diff --git a/src/ray.rs b/src/ray.rs
new file mode 100644
index 0000000..2b4eecf
--- /dev/null
+++ b/src/ray.rs
@@ -0,0 +1,15 @@
+use nalgebra::Vector4;
+
+#[derive(Copy, Clone)]
+pub struct Ray {
+    a: Vector4<f32>,
+    b: Vector4<f32>,
+}
+impl Ray {
+    fn new(_a: Vector4<f32>, _b: Vector4<f32>) -> Ray {
+        Ray { a: _a, b: _b }
+    }
+    fn point_at_paremeter(&self, t: f32) -> Vector4<f32> {
+        self.a + t * self.b
+    }
+}
diff --git a/src/shader.wsgl b/src/shader.wsgl
new file mode 100644
index 0000000..f84ccfe
--- /dev/null
+++ b/src/shader.wsgl
@@ -0,0 +1,11 @@
+@vertex
+fn vs_main(@builtin(vertex_index) in_vertex_index: u32) -> @builtin(position) vec4<f32> {
+    let x = f32(i32(in_vertex_index) - 1);
+    let y = f32(i32(in_vertex_index & 1u) * 2 - 1);
+    return vec4<f32>(x, y, 0.0, 1.0);
+}
+
+@fragment
+fn fs_main() -> @location(0) vec4<f32> {
+    return vec4<f32>(1.0, 0.0, 0.0, 1.0);
+}