These can be output as line drawings. Rendering Once you have your two-dimensional views chosen, you may want to render them. You choose light sources and other effects, then create a photograph-like image, rather than a line drawing, of the object. This involves a lot of computation. Animation Animation is simply a series of still images presented rapidly, one after the other.
Tools intended for animation add a little more, though.
They can also change the shape or colour of objects, or the relationship of their parts, over time. They then automatically render each still image in sequence. This invilves even more computation than rendering an individual image. These programs can be used to design buildings, but they are also used to design many other things such as commercial artwork and posters. Photoshop and Illustrator Photoshop and Illustrator by Adobe are the canonical paint and drawing programs, respectively.