From 94b14ec5a24f587c97b11d6c56b9116a58a7385a Mon Sep 17 00:00:00 2001
From: Julian T <julian@jtle.dk>
Date: Sun, 7 Mar 2021 18:25:35 +0100
Subject: Add light materials

---
 src/material/sky_light.rs | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)
 create mode 100644 src/material/sky_light.rs

(limited to 'src/material/sky_light.rs')

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)
+    }
+}
-- 
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