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seen Dec 12 '12 at 13:58

Dec
11
comment calculating points in specific distance from given point & direction
if taking the orthogonal vector to $(x_1,y_1,z_1)$, which is "on" the disk. now transforming to $(R,phi,theta)$, taking R as big/small as i need with same angles, will it suffice? if not, what else do i need to do?
Dec
11
comment calculating points in specific distance from given point & direction
i understand the first formula, aobut the distance, and also the second one, since they're both orthogonal to each other the product must be zero. but how its a quadratic equation? i have two equations with three variables unknown at each one: $x_e,y_e,z_e$. obviously, guessing one of them wont always work, only if i hit a lucky value within the range of the parameters. so how can i get one specific point with the two equations?
Dec
10
asked calculating points in specific distance from given point & direction