Re: objects only appear as black silhouettes

The problem almost certainly is that you need to update your graphics driver.

Bruce Sherwood

On Mon, Nov 29, 2010 at 7:58 PM, Vijay Somers <[email protected]> wrote:
> Hi,
> I'm just trying to run the following simple bouncing ball example from the
> vpython site:
>
> from visual import *
>
> floor = box (pos=(0,0,0), length=4, height=0.5, width=4, color=color.blue)
> ball = sphere (pos=(0,4,0), radius=1, color=color.red)
> ball.velocity = vector(0,-1,0)
> dt = 0.01
>
> while 1:
>     rate (100)
>     ball.pos = ball.pos + ball.velocity*dt
>     if ball.y < ball.radius:
>         ball.velocity.y = abs(ball.velocity.y)
>     else:
>         ball.velocity.y = ball.velocity.y - 9.8*dt
>
> It runs without errors, but the floor and ball objects are black, without
> any visible surface detail.  The silhouettes of the objects are visible if I
> change the background colour to something other than black, but changes to
> the colour of the objects don't affect anything.  I'm running this on a
> fresh install of Ubuntu 10.04, python 2.6.6, and it says I have version
> 1:5.12-1.1 of vpython.
>
> Any help would be appreciated,
> Thanks,
> Vijay
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>

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