Re: opengl camera troubles

[Chris Dillman <chrisd at plaidworld dot com>]

> Hello everyone, I'm back with more OpenGL problems.
> I will explain the problem, and then give the code.
>
> The Problem: I have a camera class, and if I move the camera back some so
> I can see stuff, it doesn't behave as expected. With camera.z at -10,
> "camera.yaw 0.5 "and "cube_in_the_middle.yaw 0.5" produce the exact same
> result; the cube spins. With cube.yaw, the cube should spin. With
> camera.yaw, the cube should seem to move back and forth, because the
> camera is changing direction, correct?
>
> I'm sure my yaw-pitch-roll code is correct. I tested it visually against
> rb3d before I started working on a camera.
>
> The Code (mContext as glContext is a property):
>
>   mContext.use
>   call mContext.update
>   glClear(GL_COLOR_BUFFER_BIT + GL_DEPTH_BUFFER_BIT)
>
>   glMatrixMode(GL_PROJECTION)
>   glLoadIdentity
>   gluPerspective(45, me.width / me.height, 0.1, 1000)
>
>   glTranslated(camera.position.x, camera.position.y, camera.position.z)
>   glMultMatrixd(camera.orientation.createMatrix)
>
>   glMatrixMode(GL_MODELVIEW)
>   glLoadIdentity
>
>   //draw stuff
>
>   glFlush
For better game speed REMOVE glFlush


>   mContext.swapBuffers
>
> Please keep in mind that this is not _exactly_ how I do things. This code
> is spread over several functions in real life.
>
> Why is it doing this?
> I also have camera.moveForward that is not working correctly.
>
>  Sub MoveForward(Distance As Double)
>    dim forward as vector3D
>    forward = me.orientation.transform(kVecForward)
>    me.position.add(forward.times(distance))
> End Sub
>
> This behaves exactly like "camera.position.z = camera.position.z +
> distance", instead of transforming the forward vector by
> camera.orientation like it should.
>
> What's going on???
>
> Asher
>
>
>
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--
Email: chrisd at plaidworld dot com
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