1 files changed, 10 insertions, 2 deletions

diff --git a/assets/shaders/Cloud.vert.glsl b/assets/shaders/Cloud.vert.glsl
index 9a235349..c8ca9f3f 100644
--- a/assets/shaders/Cloud.vert.glsl
+++ b/assets/shaders/Cloud.vert.glsl
@@ -28,14 +28,22 @@ uniform mat4 u_worldMatrix;
 varying vec2    v_texCoord0;
 
 // constants
-const float zSpeed = 1.0;
+const float zSpeed = 2.0;
 
 
 void main()
 {
     // Transform position
         vec4 pos = vec4(a_pos,1);
-        //pos.z += u_time*zSpeed;
+        float dz = u_time*zSpeed;
+        float n = floor( dz/(u_zmax-u_zmin) );
+        dz -= n*(u_zmax - u_zmin);
+        float z = pos.z + dz;
+        if (z > u_zmax)
+        {
+                z = u_zmin + (z - u_zmax);
+        }
+        pos.z = z;
         gl_Position = u_projMatrix * u_mvMatrix * pos;
             
     v_texCoord0 = texcoord;