From 12b8fee0b0f4bd70d5b74585a2049bd9932f671b Mon Sep 17 00:00:00 2001
From: Eric Smith <5d@fifthdread.com>
Date: Wed, 20 May 2026 21:41:37 -0400
Subject: [PATCH] fix: sample noise at distorted uv for visible deformation
 effects

---
 shaders/vial_fill.gdshader | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/shaders/vial_fill.gdshader b/shaders/vial_fill.gdshader
index 395692d..7f5094c 100644
--- a/shaders/vial_fill.gdshader
+++ b/shaders/vial_fill.gdshader
@@ -112,11 +112,11 @@ void fragment() {
 	// swirl
 	uv = get_swirl_uv(uv, swirl_strength);
 
-	// sample the ColorRect texture (water image if assigned, else 1x1 white)
-	vec4 tex = texture(TEXTURE, uv);
-
-	// hue-shift the base liquid colour, modulated by the texture
-	vec3 base_rgb = tex.rgb * liquid_color.rgb;
+	// Sample the noise at the distorted UV for visible liquid variation.
+	// (ColorRect has no texture, so TEXTURE is always white — this makes
+	//  wave/ripple/swirl deformation visible by sampling noise instead.)
+	float detail = texture(noise_tex, (uv * noise_module_size / 100.0 * noise_scale + t * 0.03) * 0.5).r;
+	vec3 base_rgb = liquid_color.rgb * (0.85 + 0.15 * detail);
 	vec3 hsv = rgb2hsv(base_rgb);
 	hsv.x = fract(hsv.x + t * 0.1 * hue_shift_speed);
 	hsv.y = clamp(hsv.y + 0.2 * noise_val, 0.0, 1.0);