Power Surfacing for Automotive Applications

Let’s face it – we all wanted to be car designers from our earliest days, many of us have drawn all manners of cars and imagined all sorts of fantastical vehicles – mainly ugly ones in my case!

SOLIDWORKS-Power-Surfacing-Automotive

Designing car bodies in practice is an expensive and time-consuming process involving designers (we used to call them “stylists”), clay modelers, feasibility engineers, ‘Body-in-White’ (BIW) engineers and manufacturing engineers. The objective is to create an attractive shape that fulfills the aesthetic and functional requirements of the car company – but creating that shape is not easy. Subtleties of how light interacts with the shape are crucial and so significant expertise and much time and money are invested in the process.

Since the early 90’s we have had CAD systems to help us and now the ‘master’ shapes are no longer locked into the physical tooling models (‘master models’) but are stored in CAD systems in the form of numerical surfaces. From this data, the engineering of dependent parts (body, chassis and trim) can be progressed. Ultimately, all forms of tooling (press tools, injection moulding tools, RIM tools etc.) can be manufactured from the CAD data. Capturing the crucial surface shape has evolved from spline based systems requiring a lot of care and time to more powerful systems available today.

Traditional methods ‘engineer’ the surfaces by laying out curves and then sweeping and lofting. Blends and fills can then be added. SOLIDWORKS can do this pretty well, but it can be time consuming and results in very long feature trees.

But there is an alternative – using the SOLIDWORKS Power Surfacing partner product. This is a tool that allows creation and manipulation of surfaces with ‘push and pull’ techniques. It is intuitive, easy to use and very fast – much faster for free-form work than with the conventional ‘multiple sketch and feature’ approach.

The underlying technology is called ‘SubD’ modelling meaning ‘Sub Division Modelling’. The method is based on a mathematical approach where a polygon is sub divided recursively to progressively form a smooth surface. The more sub divisions that are made, the smoother the surface. Typically, 3 – 6 sub divisions are sufficient to obtain very smooth shapes. There are several methods of doing this, but the ‘Catmull-Clark’ method is commonly used.

What’s the benefit of this? The answer is that the method creates surfaces that are automatically matched across all boundaries in tangency (‘C1’ continuity) AND curvature (‘C2’ continuity). Car bodies require C2 continuity (except for deliberate creases and styling lines) so tools that inherently create C2 continuous surfaces are hugely beneficial.

To demonstrate how Power Surfacing can be used to build automotive surfaces, I have recorded a Webcast series entitled ‘Power surfacing for Automotive Applications’ covering:

  1. Introduction including an illustration of how to design a bonnet shape.
  2. Free Form Design – showing how to create a complete exterior car body surface in 30 minutes!
  3. Working from Renders and Images – showing how I built an E-Type Jaguar.
  4. Using Scan Data – showing how you can create a sports car body from scan or digitised data.

Below is an animation of an E Type Jaguar that I built from images in a couple of hours.


By Andy Fulcher 
Technical Manager
Solid Solutions Management Ltd

Solid Solutions Technical Team
Solid Solutions commenced business as a SolidWorks Training and SolidWorks Support provider in 1998 and has consistently achieved strong growth year-on-year to become the UK’s leading SolidWorks 3D CAD reseller. Growth has been completely organic and has been consistently driven by a focus on recruiting the best from academia and industry and by delivering high quality services to more than 4,000 customers.Our customers range widely in size and are drawn from a broad spectrum of industry sectors. SolidWorks software is used by over 2 million engineers and designers across the world. As a company we are dedicated and focused at providing first class training and support to help you realise the best return on your investment.
Solid Solutions Technical Team
Solid Solutions Technical Team
  • Randy Simmons

    uhhhh…. how about using the SOLIDWORKS INDUSTRIAL DESIGNER TOOL!?!?!
    That is made by SOLIDWORKS!

    • Kalabalik

      Seems like that tool is becoming vaporware. Hasn’t heard a thing about it in years, and their presentation is the same since 2015 or something… 🙁

      • Randy Simmons

        They ARE continually UPDATING the Industrial Designer software. It is not “dead” in any way. New releases of it every 6 months actually.

        • Kalabalik

          Yet it’s impossible to find any decent info of it out in the wild. Barely any videos at all online, no possibility to try it out as demo. It’s as if they don’t want people to use it. All info is from 2015…