uniform mat4 g_WorldViewProjectionMatrix;
uniform mat4 g_WorldMatrix;

in vec3 inPosition;

out float vWorldY;

void main() {
    vec4 worldPos = g_WorldMatrix * vec4(inPosition, 1.0);
    vWorldY = worldPos.y;
    gl_Position = g_WorldViewProjectionMatrix * vec4(inPosition, 1.0);
}