precision highp float;
attribute vec3 land;
uniform float time; //used for noise
uniform float world_x;
uniform float world_y;
uniform mat4 MV;
uniform mat4 P;
varying vec2 worldxy;
varying mat4 pre;
void main() {
	worldxy = vec2(world_x, world_y);
	pre = P * MV;
	gl_Position = P * MV * vec4(land.x - world_x, land.y - world_y, 0., 1.0);
}