From b637590308ff372a6bbbdb5c5a4272050ff93842 Mon Sep 17 00:00:00 2001
From: numzero <numzer0@yandex.ru>
Date: Sat, 29 Mar 2025 00:00:04 +0300
Subject: [PATCH] Ditch envmap in favor of clear blue sky
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It’s photometric now!
---
 src/trace.wgsl | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/trace.wgsl b/src/trace.wgsl
index 727b320..122cffc 100644
--- a/src/trace.wgsl
+++ b/src/trace.wgsl
@@ -104,8 +104,14 @@ fn trace_fragment(in: Varying) -> vec3f {
 			}
 		}
 		if (sphere == -1) {
-			let env = textureSampleLevel(env_texture, env_sampler, ray, 0.0);
-			result += 3.0 * color * env.xyz;
+			let theta = dot(ray, normalize(vec3(0., 0., 1.)));
+			var env: vec3f; // in kilonits
+			if (theta > 0.999988647254458) {
+				env = vec3(1.6e6, 1.5e6, 1.0e6);
+			} else {
+				env = mix(vec3(0.5, 1.0, 2.0), vec3(2.0, 3.0, 4.0), 0.5 * theta + 0.5);
+			}
+			result += color * env.xyz;
 			break;
 		}
 		let s = spheres[sphere];