Yes, there are several software packages that can be used to create a plant growth model that simulates the 3D structure of the plant and takes into account the amount of light that falls on every leaf. Some of these software packages include:

* AMAPSim: This software is a structural plant growth model that is based on a botanical theory. It can simulate the growth of a plant's branches, leaves, and roots, and it can take into account the amount of light that falls on each leaf.
* GreenLab: This software is a more comprehensive plant growth model that can simulate the growth of a plant's entire life cycle. It can take into account a variety of factors, including the amount of light, water, and nutrients available to the plant, as well as the plant's genetic makeup.
* StemGL: This software is a more specialized plant growth model that is designed to simulate the growth of tree stems. It can take into account the amount of light, wind, and water stress that the tree is exposed to.

These are just a few of the many software packages that are available for plant growth modeling. The best software package for you will depend on your specific needs and requirements.

In addition to the software packages mentioned above, there are also a number of open-source plant growth modeling software packages available. These software packages are often free to use and modify, and they can be a good option if you are on a budget or if you want to have more control over the modeling process.

One open-source plant growth modeling software package is the **Plant Growth Modelling Toolkit (PGTK)**. This software package is based on the GreenLab model, and it can be used to simulate the growth of a variety of plants, including crop plants, trees, and shrubs.

Another open-source plant growth modeling software package is the **LUXSim**. This software package is designed to simulate the growth of leaves, and it can be used to study the effects of light, CO2, and temperature on leaf growth.

If you are interested in creating a plant growth model, I recommend that you do some research to find the software package that is right for you. There are many factors to consider, such as the complexity of the model you want to create, your budget, and your level of expertise.
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