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CNM 190: Proc. Animation

CNM 190: Proc. Animation. A simple way to make things move. Primary Motion. Create an object in Maya Select an input for the motion; Usually, time, available in Maya as frame or currentTime. Define a relationship between time passing and an attribute of the object changing.

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CNM 190: Proc. Animation

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  1. CNM 190: Proc. Animation A simple way to make things move

  2. Primary Motion • Create an object in Maya • Select an input for the motion; Usually, time, available in Maya as frame or currentTime. • Define a relationship between time passing and an attribute of the object changing. • Define other relationships between time passing and attribute.

  3. Motion Driven by Formulas • torus.translateY = frame; • torus.translateY = sin(frame); • torus.translateY = sin(frame)*cos(frame); • torus.translateY = $forward - $height*cos(frame); • torus.translateX = $forward*(frame) - $height*sin(frame); • Famous curves index: http://www-groups.dcs.st-and.ac.uk/~history/Curves/Curves.html

  4. Motion Driven by Data • Instead of using algebra, we can use samples of real-world events to control animation. • We can use pre-recorded data, such as music, images, water levels, motion capture. • I am not an expert on motion capture. • I capture balance data, though. • We can use live data, such as player input in a video game, RSS feeds or sensor input.

  5. Example: Ast • Six sources of data used: recordings of individual tracks of a jazz tune. • Using MEL scripts, we import each source into Maya as a set of key frames for a locator. • Using Expressions, we connect the locator node data to actual object parameters. • We can also use MEL for the reverse process, getting data out of Maya.

  6. From Data to Motion • One-to-One relation: value of one data stream sets parameter of a given attribute • Direct relation: value of one data stream scaled, summed, or manipulated by other algebraic means • Plural Direct relation: values of several data streams, manipulated by other algebraic means • Interpolated Direct relation: floating averages of a data stream control several attributes • Interpretive relation: Logic operations on data stream interpret data and set conditions.

  7. Secondary Motion • Some motions depend solely on the movements of parent bodies. These are by default procedural. • They still can express multiple inputs: Hair + moisture + time of day

  8. Motion Expresses Multiple Events • Motion is extremely expressive: it can convey many different channels at the same time. • Select an additional change over time besides time itself as an input, for example, the amount of sleep deprivation. • Use the change in sleep deprivation and time to change a character’s height. • Select more inputs as conditions for the character’s motion: food, money, interest, social factors, time of day.

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