diff --git a/demos/99-geom.c b/demos/99-geom.c
index 0a4cea9..1096511 100644
--- a/demos/99-geom.c
+++ b/demos/99-geom.c
@@ -21,6 +21,7 @@ int main() {
         if (input(KEY_F5)) window_reload();
 
         shader_bind(program);
+        shader_float("t", (float)window_time());
         mesh_render_prim(&m, GL_POINTS);
     }
 
diff --git a/demos/art/shaders/geom-test/line.glsl b/demos/art/shaders/geom-test/line.glsl
index 26560ba..0086d75 100644
--- a/demos/art/shaders/geom-test/line.glsl
+++ b/demos/art/shaders/geom-test/line.glsl
@@ -1,12 +1,14 @@
 #version 330 core
 layout (points) in;
 layout (line_strip, max_vertices = 2) out;
+
+uniform float t;
   
 void main() {    
-    gl_Position = gl_in[0].gl_Position + vec4(-0.1, 0.0, 0.0, 0.0); 
+    gl_Position = gl_in[0].gl_Position + vec4(-0.1 + sin(t)*0.1, 0.0, 0.0, 0.0); 
     EmitVertex();
 
-    gl_Position = gl_in[0].gl_Position + vec4( 0.1, 0.0, 0.0, 0.0);
+    gl_Position = gl_in[0].gl_Position + vec4( 0.1 - sin(t)*0.1, 0.0, 0.0, 0.0);
     EmitVertex();
     
     EndPrimitive();
diff --git a/engine/v4k.html b/engine/v4k.html
index 25307ac..bb9b7e2 100644
--- a/engine/v4k.html
+++ b/engine/v4k.html
@@ -596,7 +596,7 @@ details > summary::-webkit-details-marker {
 |Version:       | 2023.7      |
 |:--------------|:------------|
 |Branch:        | main           |
-|Commit:        | 69               |
+|Commit:        | 70               |
 <!--| Documentation last modified | { {LAST_MODIFIED} } |-->
 
 # [V·4·K 2023.7     ](https://dev.v4.games/zaklaus/v4k)