An Introduction

You must have worked with or seen objects with solid appearance in computer-aided design programs. The solid feel is produced with the help of complex mathematical method known as Surface Modeling. With this method, one can visually scan a particular solid surfaced CAD object from chosen angles.

For architectural designing and rendering, surface modeling techniques is very popular. The method is leveraged for a diverse array of applications like structural part and body panel designing for aircrafts and vehicles, both land and marine.

Compared to wireframe modeling, the techniques used for object display in surface modeling are usually more complex. In this method, the object to be showcased is sually converted between different 3D modeling variants for seamless experience. This renders display the functions significantly less unclear over wireframe modeling and slightly less complex than solid modeling.

Processes Involved

  • Model is generated by melding 3D surfaces with solids
  • Model is converted with the aid of associative design to procedural surfaces
  • Surface analysis tools used to seek out imperfections in converted model
  • Model’s surfaces are rebuilt for applying smoothness to it
  • Beizer mathematical methods used in combination with B-splines for curve control

Surface models enjoy some properties unique to them. One such attribute is the inability to slice them open which is possible with solid models. In solid modeling, the objects used must conform to the geometrical norms. This is not the case with surface modeling where geometrically incorrect objects can also be worked upon. This makes the technique useful for developing 3D animation driven graphic intensive games.

Reasons to Use It

  • Ability to create Features where algorithm results in division by zero

    Often, you have come across a warning like ‘Invalid, Unable to Create Feature’ when issuing command for creating standard features such as a fillet. When drafting between different faces of the 3D models, similar problem sometimes arises. You would then resort to a different tool or tweaked setting to accomplish the task but despite repeated efforts, you may not experience success.

    The reason for this warning, mostly, is the generation of a self-intersecting face or edge when the mathematical calculation would result in an algorithmic deadlock characterized with division by zero. You can easily get around this issue using surface modeling.

    • Start by deleting the complex face or edges
    • Apply this techniques for reconstructing the complex face/ edge
    • Now stitch the newly generated surface to the existing design

    You would no longer come across any failure message.

  • Ability to Work Easily with Imported CAD models

    If you have imported models from different CAD programs or in third party formats, you have stumbled upon a situation where the feature details of the design are missing. The challenges experienced in altering such geometries are more particularly when the complexity of surfaces is high.

    With surface modeling, you can

    • Engage in deletion or replacement of model’s one or more faces
    • Make needful changes without any hassle
  • Ability to create organic shapes with high level of complexity

    On various occasions, you may not be able to generate a complex shapes by using solid modeling tools. This problem can be overcome with this techniques. Unlike solid modeling, the various facets of the shape are not build at one go with tools for surface modeling. At a time, you can go about building one face only. This helps in controlling the contour and face direction of the organic shape in the exact manner you have desired.

  • Ability to make surface geometries serve as references

    When creating surfaces, you are actually building the face of a model. But, direct construction is not the only purpose you can accomplish. Surface built can also double up as reference geometry. This is done in an intermediate stage during building of the desired model’s face.

  • Ability to leverage hybrid modeling methods

    When these techniques are blended for the purpose of creation of a solid model, it is known as Hybrid Modeling. In this advanced method, the model is started off as a solid and then surfaces are used for modifying the same. The solid model can also be changed to surfaces for the purpose of shaping and contouring it. Once done, the surfaces are changed back to solid.

    Surface modeling can prove to be more difficult compared to solid modeling as you have to work with a single face at one time. But the non-ability to work with several shapes at a time translates into the possibility of creating complex 3D designs which are not possible using solid modeling tools only.

    It is crucial to gain expertise of these techniques to enhance your modeling skills to create just anything you want. You need to gain further insights into the strengths and drawbacks of both techniques to be able to leverage any one of them or both to successfully handling different modeling scenarios.

    Understanding the strengths and weaknesses of both, enables you to assess which technique will be helpful in a given situation.


Solid modeling cannot be universally applied to handle needs of all 3D modeling types. After mastering this techniques, you must learn about surface modeling methods to consummate your 3D design skills. Alternately, you can seek the support of seasoned and proficient professionals of renowned 3d modeling companies like ThePro3DStudio for getting generated impeccable models within low turnaround.

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