If you want to animate the Clouds, you can animate all the Gizmo to the direction you want, and Animate the "PHASE" parameter under the VOLUME FOG PARAMETERS. This will animate the volumetric effects of the clouds. You may need to play with your settings to comply with your design and projects. I may add a few animations of this tutorial, and also another cloud tutorial using a powerful plugin (Afterburn). Here's the Max file if you want to have my original file. If you have any comments please drop me a note. Feel free to ask questions about this technique in the 3ds Max forum at Creativecow.net. Have fun. Greg LaClOVisualAsylum Studios