diff --git a/Cargo.toml b/Cargo.toml
index 9a0877d..081fb35 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -9,6 +9,7 @@ glium = "*"
 image = "*"
 byteorder = "*"
 clap = "*"
+nalgebra = "*"
 verbose-log = { git = "https://gitea.tforgione.fr/dash-3d/verbose-log" }
 
 [[bin]]
diff --git a/src/camera.rs b/src/camera.rs
index e620354..bca39c0 100644
--- a/src/camera.rs
+++ b/src/camera.rs
@@ -1,37 +1,24 @@
 //! This module contains everything to deal with cameras.
 
+use nalgebra::Matrix4;
+
 use math::vector::Vector3;
 use math::frustum::Frustum;
 
-/// Multiplies two matrices 4x4
-fn multiply_matrices(a: [[f32; 4]; 4], b: [[f32; 4]; 4]) -> [[f32; 4]; 4] {
-    let mut res = [[0.0; 4]; 4];
-
-    for i in 0..4 {
-        for j in 0..4 {
-            for k in 0..4 {
-                res[i][j] += a[i][k] + b[k][j];
-            }
-        }
-    }
-
-    res
-}
-
 /// The trait that a render camera should implement.
 ///
 /// It allows the renderer to use it.
 pub trait RenderCamera {
 
     /// Returns the view matrix of the camera.
-    fn get_view_matrix(&self) -> [[f32; 4]; 4];
+    fn get_view_matrix(&self) -> Matrix4<f32>;
 
     /// Returns the perspective matrix of the camera.
-    fn get_perspective_matrix(&self) -> [[f32; 4]; 4];
+    fn get_perspective_matrix(&self) -> Matrix4<f32>;
 
     /// Returns the product of the perspective matrix and the view matrix.
-    fn get_model_view_matrix(&self) -> [[f32; 4]; 4] {
-        multiply_matrices(self.get_perspective_matrix(), self.get_view_matrix())
+    fn get_model_view_matrix(&self) -> Matrix4<f32> {
+        self.get_perspective_matrix() * self.get_view_matrix().try_inverse().unwrap()
     }
 
     /// Returns the frustum of the camera.
@@ -42,7 +29,7 @@ pub trait RenderCamera {
 }
 
 /// Creates a look at matrix from the center, the target pointed by the camera and the up vector.
-pub fn look_at_matrix(position: [f32; 3], target: [f32; 3], up: [f32; 3]) -> [[f32; 4]; 4] {
+pub fn look_at_matrix(position: [f32; 3], target: [f32; 3], up: [f32; 3]) -> Matrix4<f32> {
     let f = {
         let f = [
             target[0] - position[0],
@@ -77,12 +64,12 @@ pub fn look_at_matrix(position: [f32; 3], target: [f32; 3], up: [f32; 3]) -> [[f
         [-s_norm[1], u[1], f[1], 0.0],
         [-s_norm[2], u[2], f[2], 0.0],
         [-p[0],      p[1], p[2], 1.0],
-    ]
+    ].into()
 
 }
 
 /// Creates a perspective matrix of a camera.
-pub fn perspective_matrix(aspect_ratio: f32, z_near: f32, z_far: f32) -> [[f32; 4]; 4] {
+pub fn perspective_matrix(aspect_ratio: f32, z_near: f32, z_far: f32) -> Matrix4<f32> {
     let fov = 3.141592 / 3.0;
 
     use num::Float;
@@ -93,7 +80,7 @@ pub fn perspective_matrix(aspect_ratio: f32, z_near: f32, z_far: f32) -> [[f32;
         [         0.0         ,     f ,              0.0              ,   0.0],
         [         0.0         ,    0.0,  (z_far+z_near)/(z_far-z_near)    ,   1.0],
         [         0.0         ,    0.0, -(2.0*z_far*z_near)/(z_far-z_near),   0.0],
-    ]
+    ].into()
 }
 
 /// A simple camera with its position, target and up vector.
@@ -139,11 +126,11 @@ impl Camera {
 }
 
 impl RenderCamera for Camera {
-    fn get_view_matrix(&self) -> [[f32; 4]; 4] {
+    fn get_view_matrix(&self) -> Matrix4<f32> {
         look_at_matrix(self.position.into(), self.target.into(), self.up.into())
     }
 
-    fn get_perspective_matrix(&self) -> [[f32; 4]; 4] {
+    fn get_perspective_matrix(&self) -> Matrix4<f32> {
         perspective_matrix(self.aspect_ratio, self.z_near, self.z_far)
     }
 }
diff --git a/src/lib.rs b/src/lib.rs
index f682777..bf9b1af 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -4,6 +4,7 @@
 
 extern crate num;
 extern crate image;
+extern crate nalgebra;
 
 #[macro_use] extern crate verbose_log;
 #[macro_use] extern crate glium;
diff --git a/src/math/frustum.rs b/src/math/frustum.rs
index baafc42..be2a872 100644
--- a/src/math/frustum.rs
+++ b/src/math/frustum.rs
@@ -3,6 +3,8 @@
 //! The frustum is the field of view of a camera. It allows you to make computation to know what is
 //! visible or not in an efficient manner, though it doesn't take occlusions into account.
 
+use nalgebra::Matrix4;
+
 use math::vector::Vector3;
 use math::plane::Plane;
 use math::bounding_box::BoundingBox3;
@@ -18,12 +20,12 @@ impl Frustum {
     /// Creates a frustum from the matrix of a camera.
     ///
     /// This is *ahem...* slightly inspired from THREE.js Frustum
-    pub fn from_matrix(m: &[[f32; 4]; 4]) -> Frustum {
+    pub fn from_matrix(m: &Matrix4<f32>) -> Frustum {
 
-        let m0  = m[0][0]; let m1  = m[0][1]; let m2  = m[0][2]; let m3  = m[0][3];
-        let m4  = m[1][0]; let m5  = m[1][1]; let m6  = m[1][2]; let m7  = m[1][3];
-        let m8  = m[2][0]; let m9  = m[2][1]; let m10 = m[2][2]; let m11 = m[2][3];
-        let m12 = m[3][0]; let m13 = m[3][1]; let m14 = m[3][2]; let m15 = m[3][3];
+        let m0  = m[(0, 0)]; let m1  = m[(0, 1)]; let m2  = m[(0, 2)]; let m3  = m[(0, 3)];
+        let m4  = m[(1, 0)]; let m5  = m[(1, 1)]; let m6  = m[(1, 2)]; let m7  = m[(1, 3)];
+        let m8  = m[(2, 0)]; let m9  = m[(2, 1)]; let m10 = m[(2, 2)]; let m11 = m[(2, 3)];
+        let m12 = m[(3, 0)]; let m13 = m[(3, 1)]; let m14 = m[(3, 2)]; let m15 = m[(3, 3)];
 
         Frustum {
             planes: [
diff --git a/src/model/mod.rs b/src/model/mod.rs
index 99a184e..2f279d7 100644
--- a/src/model/mod.rs
+++ b/src/model/mod.rs
@@ -285,6 +285,8 @@ impl Model {
                     new_part.faces.push(face.clone());
                     new_faces.push(face);
                 }
+
+                new_part.needs_update = true;
             }
 
             for face in new_faces {
diff --git a/src/renderer.rs b/src/renderer.rs
index c02128c..548f937 100644
--- a/src/renderer.rs
+++ b/src/renderer.rs
@@ -156,9 +156,9 @@ impl Renderer {
                         &self.program,
                         &uniform!(
                             tex: texture,
-                            perspective: perspective,
-                            view: view,
-                            ),
+                            perspective: Into::<[[f32; 4]; 4]>::into(perspective),
+                            view: Into::<[[f32; 4]; 4]>::into(view),
+                        ),
                             &params,
                         ).unwrap();
                 }