Function zero

terrain.js:181–188

(mesh)

}

function zero(mesh) {
    var z = [];
    for (var i = 0; i < mesh.vxs.length; i++) {
        z[i] = 0;
    }
    z.mesh = mesh;
    return z;
}

function slope(mesh, direction) {
    return mesh.map(function (x) {