Created
January 17, 2019 09:05
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Lidar velodyne Vrep
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function sysCall_init() | |
visionSensorHandles={} | |
for i=1,4,1 do | |
visionSensorHandles[i]=sim.getObjectHandle('velodyneVPL_16_sensor'..i) | |
end | |
ptCloudHandle=sim.getObjectHandle('velodyneVPL_16_ptCloud') | |
frequency=5 -- 5 Hz | |
options=2+8 -- bit0 (1)=do not display points, bit1 (2)=display only current points, bit2 (4)=returned data is polar (otherwise Cartesian), bit3 (8)=displayed points are emissive | |
pointSize=2 | |
coloring_closeAndFarDistance={1,4} | |
displayScaling=0.999 -- so that points do not appear to disappear in objects | |
h=simVision.createVelodyneVPL16(visionSensorHandles,frequency,options,pointSize,coloring_closeAndFarDistance,displayScaling,ptCloudHandle) | |
local ptCloud_topicName='velodyne' | |
lidar_pub=simROS.advertise('/'..ptCloud_topicName,'sensor_msgs/PointCloud') | |
end | |
function getTransformStamped(objHandle,name,relTo,relToName) | |
t=sim.getSystemTime() | |
p=sim.getObjectPosition(objHandle,relTo) | |
o=sim.getObjectQuaternion(objHandle,relTo) | |
return { | |
header={ | |
stamp=t, | |
frame_id=relToName | |
}, | |
child_frame_id=name, | |
transform={ | |
translation={x=p[1],y=p[2],z=p[3]}, | |
rotation={x=o[1],y=o[2],z=o[3],w=o[4]} | |
} | |
} | |
end | |
function sysCall_sensing() | |
data=simVision.handleVelodyneVPL16(h,sim.getSimulationTimeStep()) | |
--[[ | |
-- if we want to display the detected points ourselves: | |
if ptCloud then | |
sim.removePointsFromPointCloud(ptCloud,0,nil,0) | |
else | |
ptCloud=sim.createPointCloud(0.02,20,0,pointSize) | |
end | |
m=sim.getObjectMatrix(visionSensorHandles[1],-1) | |
for i=0,#data/3-1,1 do | |
d={data[3*i+1],data[3*i+2],data[3*i+3]} | |
d=sim.multiplyVector(m,d) | |
data[3*i+1]=d[1] | |
data[3*i+2]=d[2] | |
data[3*i+3]=d[3] | |
end | |
sim.insertPointsIntoPointCloud(ptCloud,0,data) | |
--]] | |
m=sim.getObjectMatrix(visionSensorHandles[1],-1) | |
point32 = {} | |
for i=0,#data/3-1,1 do | |
d={data[3*i+1],data[3*i+2],data[3*i+3]} | |
d=sim.multiplyVector(m,d) | |
point32[i+1]={x=d[1], y=d[2], z=d[3]} | |
end | |
-- Publish the Lidar PointClouds to ROS Topic | |
if not pluginNotFound then | |
pub_data={} | |
pub_data['header']={stamp=sim.getSystemTime(),frame_id="velodyneVPL"} | |
pub_data['points']=point32 | |
simROS.publish(lidar_pub,pub_data) | |
simROS.sendTransform(getTransformStamped(visionSensorHandles[1],'velodyneVPL',-1,'world')) | |
end | |
end | |
function sysCall_cleanup() | |
simExtVision_destroyVelodyneVPL16(h) | |
end |
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