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I am working through the following equation in the plane-line intersection point. But the question is smaller than this. I am confused about v, the direction vector:

t = - (dot(n,p) + d) / dot (n, v)

I know one contributing equation is:

p = po + t * v

I know that v represents the direction vector. What do I calculate v from : 2 different points on the plane? position vectors on the planes? other?

I am working through the following equation in the plane-line intersection point. But the question is smaller than this. I am confused about v, the direction vector:

t = - (dot(n,p) + d) / dot (n, v)
v)

p = po + t * v
v