# HG changeset patch # User alfonse # Date 1298237510 28800 # Node ID b053f84d9f668ceaf02b4a25d298059c3833b59c # Parent 48be009d157f3601f829e88f5c6e042c56a4e3a6 Rewrote the preface, and expanded on the texturing section. diff --git a/Documents/Basics/Tutorial 00.xml b/Documents/Basics/Tutorial 00.xml --- a/Documents/Basics/Tutorial 00.xml +++ b/Documents/Basics/Tutorial 00.xml @@ -249,10 +249,25 @@ math operations will be introduced and explained as needed when they are first used. And unlike the math operations introduced here, most of them are not component-wise operations. + + Range Notation + This book will frequently use standard notation to specify that a value must be + within a certain range. + + If a value is constrained between 0 and 1, and it may actually have the values 0 and + 1, then it is said to be on the range [0, 1]. The square brackets mean + that the range includes the value next to it. + If a value is constrained between 0 and 1, but it may not actually have a value of 0, + then it is said to be on the range (0, 1]. The parenthesis means that the range does not + include that value. + If a value is constrained to 0 or any number greater than zero, then the infinity + notation will be used. This range is represented by [0, ∞). Note that infinity can never + be reached, so it is always exclusive. A constraint to any number less than zero, but + not including zero would be on the range (-∞, 0).