Update app.py

app.py

@@ -488,7 +488,7 @@ iface = gr.Interface(
         gr.Slider(minimum=0, maximum=1.0, value=1.0, label="Depth Far"),
         gr.Slider(minimum=0.1, maximum=1.0, value=0.3, label="Thickness"),
         gr.Slider(minimum=0, maximum=1.0, value=0.05, label="Alpha"),
-        gr.Slider(minimum=0.01, maximum=0.1, value=0.01, label="BackSheet Thickness")
+        gr.Slider(minimum=-0.1, maximum=0.1, value=0.01, label="BackSheet Thickness")
     ],
     outputs=gr.File(label="Download STL File"), # Use gr.File() for file downloads
     title="Image to 2.5D Relief Model Generator",