fix rendering order

game/Cargo.lock

@@ -39,7 +39,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1d73fc820b0b6b9bd0557de7b799ec9da1ca4f35fcd1cb42f7ceb85e640d1477"
 
 [[package]]
-name = "unnamed-game-engine"
+name = "skate-slope"
 version = "0.1.0"
 dependencies = [
  "sdl3",

game/Cargo.toml

@@ -1,5 +1,5 @@
 [package]
-name = "unnamed-game-engine"
+name = "skate-slope"
 version = "0.1.0"
 edition = "2021"
 

game/src/engine/scene.rs

@@ -18,35 +18,41 @@ impl Scene {
     }
 
     pub fn render<R: Renderer>(&mut self, r: &mut R, camera: V3) {
-        self.objects.sort_by(|a, b| {
-            let a = a
-                .triangle
-                .points()
-                .map(|p| p.distance(camera))
-                .into_iter()
-                .max_by(|a, b| a.total_cmp(b))
-                .unwrap();
-            let b = b
-                .triangle
-                .points()
-                .map(|p| p.distance(camera))
-                .into_iter()
-                .max_by(|a, b| a.total_cmp(b))
-                .unwrap();
-            b.total_cmp(&a)
-        });
-
-        let drawn_triangles = self
+        let mut indices_with_scores = self
             .objects
             .iter()
-            .filter(|v| {
-                v.triangle.0 .2 >= -1.0 && v.triangle.1 .2 >= -1.0 && v.triangle.2 .2 >= -1.0
+            .enumerate()
+            .map(|(i, object)| {
+                let mut point_scores = object.triangle.points().map(|p| p.distance(camera));
+                point_scores.sort_by(|a, b| a.total_cmp(b));
+
+                (i, point_scores[0])
             })
-            .map(|v| (v.triangle.project_2d(), v.outline_color, v.fill_color));
-        for (triangle, outline_color, fill_color) in drawn_triangles {
-            r.draw_triangle(triangle.clone(), fill_color);
-            r.draw_line(triangle.0, triangle.1, outline_color);
-            r.draw_line(triangle.0, triangle.2, outline_color);
+            .rev()
+            .collect::<Vec<_>>();
+
+        indices_with_scores.sort_by(|a, b| b.1.total_cmp(&a.1));
+
+        for (i, _) in indices_with_scores {
+            let object = &self.objects[i];
+
+            // check if behind camera
+            if !(object.triangle.0 .2 >= -1.0
+                && object.triangle.1 .2 >= -1.0
+                && object.triangle.2 .2 >= -1.0)
+            {
+                continue;
+            }
+
+            if object.triangle.normal().dot(object.triangle.0 - camera) >= 0.0 {
+                continue;
+            }
+
+            let triangle = object.triangle.project_2d();
+
+            r.draw_triangle(triangle.clone(), object.fill_color);
+            r.draw_line(triangle.0, triangle.1, object.outline_color);
+            r.draw_line(triangle.0, triangle.2, object.outline_color);
         }
     }
 

game/src/main.rs

@@ -120,7 +120,7 @@ struct ShapeGroupShape {
 }
 
 struct ShapeGroup {
-    shapes: Vec<ShapeGroupShape>,
+    pub shapes: Vec<ShapeGroupShape>,
 }
 
 impl ShapeGroup {
@@ -188,6 +188,7 @@ impl Object {
     fn render(&self, scene: &mut Scene) {
         match self.kind {
             ObjectKind::SkateBoard { pos, rot, .. } => {
+                let camera_pos = V3(0.0, 0.0, -1.0);
                 let board = ShapeGroup::new(vec![
                     ShapeGroupShape {
                         shape: Shape::new_cube(V3(0.2, 0.01, 0.05)),