Welcome for computer graphics.

And let me start with a short hint

about a program that might be interesting for you,

because you are bachelor students, typically

in a semester, for which this might be interesting.

So we have funding.

We means the computer science department

have funding for sending students to Brazil.

So if you think that might be interesting to go there

this year, then this might be an option.

So one important thing this day will end before the World Cup.

So you might prolong then and try

to stay there for the World Cup.

But otherwise, in fact, even the dates for the lectures

have been moved four weeks in advance to have no overlap,

to avoid overlap, probably because they

need rooms for other things.

But nevertheless, so we are able to send

three students between February and June this year

or next year to Brazil.

And students get funding, so accommodation and flight

and health insurance and so on can be covered.

And it's for computer science or medical science students

in the bachelor or master level.

And you need some, at least a grade of 2.5 and at least 90

ECTS points.

And yeah, you don't need to have skills in Portuguese or so.

But if you do, then this would be an advantage, of course.

OK, so that's just a brief remark.

If you're interested in that, just contact me

and I can tell you where you can apply

or whatever other information and so on is needed.

OK.

OK.

Mm-hm.

Mm-hm.

Mm-hm.

This is the one.

Well, OK.

So yeah.

Good.

So what are we speaking about right now?

So we are still in the chapter of ray tracing.

And we started last week by speaking about intersection

tests between rays and objects.

And objects, so we started with looking at simple primitives.

I told you about intersecting a ray with a plane,

with a sphere, and with a box.

And that's what we all did last time.

But yeah, now the probably most important primitive