What is 3D Surface Modelling | Types Of Surfaces

Define Surface Model

Surface models are created by connecting various surface elements to represent part geometry. A surface model can be built from a wire frame model by defining the surfaces. They hold the description of an object in terms of points, edges and faces between the edges. Surface modeling systems are able to calculate surface intersections and surface areas and some systems are capable of producing shaded images and removing hidden lines automatically.
Surface models may be constructed using a large variety of surface features often provided by many CAD systems. The plane is the most basic feature to represent a surface element. More complex shapes can be defined by tabulated cylinders, ruled surface, surface of revolution, surface sculptured, sweep surface and fillet-surfaces.

3D Surface Model

A surface model can be used to represent the surface profile of these objects.

1. Surface models are created using points, lines, and planes.
2. It is more complete and less ambiguous representation than its wire frame model
3. It is an extension of a wire frame model with additional information.
4. A wire frame model can be extracted from a surface model by deleting all surface entities
5. Databases of surface models are centralized.
6. Hence, manipulation of surface entities in one view is automatically reflected in the other views.
7. Surface models can be shaded and represented with hidden lines

Applications of surface models.

1. Calculation of mass properties
2. Checking interference between mating parts
3. Generating cross-sectioned views
4. Generating finite element mesh
5. Generating NC tool paths for continuous path machining.

Types Of Surfaces

1) 3dface

Allows creation of three or four sided surfaces by picking points in a clockwise or counter clockwise manner
Must have three corners but not more than four

2)3dmesh

• Mesh is defined in rows and columns
• Each vertex is given an xyz coordinate

3)Edgesurf

• Construct a 3d mesh between 4 edges
• Edges can be lines, plines, splines or arcs
• Ends must meet precisely

4)Rulesurf

Objects can be points, lines, arcs, circles, polylines, splines, enclosed objects or a single plane Useful for surfacing holes, fillets, or flat surfaces–be sure to select both on same end Tabsurf.

5)Revsurf

• Draw a profile and rotate that profile around an axis to create a symmetrical object
• Path curve can be lines, arcs, etc.
• Rotation axis can be a line or an open polyline.

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