Point-Light-Displays

1
Hi everybody!

I'm a graduate student working on the perception of
point-light-walkers in the workgroup of Niko Troje (University of
Bochum, Germany). We are currently running our experiments on a
Linux-machine, because we can time the displays according to the
vertical sync of the screen, but we would like to do it under Matlab.
We have some routines to display the walkers as a timeline of
3D-coordinates of the point-lights, using the plot3-function in a
figure window. Is there any function in the PP-Toolbox for Windows we
could use for these displays and to make sure that a single posture of
a walker is displayed every single frame?

Greetings,
Cord Westhoff
2
Cord

You certainly can do this, but it will take some effort. You will need
to do a transformation from 3D to 2D, something which the plot3
function does for you.

If you can figure out how to do that (not too diificult actually,
provided you don't need interesting things like shading) then you can
simply display the 2D image in the standard way using the
SCREEN

command. To make sure your displays are fast enough, make sure to use
offscreen buffers (type SCREEN('openOffscreenWindow?') and the RUSH
command.

Daniel Goldenholz

--- In psychtoolbox@yahoogroups.com, "cord_westhoff"
<cord.westhoff@g...> wrote:
> Hi everybody!
>
> I'm a graduate student working on the perception of
> point-light-walkers in the workgroup of Niko Troje (University of
> Bochum, Germany). We are currently running our experiments on a
> Linux-machine, because we can time the displays according to the
> vertical sync of the screen, but we would like to do it under Matlab.
> We have some routines to display the walkers as a timeline of
> 3D-coordinates of the point-lights, using the plot3-function in a
> figure window. Is there any function in the PP-Toolbox for Windows we
> could use for these displays and to make sure that a single posture of
> a walker is displayed every single frame?
>
> Greetings,
> Cord Westhoff