varying vec2 vUv;
varying float vDisplacement;

uniform sampler2D tDepth;
uniform float uDepthScale;

void main() {
    vUv = uv;
    
    // Read depth from texture
    float depth = texture2D(tDepth, uv).r;
    vDisplacement = depth;
    
    // Displace z position based on depth
    vec3 newPosition = position;
    newPosition.z += depth * uDepthScale;
    
    gl_Position = projectionMatrix * modelViewMatrix * vec4(newPosition, 1.0);
}