Procedural Animation Lecture 4: Basic modeling methods

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Presentation transcript:

Procedural Animation Lecture 4: Basic modeling methods Procedural Methods in 3D Computer Animation Dr. Midori Kitagawa

Basic Modeling Methods Lofting Extrusion Sweeping Surface of evolution Boolean operations

Lofting Originated in boat design 2D cross-sections placed in 3D space are connected by side faces to form a 3D shape.

Extrusion Also called projection A copy of a 2D profile is made and translated and then the original and copied profiles are connected by side faces to form a 3D shape.

Sweeping 2D cross-section is swept along a 3D path to create a 3D shape. http://www.cs.princeton.edu/courses/archive/fall99/cs426/assignment4/assignment4.htm

Surface of revolution 2D profile is rotated around an axis to create a 3D shape. http://www.cs.princeton.edu/courses/archive/fall99/cs426/assignment4/assignment4.htm

Boolean operations Boolean operation -- union (or, “u”), intersection (and, “n”), or difference (not, “-”) -- is applied to a pair of objects. A u B A n B A - B B - A

Boolean operations Can produce a complicated object with a repeated used of operations. Prone to computational errors. http://docs.pixologic.com/wp-content/uploads/2017/06/4R8_07.jpg