new(1.0, 0.0, 1.0);
+
+    let mut cube = Cube::new(trb, trf, tlb, tlf, blf, blb, brf, brb);
+
+    let mut gif_buffer: Vec<Vec<u8>> = Vec::new();
+
+    let mut x_trans = 0.0;
+    let mut y_trans = 0.0;
+    let mut z_trans = 0.0;
+
+    const X_TRANS_RATE: f64 = 1.0 / 30.0;
+    const Y_TRANS_RATE: f64 = 0.5 / 30.0;
+    const Z_TRANS_RATE: f64 = 2.0 / 30.0;
+
+    const MAX_TRANS: f64 = 6.0;
 
     while window.is_open() {
         //Reload the background for each frame
-        buffer = background_buffer.clone();
+        let mut buffer = background_buffer.clone();
 
-        let u = vec![0; 0];
-        let v = vec![0; 0];
+        cube.translate(Point3d::new(X_TRANS_RATE, Y_TRANS_RATE, Z_TRANS_RATE));
 
-        let p1 = (2.0 + (frame / 30.0), 2.0, 2.0);
-        let p2 = (8.0 + (frame / 30.0), 8.0, 8.0);
+        update_buffer_with_pixels(&mut buffer, cube.render(&m));
 
-        let p1 = convert_3d_to_2d(&m, p1.0, p1.1, p1.2);
-        let p2 = convert_3d_to_2d(&m, p2.0, p2.1, p2.2);
+        x_trans += X_TRANS_RATE;
+        y_trans += Y_TRANS_RATE;
+        z_trans += Z_TRANS_RATE;
 
-        let line = generate_line_between_verticies(p1.0, p1.1, p2.0, p2.1);
-
-        update_buffer_with_pixels(&mut buffer, line.0, line.1);
-
-        frame += 1.0;
-
-        if frame > 150.0 {
-            frame = 0.0;
+        if x_trans > MAX_TRANS {
+            cube.translate(Point3d::new(-x_trans, 0.0, 0.0));
+            x_trans = 0.0;
+        }
+        if y_trans > MAX_TRANS {
+            cube.translate(Point3d::new(0.0, -y_trans, 0.0));
+            y_trans = 0.0;
+        }
+        if z_trans > MAX_TRANS {
+            cube.translate(Point3d::new(0.0, 0.0, -z_trans));
+            z_trans = 0.0;
         }
 
         //Required to close, and update frame;
@@ -294,32 +298,185 @@ fn main() -> AnyResult<()> {
             break;
         }
         window.update_with_buffer(&buffer, WINDOW_WIDTH, WINDOW_HEIGHT)?;
+        gif_buffer.push(
+            buffer
+                .iter()
+                .flat_map(|pixel| pixel.to_be_bytes())
+                .collect(),
+        );
     }
 
+    export_gif(WINDOW_WIDTH, WINDOW_HEIGHT, 30, gif_buffer)?;
+
     Ok(())
 }
 
-fn update_buffer_with_pixels(buf: &mut Vec<u32>, u: Vec<i32>, v: Vec<i32>) {
-    u.into_iter().zip(v).for_each(|(x, y)| {
-        let index = (y as usize) * WINDOW_WIDTH + (x as usize);
+///A Cube defined by 8 3d points.
+#[derive(Debug)]
+struct Cube {
+    pub trb: Point3d,
+    pub trf: Point3d,
+    pub tlb: Point3d,
+    pub tlf: Point3d,
+
+    pub blf: Point3d,
+    pub blb: Point3d,
+    pub brf: Point3d,
+    pub brb: Point3d,
+}
+
+impl Cube {
+    pub fn new(
+        trb: Point3d,
+        trf: Point3d,
+        tlb: Point3d,
+        tlf: Point3d,
+        blf: Point3d,
+        blb: Point3d,
+        brf: Point3d,
+        brb: Point3d,
+    ) -> Self {
+        Cube {
+            trb,
+            trf,
+            tlb,
+            tlf,
+            blf,
+            blb,
+            brf,
+            brb,
+        }
+    }
+
+    pub fn render(&self, m: &ng::Matrix3x4<f64>) -> Vec<Point2d> {
+        let mut points = Vec::new();
+
+        let trb = self.trb.project(m);
+        let trf = self.trf.project(m);
+        let tlb = self.tlb.project(m);
+        let tlf = self.tlf.project(m);
+
+        let blf = self.blf.project(m);
+        let blb = self.blb.project(m);
+        let brf = self.brf.project(m);
+        let brb = self.brb.project(m);
+
+        points.append(&mut generate_line_between_verticies(&trf, &trb)); // Line 1
+        points.append(&mut generate_line_between_verticies(&trb, &tlb)); // Line 2
+        points.append(&mut generate_line_between_verticies(&tlb, &tlf)); // Line 3
+        points.append(&mut generate_line_between_verticies(&tlf, &trf)); // Line 4
+        points.append(&mut generate_line_between_verticies(&blf, &brf)); // Line 5
+        points.append(&mut generate_line_between_verticies(&brf, &brb)); // Line 6
+        points.append(&mut generate_line_between_verticies(&brb, &blb)); // Line 7
+        points.append(&mut generate_line_between_verticies(&blb, &blf)); // Line 8
+        points.append(&mut generate_line_between_verticies(&blf, &tlf)); // Line 9
+        points.append(&mut generate_line_between_verticies(&blb, &tlb)); // Line 10
+        points.append(&mut generate_line_between_verticies(&brb, &trb)); // Line 11
+        points.append(&mut generate_line_between_verticies(&brf, &trf)); // Line 12
+
+        points
+    }
+
+    ///translates the cube by Point amount
+    pub fn translate(&mut self, translate_by: Point3d) {
+        self.trb.translate(&translate_by);
+        self.trf.translate(&translate_by);
+        self.tlb.translate(&translate_by);
+        self.tlf.translate(&translate_by);
+
+        self.blf.translate(&translate_by);
+        self.blb.translate(&translate_by);
+        self.brf.translate(&translate_by);
+        self.brb.translate(&translate_by);
+    }
+}
+
+#[derive(Debug)]
+struct Point3d {
+    pub x: f64,
+    pub y: f64,
+    pub z: f64,
+}
+
+impl Point3d {
+    pub fn new(x: f64, y: f64, z: f64) -> Self {
+        Point3d { x, y, z }
+    }
+
+    pub fn project(&self, m: &ng::Matrix3x4<f64>) -> Point2d {
+        convert_3d_to_2d(m, self)
+    }
+
+    pub fn translate(&mut self, translate_by: &Point3d) {
+        self.x += translate_by.x;
+        self.y += translate_by.y;
+        self.z += translate_by.z;
+    }
+}
+
+#[derive(Debug)]
+struct Point2d {
+    pub x: i32,
+    pub y: i32,
+}
+
+impl Point2d {
+    pub fn new(x: i32, y: i32) -> Self {
+        Self { x, y }
+    }
+}
+
+fn update_buffer_with_pixels(buf: &mut Vec<u32>, points: Vec<Point2d>) {
+    points.into_iter().for_each(|point| {
+        let index = (point.y as usize) * WINDOW_WIDTH + (point.x as usize);
         buf[index] = u32::MAX
     });
 }
 
-fn generate_line_between_verticies(u_1: i32, v_1: i32, u_2: i32, v_2: i32) -> (Vec<i32>, Vec<i32>) {
-    let mut u = vec![0; 0];
-    let mut v = vec![0; 0];
+fn generate_line_between_verticies(point_1: &Point2d, point_2: &Point2d) -> Vec<Point2d> {
+    let mut points = Vec::new();
 
-    let u_diff = u_2 - u_1;
-    let v_diff = v_2 - v_1;
+    let x_diff = point_2.x - point_1.x;
+    let y_diff = point_2.y - point_1.y;
 
-    let u_change = u_diff / 100;
-    let v_change = v_diff / 100;
+    let x_change = x_diff as f64 / 100.0;
+    let y_change = y_diff as f64 / 100.0;
 
     for i in 0..100 {
-        u.push(u_1 + (i * u_change));
-        v.push(v_1 + (i * v_change));
+        points.push(Point2d::new(
+            point_1.x + (i as f64 * x_change) as i32,
+            point_1.y + (i as f64 * y_change) as i32,
+        ));
     }
 
-    (u, v)
+    points
+}
+
+use image::codecs::gif::{GifEncoder, Repeat};
+use image::{Delay, Frame, RgbaImage};
+
+fn export_gif(
+    width: usize,
+    height: usize,
+    fps: u32,
+    frames: Vec<Vec<u8>>, // Each inner Vec is width * height * 4 bytes (RGBA)
+) -> AnyResult<()> {
+    let file = File::create("animation.gif")?;
+    let mut encoder = GifEncoder::new(file);
+
+    // Loop forever
+    encoder.set_repeat(Repeat::Infinite)?;
+
+    for raw_buffer in frames {
+        // Construct the image from your raw pixel slice
+        let img = RgbaImage::from_raw(width as u32, height as u32, raw_buffer).unwrap();
+
+        // Calculate frame timing (e.g., 1000 / 30 = 33.3ms)
+        let delay = Delay::from_numer_denom_ms(1000, fps);
+        let frame = Frame::from_parts(img, 0, 0, delay);
+
+        encoder.encode_frame(frame)?;
+    }
+
+    Ok(())
 }