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Any Math wiz here?

S

SONYFX

Senior member
How do you find the outward normal of the triangle on each edge?

I know that if the edge has equation Ax+By+C = 0, than the normal to the edge is just (A, B)

But how can I determine if it's pointing outward or inward??
 
Originally posted by: SONYFX
The dot product on the book always looks like this

But what if i have two different vectors starting at different location, can I still use the dot product?
Click to expand...

Well, whenver you do dot product you are always given two sets of coordinate. In order to have them starting at different location you'd need (at least) 3 sets of coordinates, which I you can't do dot product w/. Hence the convention that we assume all vectors start from origin (for most of the problems)

--GiLtY
 
thedot product of two vectors is a quantity with the value = product of 2 vectors' lengths and cos(angle). so, think of it, when you have two vectors creating a different angle than the one in your picture, just change the value of the angle in the cos(angle). so yes, you can use it as long as you know the value of the angle and the lengths of the vectors
 
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