Do explicit rotation

1 files changed, 2 insertions, 2 deletions

diff --git a/data/explicit_rotation.vert b/data/explicit_rotation.vert
index f410305..8eb5b6c 100644
--- a/data/explicit_rotation.vert
+++ b/data/explicit_rotation.vert
@@ -5,8 +5,8 @@ uniform float rotation_angle;
 
 void main()
 {
-  gl_Position.x = z.x;
-  gl_Position.y = z.y;
+  gl_Position.x = z.x * cos(rotation_angle) - z.y * sin(rotation_angle);
+  gl_Position.y = z.x * sin(rotation_angle) + z.y * cos(rotation_angle);
   gl_Position.z = 0.;
   gl_Position.w = 1.;
   gl_PointSize = 32.;