Material model-based method for simulating the appearance change of plant leaves

Abstract

The invention relates to the field of computer graphics, real-time non-photorealistic rendering and plant behavior simulation combination technology, and discloses a material model-based method for simulating the appearance change of plant leaves. The method comprises the following steps: S1, dividing the plant leaf into a four-layer structure including an epidermis layer, a palisade tissue layer, a spongy tissue layer and a hypodermis layer; S2, aiming at the four-layer structure, constructing a material model based on a plant leaf physiology factor; S3, simulating the spatial difference phenomenon of the plant leaf by regulating the pigment distribution of the leaf; and S4, simulating the temporal appearance change phenomenon of the plant leaf by regulating the pigment change rate. Modeling is conducted by fully considering that the action of physiology factors of the leaf structure and pigment and the like influencing the leaf appearance to the material of the leaf, so that not only can the modeling on spatially heterogeneous leaf reflection and transmission appearance characteristics be realized, but also simulation on the space change and time change characteristics can be conducted.

Description

technical field [0001] The invention relates to the technical field of combining computer graphics, real-time realistic rendering and plant behavior simulation, in particular to a method for simulating the apparent changes of plant leaves based on the apparent material model of plant leaves. Background technique [0002] In recent years, with the continuous development of agricultural information technology, 3D animation has gradually become an important means of agricultural knowledge popularization and technical training. 3D animation for agriculture not only needs to have realistic visual effects, but also needs to display agricultural knowledge correctly. Therefore, how to carefully combine 3D visual effects with agricultural knowledge has become an urgent problem to be solved. Leaf is one of the most important organs of plants. As the main photosynthetic organ of plants, the physiological significance of leaves to plants is self-evident. significance. At present, phys...

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Problems solved by technology

[0003] Essentially, the leaf appearance is determined by its internal mechanism and is also affected by the external environment. At present, most realistic rendering algorithms for plants [1, 2, 3] often only focus on leaf material and light. The physical effect of the model does not consider the influence of the leaf structure and the internal physiological function of the leaf on the leaf material. The parameters of these models are mostly physical parameters such as scattering coefficient and absorption coefficient, so it is difficult to apply to agricultural research; at the same time, this kind of method only It can obtain the appearance of the leaf at a single moment, but cannot realize the change of the appearance of the leaf when the leaf is aging

The method of Zhou et al. [4] uses the pigment content as a physiological factor to drive, which can be integrated with agricultural research, and simulates the aging of leaf color by adjusting the pigment content. However, the method ignores the description of leaf structure characteristics. It cannot simulate important appearance characteristics such as high-light reflection, transmission, and spatial heterogeneity of leaves, and the realistic effect is poor

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