Author  Message 

lmann2
Posts: 156

Posted 15:18 Jun 07, 2015 
I'm very confused about question 11/12 from the final review. I know that if I want to find if two lines are parallel I test to see if there cross product is zero and I know that given p0 and p1 that their direction vector is P0P1 = <x1x0; y1y0; z1z0> which we can use to find the parametric equation, but what vector do I use to test if the two lines are parallel? I think it's the direction vector (because that makes sense), but i'm not sure. 
lmann2
Posts: 156

Posted 15:46 Jun 07, 2015 
In addition, on question 16 are we assuming that w=1? 
lmann2
Posts: 156

Posted 16:11 Jun 07, 2015 
Will you give us the 'hints' section that you give us for question 18 on the exam? 
eykang
Posts: 95

Posted 10:17 Jun 08, 2015 
1. Two lines are parallel if their DOT product is 1. Or their directions are same. 2. On question 16, the points are expressed not in the homogeneous coordinate system. So it means that when we assume they are in the homogeneous coordinate system, w=1. 3. Yes, I will give hint equations. 
lmann2
Posts: 156

Posted 11:38 Jun 08, 2015 

lmann2
Posts: 156

Posted 13:29 Jun 08, 2015 
What set of coordinates/formula do we use to solve 187?? Do we use the points from 1 or 3 or 5 or do we have to find (x*,y*, z*) from formula 3D viewing slide 41??? 
lmann2
Posts: 156

Posted 23:21 Jun 08, 2015 
How do we find the projection of the points/lines on 11 and 12 if we don't know what the near plane (N) is? 