Distance ignored in ThreeDScene

Hi,

So I'm trying to plot some data in a ThreeDScene, and I am finding that the distance argument is being ignored. So for example, here is a simple class:

```python
class Scene6d_Autometa4(ThreeDScene):
def construct(self):
# Note to keep the coverage looking roughly the same scale as x and y, we are going to
# divide the raw numbers by 100
axes = ThreeDAxes(x_min = -50, x_max = 50, y_min = -50, y_max = 50, z_min = 0, z_max = 70)
circle = Circle()
self.set_camera_orientation(phi=80 * DEGREES,theta=45*DEGREES,distance=12000,gamma=30*DEGREES)
self.play(ShowCreation(circle), ShowCreation(axes))
self.move_camera(phi=30*DEGREES,theta=-45*DEGREES,run_time=3, distance = 200)
self.wait(2)
```

The numbers are a bit extreme because I was trying to see if anything made a difference. Note the axes max/min reflect the data I'm going to plot. Anyway, here is the result of the above:


Note, the distance doesn't change as the camera changes angle, as I expected to happen.

This was run using the official Docker image. I've only just started using manim so I haven't dug that deep into the code. Has distance been implemented?

Thanks,

Jason