Research On Key Technologies Of Virtual 3D Rendering Based On Force Feedback Technology

In the field of industrial design,the life cycle of products is shortened,and the trend of customer's pursuit of personalization is strengthened.The appearance of the product style in the minds of consumers occupy an increasingly important position.As a computer-aided industrial design method,virtual product surface rendering technology allows the designer to use modern information technology for various creative activities of industrial areas,and it has brought great changes for the traditional design of surface in design method,process,quality and efficiency.So it has a great significance for the study of 3D rending key technologies.In this paper,a novel method of 3D model surface rending is proposed by applying force feedback technology to virtual painting processe.Firstly,the relationship between force and the brush deformation is analyzed,and the spring-mass model is applied to construct the 3D brush model.The skeleton and surface deformation algorithm of brush model are constructed.Then,the collision related points are found by the most enclosing ball of the deformed brush,and the average normal vector of the collision point is calculated to determine the projection plane.According to the deformation of the 3D brush,the contour control point coordinate of brush footprint on the plane is calculated.The raindrop shape strokes are fitted on the projection plane by using B spline curves and the 3D brush footprint is obtained by projecting the 2D brush footprint onto the 3D object surface in real time.There is a positive correlation between the amount of ink and force on the brush and the ink is stuffed into brush footprint.At the same time,the specific complete calligraphy effect 3D brush stroke is obtained by superimposing 3D brush footprints along the painting direction and controlling the stress of the brush.The virtual rendering system based on the force feedback technology is developped in this paper.The 3D painting is implemented in this system with a Phantom Desktop haptic device.The simulation results show that this method reproduces force control process in 3D rending process,which can effectively enhance reality to users and provide some reference for the decoration of industrial products.