initial commit

src/geometry/polyhedra/cube.rs

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+use std::collections::HashMap;
+
+use kiss3d::nalgebra::{Point3, Vector3};
+
+use crate::geometry::{
+    atom::{Polyhedron, PrimitiveAtom},
+    face::{Face, FaceType},
+};
+
+pub fn create_cube_atom() -> PrimitiveAtom {
+    let cube = create_cube_polyhedron();
+
+    // Create 6 solid faces for the cube
+    let mut face_types = HashMap::new();
+    let mut face_ids = vec![];
+
+    for face in &cube.faces {
+        face_types.insert(face.clone().id(), FaceType::Solid);
+        face_ids.push(face.clone().id());
+    }
+
+    PrimitiveAtom {
+        geometry: cube,
+        faces: face_ids,
+        face_types,
+    }
+}
+
+pub fn create_cube_polyhedron() -> Polyhedron {
+    // Unit cube vertices: 8 corners
+    let vertices = vec![
+        Point3::new(0.0f32, 0.0, 0.0), // 0: origin
+        Point3::new(1.0f32, 0.0, 0.0), // 1
+        Point3::new(1.0f32, 1.0, 0.0), // 2
+        Point3::new(0.0f32, 1.0, 0.0), // 3
+        Point3::new(0.0f32, 0.0, 1.0), // 4
+        Point3::new(1.0f32, 0.0, 1.0), // 5
+        Point3::new(1.0f32, 1.0, 1.0), // 6
+        Point3::new(0.0f32, 1.0, 1.0), // 7
+    ];
+
+    // 6 faces of the cube, each defined by 4 vertex indices
+    let faces = vec![
+        // Bottom face (z=0), normal pointing down
+        Face::from_type(
+            FaceType::Solid,
+            vec![0, 1, 2, 3],
+            Vector3::new(0.0f32, 0.0, -1.0),
+        ),
+        // Top face (z=1), normal pointing up
+        Face::from_type(
+            FaceType::Solid,
+            vec![4, 7, 6, 5],
+            Vector3::new(0.0f32, 0.0, 1.0),
+        ),
+        // Front face (y=0), normal pointing forward
+        Face::from_type(
+            FaceType::Solid,
+            vec![0, 4, 5, 1],
+            Vector3::new(0.0f32, -1.0, 0.0),
+        ),
+        // Back face (y=1), normal pointing back
+        Face::from_type(
+            FaceType::Solid,
+            vec![3, 2, 6, 7],
+            Vector3::new(0.0f32, 1.0, 0.0),
+        ),
+        // Left face (x=0), normal pointing left
+        Face::from_type(
+            FaceType::Solid,
+            vec![0, 3, 7, 4],
+            Vector3::new(-1.0f32, 0.0, 0.0),
+        ),
+        // Right face (x=1), normal pointing right
+        Face::from_type(
+            FaceType::Solid,
+            vec![1, 5, 6, 2],
+            Vector3::new(1.0f32, 0.0, 0.0),
+        ),
+    ];
+
+    Polyhedron { vertices, faces }
+}