Lecture 004

Texture Mapping

Texture Mapping: We first parameterize the surface into UV. In texture mapping, we no longer care about the actual geometry. So that we only associate UV to each pixel in texture.

There are a few ways to create UV:

• planar projection

• cubical projection

• spherical projection

• cylindrical projection

• combined projection

• mesh projection

Texture Lookup

Deals with Interpolation: magnification

• nearest

• bilinear

• bicubic

Deals with texture too small:

• clamp

• repeat

• seamlessly tileable texture

Deals with texture too big: minification

• mipmap (for square texture)

• ripmap (downscale independently in x and y)

• summed area tables (look up table)

Texture Reflectance Properties

We can use map to look up for:

• color, diffuse, specular

• roughness, bump map

• surface normal, displacement map

• environment map

• reflection map

• shadow map

• and more...

People also use all different technologies to capture environment maps:

We can store environment maps as:

• latitude / longitude map

• cube map

• or other parameterization

You can get some maps Here or the originals Here and Here