| We introduce the term BTF (bidirectional texture function) to represent the appearance of texture as a function of viewing and illumination direction. When a surface is macroscopically rough, appearance has a complex dependence on illumination and viewing direction. We measured the BTF of 61 real-world surfaces by recording images of each surface with 205 different combinations of viewing and illumination directions. A table is provided which gives the illumination and viewing directions associated with each of the 205 images. The images are stored as 24-bit BMP files, and can readily be radiometrically calibrated .
The 205 images for each sample can be downloaded from the directories sample01, sample02, ... sample61, located here.
Any of the 205 images for each sample can be downloaded individually by clicking on the appropriate sample in the graphical sample-list or the text-only sample-list .
An illustration of 3D texture mapping using the images of the database is provided. |