I just write this thread because there still have questions about dot and cross products here, and I remeber that I wrote some other threads about them (links at the end).
Some reminders about differences between cross product and dot product.
The first one is important, the cross product creates a vector, the dot product creates a number !
Graphically, the dot can be represented like this :
The same way for the cross :
The problem about the cross product with PC-DMIS, is that the result is always a unit vector (the result is divided by its own length).
So you can't use it directly to calculate angles or distances.
mbatten : I'm sorry, I'm not sure to understand the first question... If you want an accurate result, you have to use the max decimal places.
If you calculate a lonfg vector with only 3 decimal places, I'm not sure that the result is good (I will check it, asap )
For the second, I remember now, it has been "reported" long time before I registered on the forum. As usual, the answer was : " it works as it's concepted"...
mbatten : I'm sorry, I'm not sure to understand the first question... If you want an accurate result, you have to use the max decimal places.
If you calculate a lonfg vector with only 3 decimal places, I'm not sure that the result is good (I will check it, asap )
For the second, I remember now, it has been "reported" long time before I registered on the forum. As usual, the answer was : " it works as it's concepted"...
There's a somewhat messy formula to compute the cross product using the X, Y, and Z coordinates of each vector. I was just wondering if it would give a more accurate result in some situations.
If you want an accurate result, you have to use the max decimal places.
)
