创建一个熔岩瀑布效果着色器，包含熔岩流动、热浪、岩浆气泡、水火混合和蒸汽效果，支持熔岩强度和水火混合调节。

float lavaFlow(vec2 uv, float time) {
    float flow = 0.0;
    
    // 创建熔岩流动
    for (int i = 0; i < 3; i++) {
        float layer = float(i) * 0.3;
        float speed = 1.0 + layer * 0.8;
        
        flow += sin(uv.y * 15.0 - time * speed + layer) * 0.2;
    }
    
    return flow * 0.5 + 0.5;
}

float thermalWave(vec2 uv, float time) {
    float wave = 0.0;
    
    // 创建热浪波动
    for (int i = 0; i < 2; i++) {
        float frequency = 6.0 + float(i) * 3.0;
        wave += sin(uv.x * frequency + time * 2.0) * 
               cos(uv.y * frequency + time * 1.5) * 0.15;
    }
    
    return wave * thermalFlow;
}

float magmaBubbles(vec2 uv, float time) {
    float bubbles = 0.0;
    
    // 创建岩浆气泡
    for (int i = 0; i < 5; i++) {
        float seed = float(i) * 45.678;
        vec2 bubblePos = vec2(
            fract(sin(seed * 78.233) * 43758.5453),
            fract(sin(seed * 12.9898) * 43758.5453)
        );
        
        float dist = distance(uv, bubblePos);
        float size = 0.05 + fract(seed * 34.567) * 0.1;
        
        bubbles += smoothstep(size, 0.0, dist) * sin(time * 3.0 + seed) * 0.2;
    }
    
    return bubbles;
}

float waterLavaMix(vec2 uv, float time, float mixRatio) {
    float mixEffect = 0.0;
    
    // 创建水火混合区域
    for (int i = 0; i < 2; i++) {
        float phase = float(i) * 1.57;
        mixEffect += sin(uv.x * 12.0 + time * 1.5 + phase) * 
                    cos(uv.y * 12.0 + time * 1.2 + phase) * 0.1;
    }
    
    return mixEffect * mixRatio;
}

uniforms: {
    time: { value: 0 },
    resolution: { value: new THREE.Vector2(_width, _height) },
    lavaIntensity: { value: 2.0 },
    waterMix: { value: 0.5 },
    thermalFlow: { value: 0.8 },
    lavaColor: { value: new THREE.Color(0xff5500) }
}