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Get values omni directional camera in Lua
Posted: Thu Oct 20, 2016 11:06 pm
by emerckx
Hello all,
I'm coding my foot-bot controller in Lua,
and I'm trying to get the readings from the omnidirectional camera of the foot-bot.
I'm able to get the table (= the readings), but I'm unable to iterate over it.
You can view this in the code below.
Code: Select all
function init()
robot.colored_blob_omnidirectional_camera.enable()
end
function step()
-- Here I'm logging the amount of entries in the table
-- This shows the value 1 on the screen
log(#robot.colored_blob_omnidirectional_camera)
-- Here I'm trying to iterate over the entries
-- However this doesn't show anything on the screen
for i = 0, #robot.colored_blob_omnidirectional_camera do
log(i .. " -> " .. robot.colored_blob_omnidirectional_camera[i].value)
end
end
Do you know what I'm doing wrong?
Sincerely yours,
Ewout Merckx
Re: Get values omni directional camera in Lua
Posted: Sat Oct 22, 2016 3:19 pm
by pincy
Hello Ewout,
The fields of each reading of the camera are called
distance,
angle, and
color. You can see this either by CTRL+click on a robot (this shows you the list of variables and their values) or
the actual code that fills this data.
So, your code should be:
Code: Select all
for i = 0, #robot.colored_blob_omnidirectional_camera do
log(i .. " -> " .. robot.colored_blob_omnidirectional_camera[i].distance)
log(i .. " -> " .. robot.colored_blob_omnidirectional_camera[i].angle)
log(i .. " -> " .. robot.colored_blob_omnidirectional_camera[i].color)
end
Cheers,
Carlo
Re: Get values omni directional camera in Lua
Posted: Mon Oct 24, 2016 10:10 pm
by emerckx
Hello Carlo,
Unfortunately, your solution doesn't work for me.
The output still doesn't appear on the screen.
The version of ARGoS that I'm currently using is 3.0.0-beta41.
Might that be the cause?
Sincerely yours,
Ewout Merckx
Re: Get values omni directional camera in Lua
Posted: Mon Oct 24, 2016 10:12 pm
by pincy
Hello Ewout,
I don't know, the camera has always worked well. What exactly is the output that you get? Can you post the entire script and .argos file?
Cheers,
Carlo
Re: Get values omni directional camera in Lua
Posted: Mon Oct 24, 2016 10:55 pm
by emerckx
Hello Carlo,
When copying the example, I noticed that the color value was causing problems.
So it seems partly fixed, however the color still doesn't appear on the screen...
Sincerely yours,
Ewout Merckx
Re: Get values omni directional camera in Lua
Posted: Tue Oct 25, 2016 12:23 am
by pincy
Hello Ewout,
It's because the color is a table itself (the code that fills it is
here). The code should in fact be:
Code: Select all
for i = 1, #robot.colored_blob_omnidirectional_camera do
log(i .. " -> " .. robot.colored_blob_omnidirectional_camera[i].distance)
log(i .. " -> " .. robot.colored_blob_omnidirectional_camera[i].angle)
log(i .. " -> " ..
robot.colored_blob_omnidirectional_camera[i].color.red .. "," ..
robot.colored_blob_omnidirectional_camera[i].color.green .. "," ..
robot.colored_blob_omnidirectional_camera[i].color.blue)
end
Cheers,
Carlo
Re: Get values omni directional camera in Lua
Posted: Tue Oct 25, 2016 10:10 pm
by emerckx
Hello Carlo,
Thank you very much, it works now
However, I had to start with i = 1, because robot.colored_blob_omnidirectional_camera[0] doesn't seem to be defined.
Sincerely yours,
Ewout Merckx
Re: Get values omni directional camera in Lua
Posted: Wed Nov 02, 2016 5:41 pm
by pincy
Hello Ewout,
Great! My bad, in Lua arrays start with 1, not with zero
I fixed the code above!
Cheers,
Carlo