Upcoming Deadlines Homework #9 – Stop-motion Character Animation Due Wednesday, November 3 rd...

Click here to load reader

  • date post

  • Category


  • view

  • download


Embed Size (px)

Transcript of Upcoming Deadlines Homework #9 – Stop-motion Character Animation Due Wednesday, November 3 rd...

  • Upcoming DeadlinesHomework #9 Stop-motion Character AnimationDue Wednesday, November 3rd (This Wednesday)10 points (5 points if late)

    Homework #10 Outline for Second Term PaperDue Wednesday, November 10th (Wednesday of next week)10 points (5 points if late)

    Second Term Paper Science Fact or Cinematic Fiction?Due Wednesday, November 17th 100 points (50 points if late)

    For full schedule, visit course website:ArtPhysics123.pbworks.comPick up a clicker, find the right channel, and enter Student ID

  • Special Guest Animation JudgeThe top three stop-motion character animations (this Wednesdays homework) will be picked by Jason Spencer Galsworthy of Dreamworks Animation (and formerly with Aardman Animation).

  • Homework Assignment #10Outline of your Second Term Paper.Topic: Science Fact or Cinematic Fiction?

    An important component of being a well-educated adult is the ability to distinguish between fact and fiction, between science and make-believe.

    For this assignment,you will choose a single physics principle, such as conservation of energy or the action/reaction principle, and describe three scenes from three different films that incorrectly illustrate that physics law or principle.

  • Homework Assignment #10For example, you can describe how the principle of action/reaction is violated during a fight sequence when one character recoils but without a matching reaction on the other character.

    The three films you selectcan be animated or live-action featuring CGI animation special effects.

    You are strongly encouraged to find three scenes that are as different as possible from each other yet have the same fundamental error in the physics.

  • Homework Assignment #10Post your outline in a blog entry entitled, Outline for the Second Term Paper.

    Outline due by 8am on Wednesday, Nov. 10th10 points (if late, 5 points)

    The term paper itself is due a week later. Length, structure, grading rubric, etc. are similar to the first term paper.

  • Activating your Clicker* Turn on your clicker.* Enter the channel number or letter for joining this class. Hit Enter/Send key.* Clicker should read AP123GF10* Type in your student ID; hit Enter/Send.Clicker is now ready to use; leave it on.Hit any key to wake the clicker from sleep mode.

  • Survey QuestionYou attended the Animation Show of Shows last Friday evening.

    True or False

  • Review QuestionSynchronized standing and sitting by a stadiums crowd is what type of wave?LateralTransverseLongitudinalInvitationalTransvesticalAmplitudeWaveMotion

  • Transverse vs. Longitudinal WavesWave MotionAmplitudeAmplitudeWave MotionBoth types of waves can travel down a Slinkyhttp://www.youtube.com/watch?v=Rbuhdo0AZDUb) Transverse

  • Review QuestionWhen a buzzer is moving towards you the wavelength of the sound gets shorter. The frequency of the sound is a) Higher b) Lower c) UnchangedShorter Wavelength

  • Doppler EffectHigher

    If moving towards you, wavelength shorter and frequency higher.If moving away, wavelength longer and frequency lower.

  • Waves & SoundPart II

  • TalkiesThe first feature film with synchronized sound, 1927sThe Jazz Singer, was made using Vitaphone, a sound-on-disc technology.

    Sound-on-film, however, would soon become the standard for talkiesby the early 1930s.Sound-on-film sound track

  • Silly SymphoniesSilly Symphonies had many imitators, including Warner Bros.s Looney Tunes and Merrie Melodies, as well as MGM's Happy Harmonies. From 1929 to 1939, Disney studios created 75 cartoons in the Silly Symphonies series, starting with The Skeleton Dance. This series dominated the Oscars, winning yearly from 1932 to 1937.The Skeleton Dance (1929)http://www.youtube.com/watch?v=jkhxjzc9uuE

  • South Park: Bigger, Longer & Uncut (1999)Disney (and the rest of the industry) believed that audiences would not sit through a feature-length animated feature with simplistic animation. http://www.youtube.com/watch?v=6UMaTg3lSf4South Park proved him wrong, making over $82 million worldwide, with a $21 million budget.Was it the catchy music?

  • Frequency & PitchThe faster vibrations, have higher frequency. Higher frequencies results in higher pitch for the musical note.Musical notes are sound waves of different frequencies.

  • Standing WavesWhen a wave interferes with its reflection, this may create a standing wave.

  • Fundamental & OvertonesThe Fundamental is the lowest frequency standing wave.The Overtones are twice, three times, etc., the frequency of the Fundamental. 110 Hz (A2)220 Hz (A3)330 Hz (E4)Frequencies of standing waves for a 6 foot long organ pipe

  • OctaveThe note produced by two strings, one half the length of the other, sounded similar.In Western music these two notes are said to be an octave apart.Higher note is twice the frequency of the lower.Sing Some-where over the rainbowMen and women typically sing an octave apart.C5C4

  • Perfect FifthIf the second string is 2/3rd the length then the two notes are said to be a fifth apart.Higher note has 50% higher frequency.

    G4C4Separation between tenor and bass or soprano and alto.Sing Twin-kle, twin-kle little star

  • Strings and PipesShorter the string or the pipe, the higher the frequency of the note thats produced.

  • Brass InstrumentsResonant standing waves produced in a pipe (horn); the set of frequencies (notes) depends on the length of the pipe.Valves used to vary the length through in pipe

  • Woodwind InstrumentsResonant standing waves also produced in a pipe but the pipe length varied by air holes (finger-holes, keys, or pads).FluteClarinetSaxophoneOboeBassoonMeter stickCor anglais

  • Demo: Playing a StrawCan make a simple reed by cutting a straw, as shown, lightly placing it between your lips, and blowing hard.What happens if you shorten the straw (e.g., cut it in half)?

  • Demo: Hoot TubesLarge tube has a metal screen near one end.Heat screen with a flame.Remove tube from the flame and it plays like an organ pipe. The sound created by the larger hoot tube has a larger:A) Frequency; B) Wavelength; C) Amplitude

  • Hoot Tubes, AnalyzedC) Amplitude.Remove the flame and hot air rises from the screen, drawing in cold air.Hot air rising through pipe causes vibration at natural frequency, which depends on the length of the pipe.Amplitude depends on the diameter of the pipe.FLAME

  • Natural FrequenciesMetal baseball bat and wooden bat sound very different when dropped to the floor.Different materials and shapes vibrate at their own natural frequencies.

  • Forced VibrationsVibrating guitar strings force the vibration of the guitars body, producing the sound.553 Hz731 HzCircular rings indicate where the surface vibrates up and down

  • Demo: Tuning Fork & Sound BoxTuning fork by itself is not very loud.Sound is much louder if it is held against a sound box, such as the body of a guitar or any similar rigid surface.The tuning fork forces the surface into oscillation at the same frequency.

  • ResonanceResonance occurs when forced vibrations match an objects natural frequency.Oscillations grow in amplitude due to synchronized transfer of energy into the vibrating object.

  • Acoustic ResonanceIf the amplitude of the sound is sufficiently large, resonant vibrations can shatter a wine glass.

    This may be achieved by exceptionally powerful singers (and by average singers using electronic amplifiers).http://www.youtube.com/watch?v=BE827gwnnk4

  • Tacoma Narrows BridgeIn 1940, the first Tacoma Narrows bridge was destroyed by resonance.First BridgeSecond BridgeWind-forced oscillations that happened to match one of the bridges natural frequencies.

  • Tacoma Narrows BridgeFirst BridgeSecond Bridgehttp://www.youtube.com/watch?v=j-zczJXSxnw

  • Wave SpectrumTo appreciate what it takes to create a realistic animation of water, such as the ocean, its useful to understand the concept of wave spectrum.RealCGI

  • The Abyss (1989)James Camerons The Abyss won an Oscar for Best Visual Effects, thanks to ILMs creation of the first CGI character made of water.

  • The Old Man and the Sea (1999)Aleksandr Petrov, the paint-on-glass animator, creates a realistic ocean with a full spectrum of waves, from major surges to minor ripples.http://www.youtube.com/watch?v=l2_KszEnlq0

  • Spectral DecompositionA complicated wave pattern may be decomposed as a sum of simple waves.

    The graph of intensity (or power) versus frequency is the spectral decomposition.TimeAmplitudeDecomposition into wavesFrequencyIntensity

  • Class Demo: Wave Spectrum

  • Timbre and SpectrumA musical instrument playing a single note produces not just that notes frequency but others as well, mostly overtones.The frequencies produced by a flute playing an A (slightly flat) show that the fundamental (436 Hz) and the harmonic (872 Hz) have almost the same amplitude.

    The spectrum of a tuning fork has (mostly) a single peak at the fundamental.

  • Why Instruments DifferThe unique spectrum of frequencies for a musical instrument gives that instrument a unique signature, which is called the instruments timbre (or quality).Playing this note (196 Hz)

  • Ocean Wave SpectrumHigh FrequencyShort WavelengthLow FrequencyLong WavelengthIntensityHigh WindsLow WindsAs the wind speed increases, the intensity of the large surge waves increases dramatically while the short ripples increases much less.

  • Timber of a MaterialSpectrum of waves will be different for different materials due to density, viscosity, sur