Hello All,

When i answered in another thread about moving the camera, in my case a dragon, i unzipped my source and tested back. In fact it doesnt exactly work.

I use the following code:

```
# How far did we move based on the amount of time elapsed?
dt=ClockObject.getGlobalClock().getDt()
distance = dt * self.speed * self.run_factor
climb = dt * self.climbSpeed * self.run_factor
rotation = dt * self.rotationSpeed
# Take a step in the direction of our previous heading.
self.vel=Vec3(Vec3.forward() * distance*-1 +
Vec3.up() * climb +
Vec3.right())
if self.vel != Vec3.zero():
# rotMat is the rotation matrix corresponding to
# our previous heading.
rotMat=Mat3.rotateMatNormaxis(self.avatarNodePath.getH(), Vec3.up())
step=rotMat.xform(self.vel)
self.avatarNodePath.setFluidPos(Point3(self.avatarNodePath.getPos()+step))
self.avatarNodePath.setH(self.avatarNodePath.getH()+rotation)
self.avatarNodePath.setP(self.avatarNodePath.getP()+climb)
```

Basically it is supposed to compute, based on elapsed time since last frame:

- a distance based on constant speed of the dragon ie distance
- an horizontal rotation based on left/right move of the mouse ie rotation
- an vertical climb based on up/down move of the mouse ie climb.

Then orient the dragon in the new direction and make it move forward and

upward/downard in this new forward direction.

However, whatever the signe in the *-1 part of the formula, my dragon is always going backward (meaning it move from the farthesst in screen to the closest in screen).

I dont understand where lie the mistake so any input would be appreciated

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