On Mar 16, 2007, at 4:17 AM, Douglas S. Blank wrote:
Yes, that text is more confusing than helpful. Here, "hit" is
suggestive
of the ray that extends from the range sensor and then intersects
with an
object in the world. So, the (x,y,z) tuple is the location (in local
coordinates) where the sensor detected an object.
So what do local coordinates refer to? Is this wrt some "central
spot" inside the robot?
I've read about the geometry stuff, in conjunction with your hits
explanation, but I'm still very confused on how to proceed.
The reason I am asking these questions is that I'd like to be able to
write a method to ask if three adjacent position sensors are looking
at something that lies in the same plane (actually, along the same
line, since I'm using the 2d world). I'm currently doing some hacks
using sensor angles and distances, but that stuff isn't working the
way I'd expect. Then I started to think perhaps all this stuff is
already embedded (and debugged :-) in a local coordinates viewpoint,
which led me to wonder if each sensor shares the same underlying
local reference or not, and how to use this info to extract what I want.
FWIW, I've looked at, say robot.range[2].hit and robot.range
[2].geometry and there is exactly one element in these two tuples
that appear to have identical values (0.0299...).
_______________________________________________
Pyro-users mailing list
[email protected]
http://emergent.brynmawr.edu/mailman/listinfo/pyro-users
