Simple Animation

• This is by no means an ultimate solution, but it will do for now.
• glutTimerFunc(int delay, void (* func)(int value) callback, int parameter)
  • delay is the milliseconds until the call is made
    • This is a lower bound
    • Depending on code, it might be called MUCH later.
  • callaback is the callback function
    • The function signature indicates a void with a single integer parameter.
    • If NULL no function is registered
  • parameter is the parameter that is passed
    • By value
• note the use in MovementFunction
• Note the change in resize()
  • glFrustum(left, right, bottom, top, near, far)
  • This a perspective projection (glOrtho did a parllel projection)
  • the parameters define a viewing frustum, which has an apex at (0,0,0)
• Glut gives us a bunch of predefined objects
  • glut SHAPE Object
  • SHAPE = {Solid, Wire}
  • OBJECT = { Sphere, Cube, Cone, Torus, Dodecahedron, Octahedron, Tetahedron, Icosahedron, Teapot}
  • glutWireTeapot(1), glutSolidCube(4)
  • Look Here for more information.
  • Freeglut apparently adds Teaspoon, Teacup, SierpinskiSponge
• Two of the matrix stacks
  • Objects The Modelview matrix is applied to objects
  • Then the PROJECTION matrix is applied.
  • Color Matricies, Texture Matricies
  • These are stacks of matricies
  • As transformations are applied they add to the top matrix on the stack.
  • glMatrixMode sets the current matmrix we are manipulating
  • glLoadIdentity(); sets the current matrix to the identity
  • glTranslatef(x,y,z) applys a translation matrix to the stack
  • glRotatef(angle, x,y,z) rotates aglong a given vector
  • glScale(x,y,z) scales by a given amount
  • glPushMatrix() - save the current matrix on the stack
  • glPopMatrix() - Go back to the previous matrix.
  • Much more on this later too.