#version 330 core
in vec2 vUV;
in vec3 vWorldPos;
out vec4 FragColor;

uniform sampler2D uHeightTex;
uniform float uMinV;
uniform float uMaxV;
uniform float uHeightScale;
uniform vec2 uTexelSize;
uniform vec2 uPlaneSize;
uniform vec3 uCameraPos;
uniform vec3 uLightDir;
uniform vec3 uColorZero;
uniform vec3 uColorLow;
uniform vec3 uColorMid;
uniform vec3 uColorHigh;

float saturate(float x) {
    return clamp(x, 0.0, 1.0);
}

float value01(float v) {
    return saturate((v - uMinV) / max(uMaxV - uMinV, 1e-6));
}

float maxNeighborValue(vec2 uv)