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代码↓

x方向（z方向简单修改就好了）

function x_road(start_Z, len) {;
    // let start_Z = 58;
    // let len = 126;

    let i;
    let j = start_Z + 10;
    while (j-- > start_Z) {;
        i = len;
        while (i-- > -1) {;
            voxels.setVoxel(i, 8 ,j, 'dark_gray');
        };
    };
    i = len;
    while (i-- > -1) {;
        voxels.setVoxel(i, 8 ,start_Z + 5, 'light_gray');
    };
    i = len;
    while (i-- > -1) {;
        voxels.setVoxel(i, 9 ,start_Z, 'green_leaf');
        voxels.setVoxel(i, 9 ,start_Z + 10, 'green_leaf');
    };

};