The use of 3D CAD Modeling has revolutionized the working of The AEC Associates 3D CAD Drawing Services during the past two decades. 3D CAD drawing services can use one of the three types of 3D models as per their choice and requirements. A wireframe model is the simplest form of 3D models, it provides only an extended form of 2D orthographic projections. Despite being far superior than the 2D projections, it still has its limitations. The other two types of 3D models are surface and solid models. We shall discuss 3D surface models in detail here.
A surface model is more complex than a wireframe model and is used mostly when exterior surfaces of a structure are more important. In these cases, 3D CAD drawing services don’t yet need to consider the interior forms.
3D surface modeling is used to represent solid looking objects. This model is more complex than a wireframe model, but not as sophisticated and complete as a 3D solid model. It cannot be sliced open as a solid model to show interior spaces. An object in the surface modeling can still be geometrically incorrect despite a proper appearance.
As stated above, a surface model is useful only in the projects where exteriors are more important. 3D CAD drawing services can obtain a surface model from a wireframe model by adding surfaces to the wireframe if a more comprehensive view is required at any stage of design process. Surface modeling is advantageous for the designers as it gives the appearance of the structure from outside without bothering to go into the interior detailing. It has to be clear that there can be clash of various design elements, especially when a very complex structure is being used. So, it is not suited for working on such structures.
Creating surface models
You can create a surface model using one of the two methods. In the first method, you first create construction curves or splines and then sweep or mesh through three dimensional surfaces from them. In the second method, surfaces are directly created by manipulation of the surface poles which are usually called the control points. The shape of the surface is defined by these control points. Other surfaces are then created from these initially created surfaces and the surface model is given its final shape.