diff --git a/Cargo.lock b/Cargo.lock
index d9ef259..3c0e0fe 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -311,7 +311,7 @@ checksum = "f1bddf1187be692e79c5ffeab891132dfb0f236ed36a43c7ed39f1165ee20191"
 
 [[package]]
 name = "voxelmap"
-version = "0.4.0"
+version = "0.4.2"
 dependencies = [
  "clap",
  "lodepng",
diff --git a/Cargo.toml b/Cargo.toml
index d5d1089..512d987 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "voxelmap"
-version = "0.4.0"
+version = "0.4.2"
 authors = ["raffitz <raf.a.m.c.gon@gmail.com>"]
 edition = "2018"
 description = "Creates voxel maps to build voxelised objects"
diff --git a/src/astree.rs b/src/astree.rs
index f97145d..f5ef4f6 100644
--- a/src/astree.rs
+++ b/src/astree.rs
@@ -2,7 +2,7 @@ use crate::error::Error;
 use std::collections::{HashMap, HashSet};
 use std::io::Write;
 
-#[derive(Debug, PartialEq)]
+#[derive(Debug, PartialEq, Clone)]
 pub enum FunctionType {
     Sin,
     Cos,
@@ -22,7 +22,7 @@ pub enum FunctionType {
     Neg,
 }
 
-#[derive(Debug)]
+#[derive(Debug, Clone)]
 pub struct FunctionData {
     kind: FunctionType,
     arg: Box<Expression>,
@@ -91,7 +91,7 @@ impl FunctionData {
     }
 }
 
-#[derive(Debug)]
+#[derive(Debug, Clone)]
 pub struct OperationData {
     kind: char,
     left: Box<Expression>,
@@ -142,7 +142,7 @@ impl OperationData {
     }
 }
 
-#[derive(Debug)]
+#[derive(Debug, Clone)]
 pub enum Expression {
     Var(char),
     Float(f64),
diff --git a/src/main.rs b/src/main.rs
index 4aa4b21..490bc56 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -11,15 +11,9 @@ mod error;
 mod ngon;
 mod parser;
 
-macro_rules! scale_message {
-    ($n:ident) => {
-        Err(format!("<{}> is not a valid scale value", $n))
-    };
-}
-
-macro_rules! sides_message {
-    ($n:ident) => {
-        Err(format!("<{}> is not a valid number of sides", $n))
+macro_rules! value_message {
+    ($n:ident, $t:expr) => {
+        Err(format!("<{}> is not a valid {}", $n, $t))
     };
 }
 
@@ -59,7 +53,7 @@ fn main() -> Result<(), error::Error> {
                             return Ok(());
                         }
                     }
-                    scale_message!(n)
+                    value_message!(n,"scale value")
                 }),
         )
         .arg(
@@ -128,6 +122,39 @@ fn main() -> Result<(), error::Error> {
         )
         .subcommand(SubCommand::with_name("ngon")
             .about("Make an ngon")
+            .arg(
+                Arg::with_name("angle")
+                .short("a")
+                .long("angle")
+                .help("Angle in radians by which to rotate the ngon")
+                .takes_value(true)
+                .multiple(false)
+                .value_name("RAD")
+                .validator(|n: String| -> Result<(), String> {
+                    if n.parse::<f64>().is_err() {
+                        value_message!(n,"angle in radians")
+                    }else{
+                        Ok(())
+                    }
+                }),
+            )
+            .arg(
+                Arg::with_name("degrees")
+                .short("e")
+                .long("degrees")
+                .help("Angle in degrees by which to rotate the ngon")
+                .conflicts_with("angle")
+                .takes_value(true)
+                .multiple(false)
+                .value_name("DEG")
+                .validator(|n: String| -> Result<(), String> {
+                    if n.parse::<f64>().is_err() {
+                        value_message!(n,"angle in degrees")
+                    }else{
+                        Ok(())
+                    }
+                }),
+            )
             .arg(
                 Arg::with_name("N")
                 .help("The number of sides of the ngon")
@@ -139,7 +166,7 @@ fn main() -> Result<(), error::Error> {
                             return Ok(());
                         }
                     }
-                    sides_message!(n)
+                    value_message!(n,"number of sides")
                 }),
             )
             .arg(
@@ -240,12 +267,33 @@ fn main() -> Result<(), error::Error> {
             debug,
         )?;
     } else if let Some(submatches) = matches.subcommand_matches("ngon") {
+        let mut labels = HashMap::new();
+        let angleident;
+
+        if let Some(value) = submatches.value_of("angle") {
+            let angle_exp = astree::Expression::float(value.parse::<f64>().unwrap());
+            labels.insert(String::from("@clangle"), angle_exp);
+            angleident = Some(String::from("@clangle"));
+        } else if let Some(value) = submatches.value_of("degrees") {
+            let angle_exp = astree::Expression::float(value.parse::<f64>().unwrap().to_radians());
+            labels.insert(String::from("@clangle"), angle_exp);
+            angleident = Some(String::from("@clangle"));
+        } else {
+            angleident = None;
+        }
+
         output_folder = submatches.value_of("OUTPUT_DIR").unwrap_or(output_folder);
-        structure = ngon::generate(
+        structure = ngon::generate::<String, f64>(
             submatches
                 .value_of("N")
                 .map(|n| n.parse::<u8>().unwrap())
                 .unwrap(),
+            None,
+            None,
+            None,
+            angleident,
+            None,
+            Some(labels),
         )?;
     } else {
         println!("{}", matches.usage());
diff --git a/src/ngon.rs b/src/ngon.rs
index 57c5beb..1ed54fb 100644
--- a/src/ngon.rs
+++ b/src/ngon.rs
@@ -3,29 +3,49 @@ use crate::astree::{Boundaries, Boundary, Condition, Expression, FunctionType, J
 use crate::error;
 use std::collections::HashMap;
 
-pub fn generate(n: u8) -> Result<astree::Structure, error::Error> {
+pub fn generate<T: Into<String> + Clone, S: Into<f64> + Copy>(
+    n: u8,
+    prefix_val: Option<T>,
+    x_offset: Option<T>,
+    y_offset: Option<T>,
+    angle_offset: Option<T>,
+    scale: Option<S>,
+    previous_labels: Option<HashMap<String, Expression>>,
+) -> Result<astree::Structure, error::Error> {
+    let prefix = if let Some(val) = prefix_val {
+        val.into()
+    } else {
+        "".to_string()
+    };
+
     let mut junctions = Vec::<Junction>::with_capacity(n as usize);
 
-    let mut labels = HashMap::<String, Expression>::new();
+    let mut labels = previous_labels.unwrap_or_default();
     let mut vars = HashMap::<char, f64>::new();
     vars.insert('s', 1_f64);
     let vars_eval = Some(&vars);
 
     let double_n: u16 = (n as u16) * 2;
 
-    let mut min_x = 1_f64;
+    let mut min_x = f64::MAX;
     let mut min_x_label = String::from("error");
-    let mut max_x = -1_f64;
+    let mut max_x = f64::MIN;
     let mut max_x_label = String::from("error");
 
-    let mut min_y = 1_f64;
+    let mut min_y = f64::MAX;
     let mut min_y_label = String::from("error");
-    let mut max_y = -1_f64;
+    let mut max_y = f64::MIN;
     let mut max_y_label = String::from("error");
 
+    let multiplier = if let Some(new_scale) = scale {
+        Expression::operation('*', Expression::var('s'), Expression::float(new_scale))
+    } else {
+        Expression::var('s')
+    };
+
     for i in 0..n {
-        let angle_label = format!("@angle{}", i);
-        let angle_exp = Expression::operation(
+        let angle_label = format!("@{}angle{}", prefix, i);
+        let angle_inner = Expression::operation(
             '/',
             Expression::operation(
                 '*',
@@ -34,19 +54,32 @@ pub fn generate(n: u8) -> Result<astree::Structure, error::Error> {
             ),
             Expression::float(n),
         );
+        let angle_offset_clone = angle_offset.clone();
+        let angle_exp = if let Some(ident) = angle_offset_clone {
+            Expression::operation('+', Expression::ident(ident.into()), angle_inner)
+        } else {
+            angle_inner
+        };
+
         labels.insert(angle_label.to_string(), angle_exp);
 
         let idents = Some(&labels);
 
-        let x_label = format!("@x{}", i);
-        let x_exp = Expression::operation(
+        let x_label = format!("@{}x{}", prefix, i);
+        let x_base = Expression::operation(
             '*',
-            Expression::var('s'),
+            multiplier.clone(),
             Expression::function(
                 FunctionType::Cos,
                 Expression::ident(angle_label.to_string()),
             ),
         );
+        let x_offset_clone = x_offset.clone();
+        let x_exp = if let Some(ident) = x_offset_clone {
+            Expression::operation('+', x_base, Expression::ident(ident.into()))
+        } else {
+            x_base
+        };
         let x_val = x_exp.eval(&idents, &vars_eval)?;
         labels.insert(x_label.to_string(), x_exp);
 
@@ -62,15 +95,21 @@ pub fn generate(n: u8) -> Result<astree::Structure, error::Error> {
 
         let idents = Some(&labels);
 
-        let y_label = format!("@y{}", i);
-        let y_exp = Expression::operation(
+        let y_label = format!("@{}y{}", prefix, i);
+        let y_base = Expression::operation(
             '*',
-            Expression::var('s'),
+            multiplier.clone(),
             Expression::function(
                 FunctionType::Sin,
                 Expression::ident(angle_label.to_string()),
             ),
         );
+        let y_offset_clone = y_offset.clone();
+        let y_exp = if let Some(ident) = y_offset_clone {
+            Expression::operation('+', y_base, Expression::ident(ident.into()))
+        } else {
+            y_base
+        };
         let y_val = y_exp.eval(&idents, &vars_eval)?;
         labels.insert(y_label.to_string(), y_exp);
 
@@ -86,8 +125,8 @@ pub fn generate(n: u8) -> Result<astree::Structure, error::Error> {
 
         let normal_index: u16 = (i as u16) * 2 + 1;
 
-        let normal_angle_label = format!("@nangle{}", i);
-        let normal_angle_exp = Expression::operation(
+        let normal_angle_label = format!("@{}nangle{}", prefix, i);
+        let normal_angle_base = Expression::operation(
             '/',
             Expression::operation(
                 '*',
@@ -96,16 +135,22 @@ pub fn generate(n: u8) -> Result<astree::Structure, error::Error> {
             ),
             Expression::float(double_n),
         );
+        let angle_offset_clone = angle_offset.clone();
+        let normal_angle_exp = if let Some(ident) = angle_offset_clone {
+            Expression::operation('+', normal_angle_base, Expression::ident(ident.into()))
+        } else {
+            normal_angle_base
+        };
         labels.insert(normal_angle_label.to_string(), normal_angle_exp);
 
-        let normal_x_label = format!("@nx{}", i);
+        let normal_x_label = format!("@{}nx{}", prefix, i);
         let normal_x_exp = Expression::function(
             FunctionType::Cos,
             Expression::ident(normal_angle_label.to_string()),
         );
         labels.insert(normal_x_label.to_string(), normal_x_exp);
 
-        let normal_y_label = format!("@ny{}", i);
+        let normal_y_label = format!("@{}ny{}", prefix, i);
         let normal_y_exp = Expression::function(
             FunctionType::Sin,
             Expression::ident(normal_angle_label.to_string()),