hi, I'm reading the book Mathematics for 3d game programming and computer graphics, and got a doubt in the mentioned section ( page 362 ). It says the distance between a point P ( center of sphere ) and L ( defined as < N, D > ) can be defined as
L*P = r.
Then the book says the relationship can also be written as
N*P + D = r.
Is this correct? Shouldn't it really be N*P - D = r? Thanks
Edited by Demx, 02 September 2013 - 04:00 AM.