[jME Tutorial 1-9] Reflections in the jMonkeyEngine (Part 2/3) Video Lecture | jMonkeyEngine Math: An Ultimate Guide - Game Development

then I need to think oh you need to
click closing results object the need to
set the way to be collide a bull with
the geometry stourton collision results
object they're going to say if the
collision Muslim size greater than zero
that means that the Ray has collided
with one of the Clyde of objects I'm
going to first of all draw a line from
the atrocious divest from the camera
location I'm going to set it to the
collision results get closest collision
and first appear i think i'll just
create available to score this I might
use it more than once oops collision
back to 3f oh I what's wrong
collision result 12 k which will result
controller time and then its closest get
collision point your contact points so
this is going to draw a line from the
camera directly to where the Ray
intersects after I fresh key on the
keyboard then go to create geometry out
of this line
substitute neat little tree the name of
line with a line mesh will to creating
in the tail today's sex miniature common
but they're just going to use the
unshaded material definition again click
and then from this line
okay probably i imported the wrong line
which I did I don't want math line I
want seen shape control shift I so I did
that wrong okay that should work for him
I'm going to attach the material to the
geometry touch to the rig move to make
it visible okay Oh shift F does to form
a a little bit shift f6 let's see if
it's about but ok I'm going to face it a
little press G and error unsupported
collision exception what ie maybe it
leads to BG and rain or too sure try it
that way g ok so i did it wrong but yeah
as you can see created a line from where
i press G move away to the collision
point I'm now going to change the color
of the lines you can actually see it and
now like to make it easier i'm going to
put a plus in the middle of the screen
so you can actually see where you're
pointing i believe there is a pilot
script for this just going to take over
the HUD text from the palette in the
interface section you get rid of this I
don't need that control shift I to
import bitmap text I'm going to k-keep
the size the same i'm going to change
this text 28 plus 2x to cross a i'm
going to set the location of this to be
could use the settings variable to get
the width I need to minus the the width
of the plus sign because in jme ok don't
have my other program running so I can't
draw on the screen but let me just get
rid of this snow
so it's local translation be at 0-0
press ok as you can see you can't see it
on the screen and it is because this
nope no mind is because it is located at
the very bottom left
out of the way of both the why and the
x-axis so if I move it anywhere along
the Y I won't see it in anywhere along
the X I won't see it either I need to
move it both up and right but if I just
use settings get with I would divide it
by 2 this won't Center it exactly you'll
be off by a little bit and it's so to
correct it I need to- get line with and
then need to times that by ahead to
position it correctly I'm then going to
do the same the y-axis settings dots
gets right it turns up by a half when
this case i need to add the line height
our textbook times now we try to draw it
to explain it a bit better but I don't
have my program turned on so I cannot do
that on the braid and actually i will
get rid of the other techs in case gets
in the way touch I'm choking I could
have used that actually I'll probably
should do it the better way now using
the new constructor arguments for the
super subs clinical suprem just going to
give it no uh no actually I need the fly
cam app space on your saintly flood app
state patrol shift I so now I'm only
going to get the app state i'm not going
to get the debug keys i'm not going to
get the the frames per second text all
the other frame buffer text not forgot
what that's called to my control shift
06 hopefully i should have a white you
have a white cross hair directly in the
center of the screen
change the color of it so you have do
this hello text I need to get the
material so i think i need to cast hello
text to a geometry so i can get the
material object from no that's not going
to let and whatnot control shift beyond
this extends load okay so i'm going to
say take a wild guess here you go to get
child 0 which I assume contains the
geometry going to cast that to a
geometry I'm going to get the material
world that you're going to set the color
to be say going shifter six to make sure
it actually works awesome let's try and
make it a bit bigger get rendered sighs
its clubs that 13 it might be a bit
fuzzy but it's a lot bigger now okay so
change the line color change that
college we should get the see it now ok
so back to why we actually are doing
this tutorial and that is to find the
direction of the reflected vector so
first of all i'm going to create a new
arrow which I'll use to depict the
direction of the reflective vector
I ll show shift i drop space i'm going
to fit to face this in the z direction
and I put a multi-country to you create
a new geometry out of the error is to do
geometry call it arrow by the arrow mesh
creating material side of the asset
manager got excused and shake it again
pindy push the material to the joint
raid and then I need to touch it to the
loot load told you to ok so now that the
fam tweeted about and then going to
create the court an ian from the axis of
where the Ray intersects the quad
critical turning
I'm going to
but i first need to know the angle at
which ok have I turned on the new
program now so i can draw to the screen
so if you remember drawing the XY axis
if i have a normal here to have a
reflection i'm going to face it the
other way for now may five a direction
and then i need to find this angle here
so that i can use that angle rotate
tinental quaternion and then rotate that
vector by that quaternion amount it will
give me the reflected direction doing it
like that ok so ok no but it would
actually rotate the normal vector like
that ok so let's get rid of that so when
need to find the axis now going to use
the cross product for that vector to
excellence I need the normal so we'll
save it with me the normal vector going
to equal closest collision get contacts
normal