Medieval Water(中世纪水)
Fully procedural water shader. Requires no external textures – generates natural ripples, normal bumps, and dynamic foam entirely through real-time noise algorithms. Perfect for Low-Poly or Stylized game projects.
纯程序化水面着色器。无需任何外部贴图，完全基于噪声算法实时计算出自然的波纹、法线凹凸以及动态泡沫，非常适合低多边形（Low-Poly）或风格化（Stylized）游戏项目。
Shader code
shader_type spatial;
render_mode blend_mix,
depth_draw_opaque,
cull_back,
diffuse_burley,
specular_schlick_ggx;
// === 水面基础参数 ===
uniform vec3 water_color : source_color = vec3(0.15, 0.32, 0.22); //水体基础颜色
uniform float water_metallic : hint_range(0.0, 1.0) = 0.0; //金属度
uniform float water_roughness : hint_range(0.0, 1.0) = 0.75; //粗糙度
uniform float water_specular : hint_range(0.0, 1.0) = 0.6; //高光强度
// === 波浪参数 ===
uniform float wave_speed : hint_range(0.0, 5.0) = 0.2; // 波浪流动速度
uniform float wave_scale : hint_range(1.0, 50.0) = 12.0; // 波浪缩放密集度
uniform float wave_normal_strength : hint_range(0.0, 5.0) = 1.5; // 波浪法线(凹凸)强度
// === 泡沫参数 ===
uniform float foam_amount : hint_range(0.0, 1.0) = 0.15; // 泡沫数量
uniform vec3 foam_color : source_color = vec3(0.72, 0.68, 0.52); //泡沫的颜色
uniform float foam_animation_speed : hint_range(0.0, 5.0) = 1.5; // 泡沫变形速度
uniform float foam_detail : hint_range(10.0, 200.0) = 100.0; // 泡沫细节精细度
// === 2D 随机伪随机数生成器 ===
float random(vec2 uv) {
return fract(sin(dot(uv, vec2(12.9898, 78.233))) * 43758.5453);
}
// === 2D 柏林噪声基础函数 ===
float noise(vec2 uv) {
vec2 i = floor(uv);
vec2 f = fract(uv);
// 获取四个角的随机值
float a = random(i);
float b = random(i + vec2(1.0, 0.0));
float c = random(i + vec2(0.0, 1.0));
float d = random(i + vec2(1.0, 1.0));
// 平滑插值 (Cubic Hermite Curve)
vec2 u = f * f * (3.0 - 2.0 * f);
return mix(a, b, u.x) +
(c - a) * u.y * (1.0 - u.x) +
(d - b) * u.x * u.y;
}
// === 分形布朗运动 (FBM) - 叠加多层噪声产生细节 ===
float fbm(vec2 uv) {
float value = 0.0;
float amplitude = 0.5;
float frequency = 1.0;
// 叠加 4 层噪声 (Octaves)
for(int i = 0; i < 4; i++) {
value += amplitude * noise(uv * frequency);
frequency *= 2.0;
amplitude *= 0.5;
}
return value;
}
// === 波浪高度计算 ===
float wave_noise(vec2 uv, float time) {
float t = time * wave_speed;
// 生成两个不同方向流动的 UV，模拟水流交错
vec2 uv1 = uv * wave_scale + vec2(t * 0.3, t * 0.2);
vec2 uv2 = uv * wave_scale * 1.3 + vec2(-t * 0.25, t * 0.35);
float noise1 = fbm(uv1);
float noise2 = fbm(uv2);
// 混合两层噪声并将结果映射到 -1.0 到 1.0 之间
return (noise1 + noise2) - 1.0;
}
// === 动态计算水面法线 ===
vec3 calculate_water_normal(vec2 uv, float time) {
float offset = 0.01; // 采样偏移量，影响法线锐度
// 获取当前点及相邻点的波浪高度
float h_c = wave_noise(uv, time);
float h_r = wave_noise(uv + vec2(offset, 0.0), time);
float h_u = wave_noise(uv + vec2(0.0, offset), time);
// 通过高度差计算法线向量 (Godot 3D空间中 Y 轴向上)
vec3 normal;
normal.x = (h_c - h_r) / offset;
normal.z = (h_c - h_u) / offset;
normal.y = 1.0;
return normalize(normal);
}
void fragment() {
// 1. 动态生成法线贴图
vec3 water_normal = calculate_water_normal(UV, TIME);
water_normal *= vec3(wave_normal_strength, 1.0, wave_normal_strength);
NORMAL_MAP = normalize(water_normal);
// 2. 获取当前像素的波浪高度值 (-1 到 1)
float wave = wave_noise(UV, TIME);
// 3. 基础水体颜色
vec3 final_color = water_color;
// 4. 程序化波峰泡沫
// 使用独立的噪声控制泡沫的形态演变
float foam_noise = fbm(UV * foam_detail + TIME * foam_animation_speed);
float foam_anim = smoothstep(0.3, 0.7, foam_noise);
// 提取波峰区域 (当 wave 接近最高点时生成遮罩)
float foam_mask = smoothstep(0.5, 0.8, wave + 1.0) * foam_amount;
// 混合泡沫颜色
float foam = foam_mask * foam_anim;
final_color = mix(final_color, foam_color, foam);
// 5. 波浪光照高光微调 (使波峰略微受光变亮)
float light_wave = wave * 0.15;
final_color += vec3(0.05, 0.06, 0.04) * light_wave;
// 6. 水体深浅颜色过渡 (波浪低谷略微偏暗偏蓝绿)
float murk = wave * 0.05;
final_color = mix(final_color, vec3(0.12, 0.14, 0.10), murk);
// === 最终属性输出 ===
ALBEDO = final_color;
METALLIC = water_metallic;
// 根据波浪起伏微调粗糙度，增加质感变化
ROUGHNESS = water_roughness + (wave - 0.5) * 0.05;
SPECULAR = water_specular;
}