Toon Tree Tutorial

3D Model

1. Define a leaf shape brush, then scatter it with pure color at a disc stribution. Use single-sided material. Put the pivot at lower half
2. Create double-sided cross planes for leaf billboard
3. Creat the trunk
4. Particle system it on branches. I only used 32 instances. Weight paint where to grow these leaves. Go back to 1 to adjust the scale of the leaves.
5. Normal edit the leaf normals to a canopy-shaped sphere. Set MaxAngle < 90.

Credit: http://wiki.polycount.com/wiki/Foliage#Vertex_Normals