ENGRI 1620 Lecture Notes - Lecture 13: Linear Interpolation

• School: Cornell University
• Department: Engineering Introduction
• Course: ENGRI 1620
• Professor: Donald Greenberg

Document Summary

Steps in modeling: perspective transformation, raster operations, image storage. Goal of creating graphics: the model should be indistinguishable from the real object. Direct lighting: light is not occluded, lights are point source, no interreflections from other surfaces. Raster operations: convert polygons to pixels, compare z values to determine occlusion, incremental shading. Uses linear interpolation to mix colors between two known points on scan lines. Diffuse vs specular: diffuse objects reflect light in all directions and absorb more light than specular objects, specular objects reflect light in a direction dependent on the angle of incidence. Viewers observe different reflections depending on their viewing position.