diff --git a/shaders/vertex.glsl b/shaders/vertex.glsl
index 317caa1..f8f0a7a 100644
--- a/shaders/vertex.glsl
+++ b/shaders/vertex.glsl
@@ -4,11 +4,11 @@ uniform vec4 uniform_color;
 out vec4 vertex_color;
 const mat4 to_draw_coordinates_matrix = mat4(
     1., 0., 0., 0.,
-    0., 1., 0., 0.,
+    0., -1., 0., 0.,
     0., 0., 1., 0.,
     -1, 1, 0, 1);
 void main()
 {
-    gl_Position = to_draw_coordinates_matrix*vec4(pos.x,-pos.y,pos.z, 1.0f);
+    gl_Position = to_draw_coordinates_matrix*vec4(pos, 1.0f);
     vertex_color = uniform_color;
 }