Peanuts Underground Configuration Modeling And Visualization Simulation

This study belongs to the research field of virtual plant. The modeling and simulation of plant underground part of peanut is investigated.Peanut had the special physiological-biochemical characteristics and industrialization significance. It had good benefits in agricultural production and plant protection. The underground organs of peanut generally included:the root system, root nodule and pod. Because the peanut pods was growing in the ovary handle, and the ovary handle was growing from the stem, the stem and ovary handle were involved. At the same time, although the ovary handle was grown from the flower, in order to simplify the model, the flower was overlooked. The underground of peanuts included:the root system, root nodule, stem, ovary handle and the pod.In this topic, root nodule, stem ovary handle and pod were considered as the special root, but the growth and rooting points had their own growth characteristics. The root system of peanut was a typical straight root system; the growth and branching of root system followed the rule of fixed root. Root nodule was the ball which attached to the father root segment, its’ growing point was the parting point of the father root segment; and the root nodule’s radius is proportional to the age. The growth mechanistic models of stem and the ovary handle were similar with the root. But, the stem was treated as the root grown upward, ovary handle stop growing after the mitogentic of the pod. The growth mechanistic model of the pod was basically the same as the root, but the radial growth was different from it, which was decided by Newton interpolation curve, including the three direction movement:elongation, inflation and shrink. In the process of visualization, we use the triangularization of circular truncated cone to simulate roots, stems and ovary handle. because the nodule was seen as a small ball; use the patch method to draw it.Modelling simulation of distribution of peanut underground organ can provide the technical basic for visual and qualitatively analyzing its growth process and for researching its soil-plant-machine system. Original plant root model cannot simulate the growth of peanut underground organization. So there is a certain academic value to study the simulation system of peanut the underground system.On the basis of the experimental observations and material research, rearch topology structure and configuration characteristic of the peanut underground, set up the growth mechanistic model of peanut underground. Mainly established the growth mechanistic model of the pod and root nodule, integrated and unified the overground and underground parts of peanut.Based on the morphological characteristics of underground organs of peanut, peanut underground applying method of graphics builded visualization model of organization, primarily established general triangularization of circular truncated cone model appling in roots, stem, ovary handle, pod and root nodules, and nodule patch method model.Based on the OpenGL graphics library and MFC framework, the simulation system of peanut underground organizations developed on the basis of the original system. Simulation system included this function module of peanut underground organs which was growth mechanism, visualization, distributed computed. and coordinate transformation module, etc.Finally, experimental data got by peanut cultivation, processed these experimental data into branching and growth parameters needed on the simulation system and simulated it on the computer with the experimental data, then, did validate with output analog data whether the model is validaton.The constructed simulation system can be used for dynamic simulation of peanuts underground organs dynamic simulation and distribution calculation. Extended the model of pods extend, can be used to simulate the other abnormal root and abnormal stem, such as sweet potatoes, carrots, etc.