tailieunhanh - Lecture Autodesk inventor: 3D modeling and display

In this chapter, students will be able to understand the terminology used in 3D modeling, define the most popular types of 3D modeling systems, apply Boolean operations to 3D objects, understand the role planning plays in building a constraint-based model. | 3D Modeling and Display 3D Model Types Wireframe Surface Solid Parametric Wireframe Models 3D model created with ordinary lines, circles, arcs, etc., to represent edges Only vertex and edge data is stored No shading, hidden line removal Surface Models Model with surface objects Meshes frequently used to represent surfaces Surface, edge, & vertex information stored Shading, hidden line removal Useful for modeling shapes with complex curvature (., hull forms, airfoils, automobiles) (10,100,100) (0,0,0) X Z Surface Model - 6 meshed surfaces Solid Models Model with solid objects (., primitives, sweeps) Database contains information about vertices, edges, surfaces, and the space enclosed by the surfaces Mass and material properties Interference checking Shading and hidden line removal (100,100,100) (0,0,0) X Z Solid Model - 1 primitive 3D Display Wireframe Hidden line / hidden surface Shaded Rendered NOTE:Display refers to the way that 3D objects appear on the display device (., the computer monitor) Wireframe Display Model edges and contours are visible (Model may be wireframe, surface, solid or parametric) Simpler and faster than shaded display Trade-off between complexity and speed Hidden Line/Surface Display Without hidden lines removed With hidden lines removed Hidden line/surface removal - class of algorithms used to determine model edges, surfaces, or volumes that are visible or invisible from a particular viewpoint wireframe wireframe surface surface solid solid Shaded Display Display technique that hides hidden lines and applies flat colors to visible surfaces Rendered Display Single, shaded view of a 3D model to which colors, materials, textures and lighting have been added 3D Modeling and Display Akahaw . | 3D Modeling and Display 3D Model Types Wireframe Surface Solid Parametric Wireframe Models 3D model created with ordinary lines, circles, arcs, etc., to represent edges Only vertex and edge data is stored No shading, hidden line removal Surface Models Model with surface objects Meshes frequently used to represent surfaces Surface, edge, & vertex information stored Shading, hidden line removal Useful for modeling shapes with complex curvature (., hull forms, airfoils, automobiles) (10,100,100) (0,0,0) X Z Surface Model - 6 meshed surfaces Solid Models Model with solid objects (., primitives, sweeps) Database contains information about vertices, edges, surfaces, and the space enclosed by the surfaces Mass and material properties Interference checking Shading and hidden line removal (100,100,100) (0,0,0) X Z Solid Model - 1 primitive 3D Display Wireframe Hidden line / hidden surface Shaded Rendered NOTE:Display refers to the way that 3D objects appear on the display device (., the computer monitor) Wireframe Display Model edges and contours are visible (Model may be wireframe, surface, solid or parametric) Simpler and faster than shaded display Trade-off between complexity and speed Hidden Line/Surface Display Without hidden lines removed With hidden lines removed Hidden line/surface removal - class of algorithms used to determine model edges, surfaces, or volumes that are visible or invisible from a particular viewpoint wireframe wireframe surface surface solid solid Shaded Display Display technique that hides hidden lines and applies flat colors to visible surfaces Rendered Display Single, shaded view of a 3D model to which colors, materials, textures and lighting have been added 3D Modeling and Display Akahaw Huwa!