[jME Tutorial 1-8] Rays with the jMonkeyEngine Video Lecture | jMonkeyEngine Math: An Ultimate Guide - Game Development

array can be envisaged as a continuous
line which starts out at a point and
then just continues in a certain
direction it's basically what array is
and they useful for line-of-sight
calculations if I have a character it's
looking this way I can point a ray from
his direction to see if this Ray
intersects anything along the way such
as calculating if he sees an enemy or
this is an object of interest or any
other use you can find for rays they're
going to create a new file control n put
my test template and call this Ray's
going to create geometry variable I'm
going to later use this in the simple
updates or want it to be class-wide and
i'm going to create a sphere control to
try to fix the imports control space to
find the construct arguments said
samples samples will be said the radius
ok look I'm just going to say no 10 10
and radius of too much will that be too
big but we'll find out soon enough
create my drama club games get the name
of sphere by the sphere mesh to it
cementerio touch it to the road
just like we've done so many times
before shift that sex
okay let me just ink on crease it is the
15 also I've changed the resolutions in
the last time by accident and take
vertical sync okay there's our sphere
now going to create an arrow which will
point in the direction of the normal of
the triangle which the Ray intersects
you create a new triangle I knew out
parasite atrocious die you're going to
apply unit said mutation or direction
make it two units long we're going to
set the line rate to three then going to
click another victory for the smart I'm
going to apply the arrow mesh to this
new drama train you will make a new
material for basically I'm going to be
changing the color and the material
assets manager confused unshaded again
and to set the color of this to read now
use green boilers and fly the material
to the hour yep okay in our simple
update and to create a new ray look very
patrol shift I'd fix the impulse control
space I'm going to use the camera origin
so I'm going to be facing the reign of
direction of the camera is looking to
camp aesthetic not get vacations I
application and then can get direction
if you remember from our camera
tutorials you should know all about this
and then go to create a collision
results objects so doesn't won't use any
during winter project I and then going
to make this sphere Collider ball with
the Ray store it in the results object
and what to say if there is a collision
between this useless on stops sighs it's
greater than 0 and then going to get the
closest collision results with a closed
fist doesn't get closest collisions if
you remember array just continues in its
direction then it will pass through
anything so I want the first and it
collides with die
or then set our arrow to that location
it's a living translation use the
closest you've kept contact point then
going to create a quaternion to rotate
the arrow depending on what the
direction of the normal is for turning
die i'm going to use to look at
method twins advanced will just get
normal
no not those closest get long closest
point look what is happening get contact
no more about it vector up this vector
reply and then going to set the rotation
take you and then going to add the arrow
to a bit node but then if there is no
there is no ray intersection all go to
know my pic shift f6 to run it click OK
as you can see
we're getting an arrow pointing in a
direction of the normal face away is no
error but long it's changing its
direction okay there's a primer on raise
I'm going to continue raise the next two
tutorials show you how they are also
more useful