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winstonc

Two intersections to the sphere.

chenruis

If the reverse direction of the ray pierces the sphere,then maybe t need to be clamped?

xinyangc

Two or one intersections

weitingt

two intersections

notme

Because the ray can have at most two intersections with the sphere. If the solutions are the same we know they are tangent and if they have imaginary parts we know that the ray misses.

jesshuifeng

we have 1 or 2 intersections

linyingy

Two solutions mean two possible intersections.

PsychotiK

two intersections

lights

It makes sense that in a sphere there will be two intersections but what about in the case of shapes that have a hole in it like a torus? Would we then have 4 intersections for the ray?

notme

The reason why we get two intersections is because we use the equation for a sphere. For a torus that equation would be different and I think that's how we would get more results.

stroucki

In and out. Difficult to remember now after the lecture why f(x) = |x|^2 -1 is a function describing a unit sphere.

verylostpenguin

We have one or two intersections

haotingl

two intersections

idkLinearAlgebra

2 intersections

froggystyle

there are two solutions since there can be 2 different intersections

alexz2

there are two intersections

aabedon

2 intersections