From 90a05a86d8cd7b8a6643f248a19395d98accc45e Mon Sep 17 00:00:00 2001
From: Richard Zink <Richard Zink>
Date: Tue, 3 Nov 2026 20:03:32 +0100
Subject: [PATCH] Knight towers in bright limestone with dark blue shadows and
 royal blue wood and fittings (more contrast)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 src/render3d.rs | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/src/render3d.rs b/src/render3d.rs
index 6e1c8f4..47dd282 100644
--- a/src/render3d.rs
+++ b/src/render3d.rs
@@ -1304,6 +1304,20 @@ pub fn tower_height(t: &Tower) -> f32 {
     t.top()
 }
 
+// the colours of the knights' towers from the same model colours: brightness is stretched
+// (strong contrast between masonry and joints), warm parts (wood, bronze) turn royal blue
+fn knight_c(r: u8, g: u8, b: u8, f: f32) -> Color {
+    let l = ((r as f32 + g as f32 + b as f32) / (3.0 * 255.0) * 1.7).min(1.0);
+    let lerp = |a: f32, b: f32| a + (b - a) * l;
+    let warm = r as i32 - b as i32 > 30;
+    let (cr, cg, cb) = if warm {
+        (lerp(20.0, 70.0), lerp(30.0, 110.0), lerp(80.0, 230.0))
+    } else {
+        (lerp(28.0, 238.0), lerp(34.0, 232.0), lerp(72.0, 214.0))
+    };
+    Color::new(cr / 255.0 * f, cg / 255.0 * f, cb / 255.0 * f, 1.0)
+}
+
 fn shade_c(r: u8, g: u8, b: u8, f: f32) -> Color {
     Color::new(r as f32 / 255.0 * f, g as f32 / 255.0 * f, b as f32 / 255.0 * f, 1.0)
 }
@@ -1349,8 +1363,8 @@ fn draw_towers_solid(g: &Game) {
         let c = vec3(x, 0.0, z);
         let h = tower_height(tw);
         let f = 0.75 + tw.flash * 1.5; // brightens briefly when firing
-        // knight towers: pale stone with blue tones
-        let col = |r: u8, g: u8, b: u8| if tw.hero { shade_c(r / 3 + 110, g / 3 + 115, b / 3 + 135, f) } else { shade_c(r, g, b, f) };
+        // knight towers: bright limestone with dark blue shadows, wood and fittings in royal blue
+        let col = |r: u8, g: u8, b: u8| if tw.hero { knight_c(r, g, b, f) } else { shade_c(r, g, b, f) };
         let bx = |p: Vec3, s: Vec3, cl: Color| draw_cube(c + p, s, None, cl);
         match tw.kind {
             TowerKind::Arrow => {