Introduction

• What we want:

  Given a point on a surface visible to the viewer through a pixel, what colour should we assign to the pixel?

• We want to smoothly shade objects in scene
• We want shading to be done quickly so that we can achieve real time
• Begin with creating a simple lighting model at a single point on a surface
• Later, we will extend to shade polygons
• Still later, we will improve lighting model (requiring more computation)

• Initial Assumptions:
  • Linearity of reflection:
    

    

  • Full spectrum of light can be represented by three floats (Red,Green,Blue)

Readings: Red book, 14.1; White book, 16.1.