Re: [Plib-users] Newbe Question

[Dave M. <dp...@ef...>]

I got started with PLIB by looking at
plib/examples/src/ssg/tux/tux_example.cxx ; the function of interest is
sgSetCoord()...

void sgSetCoord ( sgCoord *dst, const SGfloat x, const SGfloat y, const
SGfloat z,
  const SGfloat h, const SGfloat p, const SGfloat r ) ;

This is used in tux_example.cxx like this

  sgSetCoord ( & campos, 0.0f, -5.0f, 1.0f, 25.0 * sin(frameno/100.0), 0.0f,
0.0f ) ;
  ssgSetCamera ( & campos ) ;

Playing around with this, you should be able to implement your flying code.
You can also look at the viewer example which lets you zoom and orbit a
fixed point.  You can also use quats or build matrices yourself...

http://web2.airmail.net/sjbaker1/matrices_can_be_your_friends.html

Manipulating direction vectors and quats have some advantages you'll
appreciate later like interpolation and immunity to gymbol lock.  Camera
systems can get very sophisticated and complicated, especially in collision
avoidance, but that should get you going.

--Dave McClurg

----- Original Message -----
From: Red <red...@ya...>
To: <pli...@li...>
Sent: Saturday, September 29, 2001 9:58 PM
Subject: Re: [Plib-users] Newbe Question


What I was wondering was, how do you deal with roll,
pitch, and heading? I know for a walk through you have
something like:
file://turn right
heading -= 1.0f;
yrot = heading;

file://turn left
heading += 1.0f;
yrot = heading;

file://move foward
xpos -=sin(heading*piover180);
zpos -=cos(heading*piover180);

then:
rotate everything
translate everything
draw to screen

I have no idea how to get from this to some basic
flying code. I expiramented with some ideas, tried to
come up with what the math might look like, but
nothing works. So if someone could point me in the
right direction, that would be great.