Computer Science 112
The Art & Science of Computer Graphics

Spring 2016, The College of Saint Rose

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Utah Teapot at the St. Louis Science Center, July 2012.

Agenda

• Announcements
  • Be sure to wrap up Studio/Lab 3: Names and Groups soon if you haven't already done so
  • Office hours this afternoon might move to this room, SC 469A
• Lecture 7 assignment recap
• In-class Exercise 8 - (10 lecture assignment points) due before the end of class.

  Several of you have built models of houses or other buildings in some of your early work. In many cases, those were built of a cube with a cone on top. Let's see about getting a more standard "peaked roof" object that could be used in such a circumstance.

  

  The view above is from a camera position of (200, 200, -300). The roof's base is 100 ×100, the height of the peak is 50, and the base of the roof sits atop the xz-plane.

  Using a Difference or an Intersection (either can work), create this in an object named roof.

  Please demonstrate your program or submit only the file Roof.py by email before you leave class. Email submissions should use a meaningful subject line, clearly indicating the course number and assignment name.

• Custom objects in Ambrosia
  • Mesh objects
• Studio/Lab 4: Working with Custom Objects out

Lecture 8 Assignment

Due at the start of class, Wednesday, February 17.

Please submit answers to these questions either as a hard copy (typeset or handwritten are OK) or by email to terescoj AT strose.edu by the start of class. Please use a clear subject line when submitting by email (e.g., CSC 112 Lecture 8 Assignment, Mary Smith). We will discuss these questions at the start of class, so no late submissions are accepted.

1. (6 points) As a start to review for the first exam (still about a month away), draw the view from the standard camera position of the objects below on these axes. Each "graph paper" square represents a 25 ×25 region of space.
   

   scene.add(cube, scale(.5)*translate(100,0,0), yellowPlaster)
   scene.add(cube, translate(100,0,0)*scale(.5), cyanPlaster)
   

   Note: a printable PDF copy of the blank axes is here.

2. For a bit more practice with constructive solid geometry, create a three-dimensional Pac Man object, with his mouth open. You need not run this in Python/Ambrosia or generate an image, but you may do so if you wish. (6 points):
   
3. Write (or type) out an Ambrosia definition for the same roof object as the in-class exercise, but this time constructed as a Mesh object. (8 points)

Terminology

• mesh
• polygon
• co-planar

Examples

• On the Wiki: MeshCube, Downloadable file: MeshCube.py
• On the Wiki: Pyramid, Downloadable file: Pyramid.py
• On the Wiki: PredefinedMeshes, Downloadable file: PredefinedMeshes.py

Links

• Utah Teapot
• The Teapot in Toy Story and The Simpsons
• Stanford Bunny
• Stanford Dragon