Intel's investment comes as part of an overall effort to boost the graphics performance of workstations and PCs that depend upon chips based around the Intel architecture. Earlier this year, Intel bought approximately 8 percent of workstation graphics chip maker Evans & Sutherland.
The company has also been actively working with Microsoft to recruit high-end workstation application vendors to port their Unix applications to the PC platform.
In 1998, the company also started to make lower-end graphics chips under its own name and finalized a purchase of notebook graphics specialist Chips & Technologies.
Think3's software designs objects, from home appliances and engine parts to children's safety products and custom cars. Its customers include a division of motorcycle-maker Harley-Davidson and automaker DaimlerChrysler AG.
Intel has been working with Think3 to improve the software's performance on computers that run on Intel chips. Both companies are based in Santa Clara, California.
Think3, formerly known as Cad.Lab, also said it secured $17.5 million in funding through Robertson, Stephens & Company's Omega Ventures.
Intel is an investor in CNET: The Computer Network, publisher of News.com.