From f29f83f635e3c8d784241cdc26e67fe8cda72f08 Mon Sep 17 00:00:00 2001
From: nsfisis <nsfisis@gmail.com>
Date: Sat, 28 Jan 2023 20:37:10 +0900
Subject: 5.5

---
 src/rtw/texture.zig | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'src/rtw/texture.zig')

diff --git a/src/rtw/texture.zig b/src/rtw/texture.zig
index cf2b08b..537ce47 100644
--- a/src/rtw/texture.zig
+++ b/src/rtw/texture.zig
@@ -88,6 +88,7 @@ pub const NoiseTexture = struct {
     fn value(tx: NoiseTexture, u: f64, v: f64, p: Vec3) Color {
         _ = u;
         _ = v;
-        return rgb(1, 1, 1).mul(tx.perlin.noise(p.mul(tx.scale)));
+        const t = tx.perlin.noise(p.mul(tx.scale));
+        return rgb(1, 1, 1).mul((1.0 + t) / 2.0);
     }
 };
-- 
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