Steps Guide

1. Open "grass.max" file
2. Select "grass sample" object
3. Apply Bend modifier: angle=0.5, dir=90, Y axis
4. Second Bend: angle=8, dir=0, Z axis
5. Animate Bend Direction: 0 at frame 0, 360 at frame 100
6. Open Track View to edit Direction
7. Use Cuve Editor to create an endless animation
8. Unhide "Rectangle01" and "terrain" objects
9. Create Forest object using "Rectangle01" as the area
10. Geometry: width=700, height=300
11. Use "grass sample" as a Custom Object
12. Distribution: dense, 8000x8000, lock aspect ratio
13. Set camera to "Camera01". Enable "Use on Custom Objects" checkbox
14. Assign Surface to "terrain" object
15. Random Scale: 100% to 120%
16. Random Tint: 0% to 50%, default color range
17. Display: viewport simplification level = 2
18. Animation: "Random from Geometry", time offset=20, samples=4
19. Render video