A research of the UJI improves real-time visualization of trees in 3D videogames



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## A research of the UJI improves real-time visualization of trees in 3D videogames The work developed in the Interactive Visualization Centre contributes faster and more efficient vegetation design systems

27/09/2018 |
SCP

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A study developed in the Universitat Jaume I (UJI) will allow improving the realism of trees in 3D videogames thanks to the advance in the geometric representation of leaves of different forest species. The Interactive Visualization centre (CEVI), a research group led by Miguel Chover, professor of the Department of Computer Languages and Systems, has developed the work that has been published in the *Entropy* journal.

The conclusions obtained in this research “result in trees and plants with very few leaves that maintain the similarity with the original, thus enabling the creation of multiresolution models in real time”, says Chover. “By reducing the number of leaves, systems can go much faster than if you had to draw the whole tree, so it is possible to use it in real time”, says researcher Cristina Gasch. “In addition, by maintaining the similarity with the original tree, this method allows that as players move away from the tree or the plant in a videogame, these elements can have their leaves reduced without users to realize”, add the scientists.

The new method to represent vegetation in videogames developed in the CEVI “also allows its use to reduce the cost of drawing a tree or plant that is partially hidden by walls or fences, among other obstacles, because having covered leaves, these are the ones that first are eliminated”, points out the Professor of Computer Languages ​​and Systems of the UJI Miguel Chover.

The work developed by the CEVI team has consisted of designing a new method of simplification of plants and trees that allows a great improvement in visual appearance. For this, as Cristina Gasch explains, “The element is placed inside a geometric figure and an image is obtained from each corner of the figure. Depending on the geometric figure, the number of images obtained is greater or lesser. Then, a leaf is removed from the tree or plant and the images are obtained again”. The next step that the method performs is to compare the new images with the previous ones and give a value to that difference, which is called “error”. Then the removed leaf is added again and another is eliminated, repeating the process, and so with each one of the element's leaves.

Finally, when you already have the error of all the leaves, you look at the smallest one, which indicates that it is the leaf that, when eliminated, modifies the element to a lesser extent. When found, the researcher continues, “the leaf is definitively eliminated and the nearest leaf is scaled so that the leafiness of the plant or tree is not affected. Finally, the process is repeated until the element has been simplified to the extent that we need”.

The Interactive Visualization centre (CEVI), directed by Professor Miguel Chover, is a research group belonging to the Institute of New Imaging Technologies (INIT) of the Universitat Jaume I. Its scientific activity is related to computer games, automatic creation of 3D content, optimization and efficient management of geometry and devices and user interaction, visualization and tracking techniques.

Gasch, C.; Remolar, I.; Chover, M.; Rebollo, C. Viewpoint-Driven Simplification of Plant and Tree Foliage. *Entropy* **2018**, *20*, 213. <https://doi.org/10.3390/e20040213>

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