Practical Effects vs CGI

When a dragon swoops across the screen or a spaceship flies past, how does it happen? Filmmakers use two main toolkits.

Practical Effects

Practical effects are made in the real world. They include:

• Models and miniatures: Small buildings, vehicles, and landscapes filmed up close.
• Puppets and animatronics: Mechanical creatures moved by operators.
• Makeup and costumes: Transforming actors into creatures or characters.
• Stunts and explosions: Carefully planned and performed by trained professionals.

CGI

CGI stands for computer-generated imagery. Artists build digital models and animate them. They can create enormous crowds, fantastic creatures, and places that could never be built.

Green Screen

Actors perform in front of a green or blue background. Computers later replace it with a different setting.

Best of Both Worlds

Many films mix the two. Jurassic Park (1993) used animatronic dinosaurs and computer animation together. Star Wars (1977) relied on detailed models and was a key moment in the growth of Industrial Light & Magic, a famous effects company.

Miniatures at Large Scale

Some filmmakers build very detailed miniature models of castles, ships, and cities and film them carefully so they look huge. The Lord of the Rings films used large-scale models, which the production crew called bigatures, to show enormous fortresses and landscapes.

Motion Capture

Motion capture records the movements of a real actor wearing a special suit with markers. Computers then use the data to move a digital character, so the performance feels natural. It is a good example of how practical acting and computer effects can work together.

Why Filmmakers Still Use Practical Effects

Actors react more naturally when something real is in front of them, whether it is a puppet, a costume, or a set. Practical effects also give light and shadow something real to fall on, which can make an image look more convincing.

Which Is Better?

Neither. Practical effects can feel solid and real, while CGI offers almost unlimited freedom. The best results often come from using each where it works best.

Spot the Effect

Next time you watch a film, try to guess how each effect was made. Then look up behind-the-scenes videos to find out.