diff --git a/src/cam.c b/src/cam.c
index 091d5e3..bc9fbc4 100644
--- a/src/cam.c
+++ b/src/cam.c
@@ -5,14 +5,14 @@
 
 Mat4f_t perspCam(float fov, float asp, float near, float far)
 {
-    const float t = 1.f / tanf(fov*0.5f);
-    const float fn = near - far;
+    const float t = 1.f / tanf(fov * 0.5f * (M_PI/180.f));
+    const float fn = far - near;
     const float persp[16] = 
     {
         t/asp,  0.f, 0.f,                               0.f, 
         0.f,    t,   0.f,                               0.f,
-        0.f,    0.f, (far + near) / fn,                 -1.f,
-        0.f,    0.f, (2.f * far * near) / fn,           0.f
+        0.f,    0.f, -(far + near) / fn,                 -1.f,
+        0.f,    0.f, -(2.f * far * near) / fn,           0.f
     };
 
     return mat4f_from_array(persp);
@@ -48,14 +48,11 @@ Mat4f_t lookAt(Vec4f_t* eye, Vec4f_t* center, Vec4f_t* up)
     Vec4f_t u = vec4f_cross(s, f);
     u.data[3] = 0.f;
 
-    const float m[16] = {
-        s.x,  u.x,  -f.x,  0.f,
-        s.y,  u.y,  -f.y,  0.f,
-        s.z,  u.z,  -f.z,  0.f,
-       -vec4f_dot(s, *eye),
-       -vec4f_dot(u, *eye),
-        vec4f_dot(f, *eye),
-        1.f
+    float m[16] = {
+        s.x,  s.y,  s.z,  -vec4f_dot(s, *eye),
+        u.x,  u.y,  u.z,  -vec4f_dot(u, *eye),
+        -f.x, -f.y, -f.z, -vec4f_dot(f, *eye),
+        0.f,   0.f,  0.f,                 1.f
     };
 
     return mat4f_from_array(m);
diff --git a/src/main.c b/src/main.c
index 90aa6ee..4f9c8b4 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1,28 +1,17 @@
 #include <stdio.h>
 #include "cam.h"
-#include "math/vec4.h"
-
-Vec4f_t mat4f_mul_vec4f(const Mat4f_t mat, Vec4f_t v)
-{
-    Vec4f_t out;
-    for (int i = 0; i < 4; i++)
-    {
-        out.data[i] = 0.f;
-        for (int j = 0; j < 4; j++)
-            out.data[i] += mat.m[i*4 + j] * v.data[j];
-    }
-    return out;
-}
+#include "draw.h"
+#include "math/mv4.h"
 
 int main(int argc, const char** argv)
 {
     const float fov = 60;
-    const float width = 1000, height = 800;
+    const float width = 80, height = 30;
     const float near = 0.1, far = 1000;
 
     const float aspect = width / height;
 
-    // xyz = [-1, 1]
+    // xyz = [-1; 1]
     Vec4f_t vec = vec4f(0.f, 0.f, -1.f, 1.f);
     Mat4f_t proj = perspCam(fov, aspect, near, far);
 
@@ -30,9 +19,10 @@ int main(int argc, const char** argv)
 
     normCoord_r(&v_clip);
     viewport_r(&v_clip, width, height);
-
-    printf("Screen coordinates: x = %f, y = %f, z = %f\n",
-        v_clip.x, v_clip.y, v_clip.z);
-
+    
+    initCanvas(width, height);
+    drawCanvas(v_clip, width, height);
+    renderCanvas(width, height);
+    printf("%f", v_clip.z);
     return 0;
 }
\ No newline at end of file