  In some entertainment and virtual reality applications, it is necessary to
model and draw the real world realistically, so as to improve the fidelity of
natural scenes and make users have a better sense of immersion. However, due to
the morphological structure of trees The complexity and variety present many
challenges for photorealistic modeling and rendering of trees. This paper
reviews the progress achieved in photorealistic modeling and rendering of tree
branches, leaves, and bark over the past few decades. The main achievement is
mainly a rule-based procedural tree modeling method.
