Research On Bump Texture Rendering Technology For Educational Applications

With the development of the information age,information technology has been widely used in people's learning and life,and the proportion of computer-aided instruction in education has also increased.VR(Virtual Reality)technology is also more used in teaching activities,which can fully mobilize students' sensory feelings,so that students can learn quickly in the immersive experience.This also makes the virtual scene rendering involved in VR technology have important research significance.Bump mapping is one of the most important technologies in virtual scene rendering.It can draw the detailed information of the model surface,get the rough visual feeling,and increase the realistic feeling of the model.Early bump mapping techniques used perturbation functions to change the normal vectors of the points on the surface of the object to obtain the roughness of the model surface,while the geometric properties of the model surface remained unchanged,and its surface remained smooth.On this basis,the point multiplication bump mapping technology is developed to extract normal information from the input normal texture.The illumination model calculates the normal of each vertex on the surface of the model by extracting normal information,which reduces a series of calculation of normal texture from the height texture,and does not change the geometric properties of the object surface.Because of the small amount of calculation,the calculation speed is fast.It is widely used in real-time systems.This paper optimizes the problem that point multiplication bump mapping technology can not simulate the rough feeling of object surface when the light is sufficient.Firstly,this paper simulates the reality and roughness of the object surface when the light is abundant,so that the roughness and reality of the drawn object surface will not be weakened with the increase of light.Then,the concave-convex coefficient is innovatively introduced,so that the concave-convex factor can be adjusted in real-time rendering to achieve a more satisfying rendering effect.Finally,according to the above optimized point multiplication bump mapping technology combined with educational applications,a game for testing three-dimensional visual sensitivity is designed,and the research topic of this paper is applied to practical teaching work.Firstly,aiming at the problem that the light-dark boundary of the standard illumination model is obvious,and the bump mapping effect is dim due to the low brightness of the high-light area,which can not simulate the visual effect when the light is sufficient.According to the various illumination rendering effects,the semi-Lambert illumination model is used to replace the diffuse reflection illumination model,and the Binn-Phong illumination model is used to replace the Phong illumination model.The illumination model simulates the illumination effect when the light is sufficient.On the basis of the previous step,the point multiplication bump mapping technology is improved.By using the improved illumination model in point multiplication bump mapping technology,the rough and realistic surface of the object is simulated when the light is sufficient.On this basis,the concave-convex coefficient is introduced.When the improved illumination model is used,the concave-convex feeling on the surface of the rendered model may be weakened.At this time,the concave-convex factor can be adjusted to achieve a better concave-convex feeling,which makes the rendering effect of the improved point multiplication bump mapping technology have a more obvious sense of roughness and reality.In addition,the concave-convex coefficient can also be used to adjust the concave-convex degree of the model surface in real-time rendering,so as to achieve a more satisfying rendering effect.Finally,combining the improved point multiplication bump mapping technology with educational application,and using bump mapping technology,a game for testing three-dimensional visual sensitivity in the field of preschool education is designed,which is mainly used to check the visual perception sensitivity of the subject to the roughness of the object surface.This game can help teachers and parents find out children's visual problems as soon as possible,and judge whether the three-dimensional visual sensitivity of the subjects is normal according to the test results.