diff --git a/inc/mat4.h b/inc/mat4.h
index fffbba0..155d53c 100644
--- a/inc/mat4.h
+++ b/inc/mat4.h
@@ -6,7 +6,7 @@
 /*   By: gbrochar <gbrochar@student.42.fr>          +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2020/12/22 20:35:00 by gbrochar          #+#    #+#             */
-/*   Updated: 2020/12/23 10:50:09 by gbrochar         ###   ########.fr       */
+/*   Updated: 2020/12/23 16:11:16 by gbrochar         ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -14,14 +14,30 @@
 # define MAT4_H
 
 typedef struct s_mat4		t_mat4;
+typedef struct s_persp_tool	t_persp_tool;
 
 struct						s_mat4
 {
 	double					data[16];
 };
 
+struct						s_persp_tool
+{
+	double					xmin;
+	double					xmax;
+	double					ymin;
+	double					ymax;
+};
+
 t_mat4						mat4_transpose(t_mat4 m);
+
 t_mat4						mat4_multiply(t_mat4 m, t_mat4 rhs);
 t_mat4						mat4_multiply_tmp(t_mat4 m, t_mat4 rhs);
 
+t_mat4						mat4_perspective(
+	double fov, double aspect, double near, double far);
+t_mat4						mat4_frustrum(
+	t_persp_tool tool, double near, double far);
+t_mat4						mat4_frustrum_tmp(double x, double y, t_vec4 tool);
+
 #endif
diff --git a/inc/vec4.h b/inc/vec4.h
new file mode 100644
index 0000000..797ca55
--- /dev/null
+++ b/inc/vec4.h
@@ -0,0 +1,26 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   vec4.h                                             :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: gbrochar <gbrochar@student.42.fr>          +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2020/12/23 15:57:23 by gbrochar          #+#    #+#             */
+/*   Updated: 2020/12/23 16:00:12 by gbrochar         ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#ifndef VEC4_H
+# define VEC4_H
+
+typedef struct s_vec4		t_vec4;
+
+struct						s_vec4
+{
+	double					x;
+	double					y;
+	double					z;
+	double					w;
+};
+
+#endif
diff --git a/src/mat4_perspective.c b/src/mat4_perspective.c
new file mode 100644
index 0000000..a32cac5
--- /dev/null
+++ b/src/mat4_perspective.c
@@ -0,0 +1,64 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   mat4_perspective.c                                 :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: gbrochar <gbrochar@student.42.fr>          +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2020/12/23 15:52:55 by gbrochar          #+#    #+#             */
+/*   Updated: 2020/12/23 16:11:07 by gbrochar         ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "mat4.h"
+#include "vec4.h"
+
+t_mat4				mat4_frustrum_tmp(double x, double y, t_vec4 tool)
+{
+	t_mat4			ret;
+
+	ret.data[0] = x;
+	ret.data[4] = 0;
+	ret.data[8] = tool.x;
+	ret.data[12] = 0;
+	ret.data[1] = 0;
+	ret.data[5] = y;
+	ret.data[9] = tool.y;
+	ret.data[13] = 0;
+	ret.data[2] = 0;
+	ret.data[6] = 0;
+	ret.data[10] = tool.z;
+	ret.data[14] = tool.w;
+	ret.data[3] = 0;
+	ret.data[7] = 0;
+	ret.data[11] = -1;
+	ret.data[15] = 0;
+	return (ret);
+}
+
+t_mat4				mat4_frustrum(t_persp_tool tool, double near, double far)
+{
+	double			x;
+	double			y;
+	t_vec4			tool2;
+
+	x = (2.0 * near) / (tool.xmax - tool.xmin);
+	y = (2.0 * near) / (tool.ymax - tool.ymin);
+	tool2.x = (tool.xmax + tool.xmin) / (tool.xmax - tool.xmin);
+	tool2.y = (tool.ymax + tool.ymin) / (tool.ymax - tool.ymin);
+	tool2.z = -(far + near) / (far - near);
+	tool2.w = (-2.0 * far * near) / (far - near);
+	return (mat4_frustrum_tmp(x, y, tool2));
+}
+
+t_mat4				mat4_perspective(
+	double fov, double aspect, double near, double far)
+{
+	t_persp_tool	tool;
+
+	tool.ymax = near * tan(fov / 2.0);
+	tool.ymin = -tool.ymax;
+	tool.xmin = tool.ymin * aspect;
+	tool.xmax = tool.ymax * aspect;
+	return (mat4_frustrum(tool, near, far));
+}