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tendifo

ray sphere intersection

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I've found a nice resource of how to find where a ray and sphere intersect. http://www.csee.umbc.edu/~olano/435f02/ray-sphere.html However, I just want to clear up some stuff. How would I go about multiplying two points together? How do I multiply a vector and a point together? Does all of it just use the same math as a dot product? Thanks.

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Quote:
Original post by tendifo
I've found a nice resource of how to find where a ray and sphere intersect.

http://www.csee.umbc.edu/~olano/435f02/ray-sphere.html

However, I just want to clear up some stuff.

How would I go about multiplying two points together? How do I multiply a vector and a point together?

Does all of it just use the same math as a dot product?
The vector products in the example you linked to are all inner (dot) products.

Does that answer your question?

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They gave this as the final set up:

a = d * d
b = 2d * (p0 - pc)
c = (p0 - pc) * (p0 - pc) * r * r

So... let's say p0 - pc = m.

m * m being a point times a point = mx * mx + my * my + mz * mz

That correct?

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Quote:
Original post by tendifo
m * m being a point times a point = mx * mx + my * my + mz * mz

That correct?
It's actually a vector times a vector, but otherwise yes, that's correct.

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