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

as a primer thought I'd discuss a bit of
trigonometry as you're probably already
aware there is a triangle
right angle triangle with lengths 1
square root 3 you'll have hypotenuse of
2 and that angles inside the triangle
will be 60 and 30 and going by Toa we
can describe the three trigonometric
identities sine cos and tan also you
have sine theta equals the hook opposite
over hypotenuse which if taking this
angle here 60 would be square root 3
over 2 so if sine 60 equals square root
3 over 2 do the same for cars and 10 so
what does a sine graph actually look
like starting at 0 as a peak comes down
intersects at 180 degrees and comes back
up so that's 180 360 and then it will
continue like that positive and negative
the difference between cars is that it
starts at 1 but it does the exact same
thing
I'm now inside the J monkey Engine SDK
then I got a file we project basic game
going to call this project math
tutorials going to go to source packages
the my game package double-click main
Java this is the automatic file that's
created for us it extends simple
application that has three over rideable
methods simple in its app simple update
and simple render I won't be using
simple render so I'm going to be getting
rid of that simple init app is called
once at the start of the game launch and
simple update runs every frame I'm going
to be clicking f6 and launch our game we
have some display settings we can change
the resolution the bit depth you want
anti-aliasing want to run the game in
full-screen or enable vertical sync
which means that the frames per second
runs at the screen refresh rate click OK
and it will run our game so now we have
a basic blue cube you can move around
with the mouse with the arrow keys you
can strafe forward or backward with WS
and straight left and right with a and B
press escape to close the game down now
going to get rid of the code for the on
the box except for the material drive we
using later you want to understand more
about how that code works I suggest you
read the wiki tutorials and the Jamin
Kinji website i'm now going to show you
how to create a sine curve first of all
I'm going to create a new line I've been
new o for new object tab if you didn't
know that shortcut type line I'm going
to set the start of the line
than the origin I'm going to set the end
of the line to a random vector four five
six now they need to create a new
geometry out of the line mesh let's give
it a name of line and a sign at the line
merge and then I've already created a
new material so I'm just going to assign
the material geometry and then going to
attach it to the ring though so it's
visible on the screen then ctrl shift I
fix all the imports and because there's
more than one line class available I
need to choose the correct one which is
seen shape line click OK f6 to run the
game come to another default settings I
unchecked a vertical sync because there
was some issues with the screen capture
program and it wasn't running
efficiently so now fix that and there's
our line brilliance escape to close that
down I'm now going to show you how to
draw the light the sine curve so if you
remember from the previous lesson sine
curve looks like this it intersects 118
degrees or PI radians
Jamin kinja mainly uses radians we also
have to adopt this so I'm going to be
creating this out of a series of lines
loads of different lines joined together
so I'm going to show you how to do that
to be getting rid of line code so I'm
going to for each line I need to store
the start and the end so I'm going to be
doing this it's going to give that the
origin we need to do the same for the
new back
I'll just also give it the origin for
now and we'll create a form say well X
is less than two times pi use the fast
map class for that so it's also 360
degrees and to increment it and 0.1 then
going to create a new line so get to the
start back
look okay but first of all I need to
change where the vectors are pointing
and what's happened so I'm going to say
that the new height is going to be a
smartphone of X and X is just going to
be left as X and so the new vector X Y
I'm gonna leave that as zero for the
next iteration and then to store the
start vector as the last vector you add
here then if you create a new geometry
after the line you forget that name that
line use the line mesh set the material
off the geometry to the one we've
already defined add it to the root node
and f6 to try see the Lexx brilliant
we don't have to use this sign use a lot
among things I'm going to use x squared
oh yeah
you