Hi Daniel!
Thank you a lot for your reply. I was focused on generating the bisector to
intersect two lines, but intersecting the actual plane is much simpler. I
made a little function to intersect a plane with a line (partially taken
from this stackoverflow post
<https://stackoverflow.com/questions/5666222/3d-line-plane-intersection>,
so credits to user ideasman42
<https://stackoverflow.com/users/432509/ideasman42>). I am now finishing of
the 'patch' to my code that is supposed to now correctly skip unnecessary
points and create a list with those who's regions we will actually cross.
Code probably tomorrow.
Mario.
On 8 September 2017 at 09:35, Daniel Roßberg <danielmrossb...@gmail.com>
wrote:
> Hi Mario,
>
> In 3D space, rectangular to a vector you have a plane and the vector is a
> normal vector of this plane. In this plane are all vectors which are
> perpendicular to your first vector, i.e. the vectors which products with
> your first vector are 0. This gives you a first equation with two
> variables.
>
> Next, you want to intersect the plane with a ray. I.e., one vector from
> your plan has to be a multiple of the ray which gives you another equation.
>
> However, there should be examples in the BRL-CAD source code for this.
> E.g., the ray-trace of the half primitive is very similar to your problem.
> There, the intersection of a plane, given by a normal vector and a point in
> it, and a ray, given by a start point and a direction, will be computed.
>
> I hope this helps.
>
>
> Regards,
> Daniel
>
>
>
> I'm facing a wall. I need to find a perpendicular vector with the
> condition that it will intersect a third vector.
> Basically, I have the ray and a vector drawn from my current point to the
> previous point.
> I want the perpendicular bisector of that vector to cross my ray, so that
> I can obtain the intersection between the bisector and the ray.
>
> For that I need two things:
> 1) Obtain the perpendicular vector. in 3D there are infinite options, but
> only one will cross the ray. How do I get the one I need?
> 2) Obtain the intersection point.
>
> I browsed through vmath.h but I didn't find anything that could help me.
> Do you know any macro that could be useful here?
> Otherwise I will need to make some of my own for this! If so, any ideas on
> how to approach it?
>
> Mario.
>
>
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