Computer animation is skillfully creating moving images with the help of computer. Animating objects appear in a three-dimensional space. Skilled animation artists are in high demand in Movies, Television, Video Games, Medical visualizations and corporate presentations industries. Till now 3d cad technology is predominant in CAD Animation. But, recently researchers are spending much time on projects about 4d technologies. Every technology try to upgrade constantly and cad is no different. The new 4d technology is much emphasized on empowering project managers and engineers' role in managing and minimizing risk throughout all stages of a construction project; effectively communicate the design, schedule, and other project data and rapidly explore design and construction alternatives. During 1990s 2d and 3d of cad means advancement in visual representation of cad designs. It is just limited to graphics. At large we can access designs in various formats. The concept of 2d and 3d is just about animation and formats and soon 4d will be the new buzz in animation.
There are several advantages to having and creating animation, designs and drawings on a computer. Primarily, it gives the ability to easily add parameters that help in visualizing the drawing in several dimensions and from several angles. Another main advantage of having animation on the computer is the added ability to save time and costs when changes to the drawings have to be made and visualized. CAD programs make light work of such seemingly daunting tasks, which in the days before these CAD programs took a lot of time and added a lot of costs to a project.