Texture

Question 1

Texture element

Answer 1

‘Texel’, a unit of texture space that represents overall texture.
E.g. a texel can be a pebble of a pebble beach, or a bubble of a bubble bath.

Question 2

Texture density

Answer 2

The amount of texture per unit area.

Question 3

Slant

Answer 3

The degree to which a surface slopes.

Question 4

How texture density changes across an image is inherently related to…

Answer 4

Surface slant.

Question 5

What is the concept of perspective projection (pinhole camera)?

Answer 5

• That our vision is a highly sophisticated version of a pinhole camera.
• That size is not preserved in perspective projection.

Question 6

Texture density gradient

Answer 6

The gradual change in texture density across an IMAGE.

Question 7

Homogeneity constraint

Answer 7

Therefore, a SLANTED SURFACE with a homogeneous texture will appear as an IMAGE with changing texture density.

Question 8

Surface orientation

Answer 8

The degree to which a surface slants and tilts.

The umbrella analogy drawing.

Question 9

Degrees of freedom

Answer 9

Used to express slant and tilt values, and to emphasise that they can vary independently of each other.