#version 330 core
layout(location = 0) in vec3 aPos;
layout(location = 1) in vec2 aUv;
layout(location = 2) in float aShade;

out vec2 vUv;
out float vShade;
out float vWorldY;

uniform mat4 model;
uniform mat4 view;
uniform mat4 projection;

void main()
{
    vUv = aUv;
    vShade = aShade;
    // World-space position uses row-vector convention (matches gl_Position below).
    vec4 worldPos = vec4(aPos, 1.0) * model;
    vWorldY = worldPos.y;
    gl_Position = worldPos * view * projection;
}