Research On Geometric Modeling And Growth Visualization Simulation Technology Of Anthurium Flower

With the rapid development of cut flower industry,anthurium has been widely used in cut flower production due to its high ornamental value and application value.Therefore,it is of great significance to establish a visual model of anthurium growth to guide cut flower production and help researchers understand the growth law of anthurium.At present,point cloud reconstruction is usually used to construct geometric models of plants.Although point cloud technology can highly restore the original state of plants,since plant growth is full of randomness,the growth state of different plants of the same kind of plant is not the same,and point cloud technology has problems such as large computational complexity,high requirements for computing power of machines and difficult access to point cloud equipment.Geometric construction has the characteristics of fast calculation and self-defining parameters,which provides technical support for the realization of anthurium model.However,the geometric method has the problem that the parameters cannot be defined accurately,which will lead to the failure to highly restore the authenticity of plant organs.Because of the different growth processes of flowers,the methods of growth modeling can not be unified.The growth law of anthurium is complicated,so it is difficult to simulate the growth state of the anthurium at each stage.The traditional fractal method can be used to simulate the morphological changes in the natural growth process,but it is unable to accurately express the spatial position of organs and the relationship between organs.To solve the above problems,this paper studies the visualization of anthurium growth based on geometric modeling and L-system,proposes an inverse control point method based on anthurium characteristics and establishes anthurium organ model.Based on this model,a differential L-system based on the growth law of anthurium was proposed,which can effectively simulate the topological structure and growth process of anthurium.In addition,virtual organs are introduced to accurately represent the geometric properties and location information of the anthurium organs.This method can effectively reduce the complexity of the differential L-system.Through experimental verification,the method proposed in this paper can effectively model the growth process of anthurium,and can provide guidance for the production of anthurium and reference for visualization research of other flowers.The main research contents of this paper are as follows:(1)Put forward the geometric construction method of anthurium organ.By studying the three-dimensional morphology of various organs of anthurium,appropriate geometric tools were used for modeling according to its characteristics.For anthurium petioles and scapes,the axes of the petioles were constructed using quadric Bezier curves,and then the proper radius was selected to scan and shape around the axes.For the core organs such as leaf and flame bud,bicubic NURBS surface was selected for modeling.Through reverse engineering,node vector was determined,tangent vector conditions were added,and finally NURBS surface equation was obtained by solving.For the regular ellipsoid of spikelets,the NURBS curve was used to construct its edge line and then rotated.For anthurium root system,oval cylinders with different upper and lower radii were used to simulate the root segment.The anthurium organs of different stages can be constructed through the movement of control points,which has certain reference value for plant geometric modeling.(2)Proposed the illumination rendering model of anthurium.On the basis of geometric model,color rendering,texture mapping and light rendering are performed.For the organ with a single color,such as petiole,color rendering is carried out by obtaining its RGB value.For the organs with complex texture,such as leaves and flame buds,appropriate materials were selected for texture mapping.Finally,in order to get the real shadow effect after light,a light model based on the change of time and light intensity was established,which made the anthurium model more real and natural.(3)Fitting the growth data of anthurium,establishing the growth function of anthurium,and establishing the growth model of anthurium based on differential Lsystem.For the real anthurium data collected,linear regression was combined to fit the data,and polynomial function form was selected to obtain the growth function.Then,according to the growth law of anthurium,the initial conditions and a series of production rules of L-system were determined.By introducing time variable,the evolution rules of L-system can be expanded into differential equations,which can describe the morphological change and growth process more precisely.(4)Construct virtual organ model.In order to make up for the deficiency of the differential L-system in describing the spatial position of plants,the virtual organ model is introduced.This model has a more detailed description ability,and can accurately represent the geometric and spatial information in the process of organ growth,as well as the position relationship between different organs.As an extension of differential Lsystem,the computational complexity is reduced effectively.(5)The interactive visualization system of anthurium flower growth was designed and realized.The Web GL rendering engine is used for development and implementation,integrating growth data monitoring and custom parameter anthurium module,which can observe the growth of various organs in the process of anthurium,and observe the anthurium model generated under custom parameters.By modeling the growth process of anthurium,the visualization system is formed,which can help agricultural producers to predict and master the growth change rule of anthurium,and has certain reference value for guiding the research and planting production of anthurium.