Add light materials

1 files changed, 19 insertions, 0 deletions

diff --git a/src/material/sky_light.rs b/src/material/sky_light.rs
new file mode 100644
index 0000000..e499b6e
--- /dev/null
+++ b/src/material/sky_light.rs
@@ -0,0 +1,19 @@
+use super::Material;
+use crate::core::{Ray, Spectrum};
+
+pub struct SkyLight {
+}
+
+impl SkyLight {
+    pub fn new() -> Self {
+        Self {}
+    }
+}
+
+impl Material for SkyLight {
+    fn emitted(&self, ray: &Ray) -> Option<Spectrum> {
+        let t = (ray.direction.norm().y + 1.0) * 0.5;
+
+        Some(Spectrum::new_rgb(1.0, 1.0, 1.0) * (1.0-t) + Spectrum::new_rgb(0.5, 0.7, 1.0) * t)
+    }
+}