why the tree generated is like this

i use PagedGeometry to render forest. Just like the example1 in the PagedGeometry, I try to render 1000 trees in the scene with tree model 2M size. But the speed is very slow, and the generated trees is very obscure(see the pic below). BTW, My pc's configuration is :
cpu: DualCore Intel Core 2 Duo E7400, 2800 MHz
display card: Zotac GeForce 9800 GTX+
memory: 3.2G
I wonder how to improve the speed and the display quantity?
If my tree model is larger than 20M, when I create 1000 trees in the scene, how large memory will require? Due to we only create tree one time Entity *myEntity = sceneMgr->createEntity("Tree", "bluespruce.mesh"); when call treeLoader->addTree(myEntity, position, yaw, scale);only the instance of the tree is drawed,right? But how large memory will require?

Try to keep the polygon count to around 1,500 - 3,000 in the tree mesh for reasonable performance. 500 - 1,000 poly tree meshes can look very good if modeled correctly. The issue with your leaves appears to be material related. Study the materials and textures that come with PagedGeometry to figure out what might be wrong.

-Fish

Try to keep the polygon count to around 1,500 - 3,000 in the tree mesh for reasonable performance. 500 - 1,000 poly tree meshes can look very good if modeled correctly. The issue with your leaves appears to be material related. Study the materials and textures that come with PagedGeometry to figure out what might be wrong.

-Fish
thank you very much.
BTW, which tool is free to model trees? I download some MAX model,but they are very large and I dont know how to reduce their points.

You can try Blender.

BTW, which tool is free to model trees?

tree[d] is a pretty awesome little tool to generate trees and it is free.

http://www.frecle.net/forum/viewtopic.php?t=780