# What's the meaning of 0 to 1 space in UV?

I would like to know why many instructor talk about 0 to 1 space in UV mapping or related areas of UV unwrapping.

Are 0 to 1 values part of a Boolean, or some programming stuff?

It is actually a coordinate system in percentage of image size.

A coordinate [0,0] corresponds the lower left corner, and [1,1] is the upper right corner (depending the the render engine/software.

It is made in such way that unwrapping is actually image size independent, so that if at a later time, you decide to use a larger image or an image with different dimensions the UV map still works and adapts (with distortions) to the new image format.

It is not a Boolean value nor is it limited to the 0~1 range, it is a float and can take on any value like -3.2, or 158.56.

The image will tile infinitely in X and Y axis repeating at every 1 unit, so for values bellow 0 or above 1 it will tile the image so that coordinate [2,2] will show the same part of the image as [1,1].

• Per image? for example every single Uv space has this limitation , is like an array? or bidimentional ? ok... I think is not complicated and that is a concept , any trick or consideration about to know? – Reifus Rufus Nov 7 '16 at 3:13
• Yes, its a percentage per image, but it is not limited to 0-1, it is a float value, and can take on values larger 1, i will simply repeat the image infinitely. Edited and detailed answer above. – Duarte Farrajota Ramos Nov 7 '16 at 3:29
• ok , I think is not more to tell , for cg artist is more than enough to take this few concepts. thanks – Reifus Rufus Nov 7 '16 at 3:32