[gameprogrammer] Re: flight simulation camera
- From: "®£$ǖ\"v@M$Ħ ¢© $..........." <theamericansushi@xxxxxxxxx>
- To: gameprogrammer@xxxxxxxxxxxxx
- Date: Mon, 1 Oct 2007 16:20:44 +0530
does any body know how to use blitzbasic
On 10/1/07, richard sabbarton <richard.sabbarton@xxxxxxxxx> wrote:
>
> Hi Julien,
>
> That seems to show that the code is working. It only serves to calculate
> the exact position of the camera. You need to perform a rotation of the
> camera seperately. You should not need to calculate this because you
> already know the rotation of the plane.
>
> Also, as an additional idea, you may want to try something I implemented
> during one of my tests. It gave a greate effect that would be ideal for a
> flight simulator. What I did was detach the camera rotation (Z Axis/tilt
> left/right) from the actual position. Then I place some code to determine
> whether you were turning left or right. If you were turning left then the
> camera would tilt left. The longer you spent turning the further it would
> tilt. I set some max limits on tilt to stop it from rolling completely.
> The best effect was when you were not turning. I put some code in to slowly
> return the Z Rotation of the camera to Zero. If you quickly turn from left
> to right the effect is doubled because you are returning to Zero (no longer
> turning LEFT) and also turning right.
>
> This was a simple piece of code but gave a good feeling of inertia.
>
> Regards
>
> Richard
>
>
> On 01/10/2007, Julien Breton <julienbreton@xxxxxxxxxx> wrote:
> >
> > Hi Richard,
> >
> > When I turrn the plane around the Y axe in global coordinates the plane
> > turns on his Y axe in the same time. Now with your function the camera turns
> > around Y with the plane in the plane coordinates.
> > I have just a little problem because the camera looks always straight
> > (the camera doesn't turn on her Y axe) but I think it's not a big problem.
> >
> > thanks for your help,
> >
> > Julien
> >
> > ------------------------------
> > Date: Fri, 28 Sep 2007 09:59:33 +0100
> > From: richard.sabbarton@xxxxxxxxx
> > To: julienbreton@xxxxxxxxxx; gameprogrammer@xxxxxxxxxxxxx
> > Subject: [gameprogrammer] Re: flight simulation camera
> >
> > Hi Julien,
> >
> > It is assumed that you already know your rotation. This, in your case
> > would be the position/rotation of the plane. So, assume your Plane is at
> > plX,plY,plZ and is rotated by prX, prY, prZ.
> >
> > Your camera position would be behind the plane so plX, plY -
> > CameraDistance, plZ. You would have an offset camera position of
> > 0,CameraDistance,0.
> >
> > So of you had a point class with the RotatePoint() function you could
> > use...
> >
> > CMyPoint CameraOffset;
> >
> > CameraOffset.x = 0;
> > CameraOffset.y = -5; (distance of camera)
> > CameraOffset.z = 0;
> >
> > CameraOffset.RotatePoint(prX,prY,prZ);
> >
> > This would take your camera offset and rotate it around Zero... You can
> > then move your camera to that point which would be
> >
> > CameraOffset.xRotated + plX , CameraOffset.yRotated + plY ,
> > CameraOffset.zRotated + plZ
> >
> > This is the actual position of the camera to place it behind the plan.
> > You then need to rotate the camera at the same angle as your plane using
> > whatever code you are using now.
> >
> > Regards
> >
> > Richard
> >
> > On 28/09/2007, *Julien Breton* <julienbreton@xxxxxxxxxx> wrote:
> >
> >
> > Hello,
> >
> > Thanks for your code,
> >
> > I have a question,
> > When you have calculate xRotated, yRotated and zRotate give you the
> > values to glRotatef function ? (ex : glRotatef (xRotated, 1.0, 0.0, 0.0)),
> > may be I can use gluLookAt?
> >
> > Thanks,
> >
> > Julien.
> >
> > ------------------------------
> > Date: Thu, 27 Sep 2007 11:07:06 +0100
> > From: richard.sabbarton@xxxxxxxxx
> > To: gameprogrammer@xxxxxxxxxxxxx
> > Subject: [gameprogrammer] Re: flight simulation camera
> >
> > Hi There,
> >
> > I had exactly the same problem recently because I was making some
> > calculations in the wrong order. The problem was with the glTranslate and
> > glRotate. I tend to rotate the world around the camera rather than the
> > camera around the world. So I will first do a glTranslate/rotate to move to
> > the point you want to draw your plane. Then do a glPushMatrix() and render
> > the rest of your scene. Once the rest of your scene is drawn then you can
> > do glPopMatrix() and then render the plane. It should always be right where
> > you want it to be.
> >
> > I am just a beginner really. But this is how I would do this. There
> > are probably better ways.
> >
> > The problem I ran into was the start point of ammo when firing. I
> > wanted my bullets to appear to fire from underneath you but, when looking
> > down, they started right in front of you. And when looking up you couldn't
> > see them all. Sounds like a similar issue. The problem is that you know
> > the angle of your plane and you know the distance behind it that you want to
> > move but what you need calculate is the x,y,z of the camera. In the same
> > way I needed to calculate the x,y,z of my ammo start point. I wrote the
> > following code to rotate a 3D point as part of a 3D point class I was
> > working on.
> >
> >
> >
> > // x,y,z are members of a 3D Point Class as are xRotated
> > // yRotated and zRotated. We use the rotated points for
> > // rendering but we leave the original x,y,z unchanged
> > // to avoid any distortion.
> >
> > RotatePoint(int DegAroundX, int DegAroundY, int DegAroundZ){
> >
> > // Define some variables needed to perform the rotation
> > FLOAT oldx,oldy,oldz,newx,newy,newz,alpha; // We need to use FLOAT
> > values for accuracy
> >
> > oldx = x;
> > oldy = y;
> > oldz = z;
> >
> > // ROTATE AROUND Y FIRST;
> > alpha = (FLOAT)DegAroundY / (FLOAT)57.29578; // We have to divide
> > Degrees by 57.29578
> > // to convert to radians
> > newx = cos(alpha)*oldx - sin(alpha)*oldz;
> > newy = oldy;
> > newz = sin(alpha)*oldx + cos(alpha)*oldz;
> >
> > oldx = newx; // After each rotation we have to ensure
> > oldy = newy; // that the new values are pushed into the
> > oldz = newz; // old values because otherwise we will be
> > // rotating partially rotated values.
> >
> > // Then Around X;
> > alpha = (FLOAT)DegAroundX / (FLOAT)57.29578;
> > newz = cos(alpha)*oldz - sin(alpha)*oldy;
> > newy = sin(alpha)*oldz + cos(alpha)*oldy;
> > newx = oldx;
> >
> > oldx = newx;
> > oldy = newy;
> > oldz = newz;
> >
> > // Then Around Z;
> > alpha = (FLOAT)DegAroundZ / (FLOAT)57.29578;
> > newx = cos(alpha)*oldx - sin(alpha)*oldy;
> > newy = sin(alpha)*oldx + cos(alpha)*oldy;
> > newz = oldz;
> >
> > xRotated = newx;
> > yRotated = newy;
> > zRotated = newz;
> >
> > }
> >
> > I apologise for the minimal comments. cos, sin & tan were giving me a
> > headache by the time I was done. I started putting a repository of notes
> > and stuff on my website. You can take a look at it here.
> > http://www.fullonsoftware.co.uk/main.html. I put them in my Snippets
> > section. Lots of my beginners stuff about openGL and C++. Plus some
> > screenshots of my (now stalled) most recent project.
> >
> > Regards
> >
> > Richard
> >
> >
> > On 27/09/2007, *Julien Breton* <julienbreton@xxxxxxxxxx> wrote:
> >
> > Thanks for your answer,
> >
> > My probleme is that my camera don't stay locked to the plane. When I
> > start my exe the camera is behind the plane but when I turn the plane around
> > the Y axe (in global coordinates) the camera moves but don't stay behind the
> > plane. I can always see the plane but on the right (or left) and front at
> > the end but I want stay behind the plane.
> > It's not easy to explain and sorry for my English.
> > I use C++/OpenGL
> >
> > Julien
> >
> > > From: david@xxxxxxxxxxx
> > > To: gameprogrammer@xxxxxxxxxxxxx
> > > Subject: [gameprogrammer] Re: flight simulation camera
> > > Date: Thu, 27 Sep 2007 09:40:31 +0200
> > >
> > > On Thursday 27 September 2007, Julien Breton wrote:
> > > >
> > > > Hello,
> > > >
> > > > Do you know where I can find an example of a flight simulation
> > > > camera ?
> > >
> > > What do you mean, exactly?
> > >
> > > From what I've seen, the basic logic of how the camera works in
> > > simulators (flight, racing etc) is that it's simply locked to the
> > > vehicle, ie it sits where the pilot/driver would be, looking straight
> > > ahead.
> > >
> > > In racing simulators, it's common to add minor adjustments to the
> > > position and view angle of the camera, to hint about the G-forces
> > > that are "lost in transmission". (Lost, unless you're using a moving
> > > platform, that is.) I suppose you could do that in a flight simulator
> > > too, but I can't remember seeing that. X-Plane has a different
> > > solution: Blackout and redout is simulated by fading the view to
> > > black and red respectively. Simple and effective. (Not very not
> > > relevant to racing though, as you'd normally never get that kind of
> > > G-forces on the vertical axis in a car for extended periods of time.)
> > >
> > >
> > > //David Olofson - Programmer, Composer, Open Source Advocate
> > >
> > > .------- http://olofson.net - Games, SDL examples -------.
> > > | http://zeespace.net - 2.5D rendering engine |
> > > | http://audiality.org - Music/audio engine |
> > > | http://eel.olofson.net - Real time scripting |
> > > '-- http://www.reologica.se - Rheology instrumentation --'
> > >
> > > ---------------------
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> > >
> > >
> >
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