在 3ds max 里制造风，再把它放在树木物件上。这样就可以了，当风改变其方向或强度时，SpeedTree 就会自动帮你随风调整。我们也包含了风量值 ( wind scalar value )，只是以防万一场景里的什麽东西正在使用相同的风物件时，这样我们就不需要使用相同的组件了。
3D Tree and Forestry Tools for 3ds Max and VIZ
A powerful plug-in for creating realistic trees in 3ds Max and Autodesk Viz. SpeedTree creates relatively low poly trees for fast rendering time and foresting.
SpeedTree 4 is now shipping with the following new features:
Real-time modeling feedback.
Improved Curve Editor.
Multiple texture layers supported.
Latest version of SpeedTree CAD Lite (version 220.127.116.11)
Roots branch level added.
Light Seam Reduction.
Support for 3ds max 4.x through 9 (32 bit).
Multi-Level wind effects.
Show normals added to the view menu.
Animated LOD preview.
Tree Libraries have normal maps for branches and leaves with all new textures to take advantage of SpeedTree 4 features.
SpeedTree 4 is a powerful plug-in for creating low to medium polygon count trees. In most other tree plug-ins, trees start at about 10,000 polygons and go up. The average SpeedTree tree has around 5,000 polygons. As such, you can create a lot more speedtree trees in your scene. In addition, SpeedTree 4 also fully supports wind animation within the tree for a highly realistic look in your animations.