diff --git a/leenkx/Shaders/water_pass/water_pass.frag.glsl b/leenkx/Shaders/water_pass/water_pass.frag.glsl
index 2c21f25c..efe72a37 100644
--- a/leenkx/Shaders/water_pass/water_pass.frag.glsl
+++ b/leenkx/Shaders/water_pass/water_pass.frag.glsl
@@ -151,6 +151,7 @@ void main() {
 	}
 
 	// Displace surface
+	float geomZ = p.z; // undisplaced depth for foam/fog tests
 	p.z += (sin(p.x * 10.0 / waterDisplace + speed) * cos(p.y * 10.0 / waterDisplace + speed)
 	      + sin(p.x * 20.0 / waterDisplace + speed * 1.3) * cos(p.y * 20.0 / waterDisplace + speed * 1.3) * 0.5)
 	      / 50.0 * waterDisplace;
@@ -229,13 +230,13 @@ void main() {
 	float specAmount = pow(max(dot(n2, h), 0.0), 200.0) * (200.0 + 8.0) / (PI * 8.0);
 	fragColor.rgb += specAmount * (isSky ? 0.3 : 1.0) * horizonFactor;
 	// Depth fog - blend toward waterColor with depth, faded at horizon
-	float depthFog = clamp(-(p.z - waterLevel) * waterDensity, 0.0, 0.9);
+	float depthFog = clamp(-(geomZ - waterLevel) * waterDensity, 0.0, 0.9);
 	fragColor.rgb = mix(fragColor.rgb, waterColor, depthFog * horizonFactor);
 	// Alpha fades smoothly at horizon instead of hard cut
-	fragColor.a = isSky ? horizonFactor : clamp(abs(p.z - waterLevel) * 5.0, 0.0, 1.0);
+	fragColor.a = isSky ? horizonFactor : clamp(abs(geomZ - waterLevel) * 5.0, 0.0, 1.0);
 
 	// Foam - based on actual geometry depth below water surface
-	float fd = isSky ? 1.0 : abs(p.z - waterLevel);
+	float fd = isSky ? 1.0 : abs(geomZ - waterLevel);
 	if (fd < 0.1) {
 		// Based on foam by Owen Deery
 		// http://fire-face.com/personal/water