Lighting and Shading - Inspiring Innovation · Lighting and Shading • Phong illumination model...

C O M P U T E R G R A P H I C S

CMSC 435 / 634 August 2013 lighting and shading

Lighting and Shading

Motivations Approximate physical reality

Radiosity: Restaurant interior: Guillermo Leal, Evolution visual

Lighting and Shading

• Phong illumination model (this lecture) – Approximate only interaction light, surface,

viewer – Relatively fast (online), supported in

OpenGL

• Ray tracing (later this semester) – Follow light rays through a scene – Accurate, but expensive (off-line)

• Radiosity (advance CG) – Calculate surface inter-reflection

approximately – Accurate, especially interiors, but expensive

(off-line)

Raytracing example

Martin Moeck, Siemens Lighting

Shading • Variation in observed color across an

object – Strong affected by lighting – Present even for homogeneous

material • Caused by how a material reflects

lights – Geometry – Light source, locations, and

properties – Material properties

Shading for Computer Graphics

• Need to compute shading – Of particular geometry – Under particular illumination – From a particular viewpoint

• Basic question: how much light reflects from an object toward the viewer?

Simple materials

Smooth surfaces of pure materials have ideal specular reflection Reflectance (fraction of light reflected) depends on angle)

Classic reflection behavior

Adding microgeometry

Lighting and Shading - Inspiring Innovation · Lighting and Shading • Phong illumination model...

Documents

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