I want to use Blort. My camera is usb camera.When I run this command "roslaunch blort_ros learnsift,launch",there is an error: james@james-23-g131cn:~$ roslaunch blort_ros learnsifts.launch ... logging to /home/james/.ros/log/adc9f4fe-b5fb-11e6-afc0-0025ab75175f/roslaunch-james-23-g131cn-5896.log Checking log directory for disk usage. This may take awhile. Press Ctrl-C to interrupt Done checking log file disk usage. Usage is <1GB.

started roslaunch server http://james-23-g131cn:33770/

SUMMARY

PARAMETERS * /rosdistro: indigo * /rosversion: 1.11.20

NODES / blort_learnsifts (blort_ros/learnsifts)

ROS_MASTER_URI=http://localhost:11311

core service [/rosout] found process[blort_learnsifts-1]: started with pid [5914]

Learnsifts

Tracker control

[q,Esc] Quit program [Return] Save SIFT and ply models. [Space] Save texture face and extract SIFTS.

[4] Texture edge tracking [5] Texture color tracking [a] High accuracy tracking (less robust) [e] Show edges of image [i] Print tracking information to console [l] Lock/Unlock tracking [m] Switch display mode of model [p] Show particles [r] Reset tracker to initial pose [s] Save model to file (including textures) [t] Capture model texture from image [u] Untexture/remove texture from model

Object name: Pringles => Getting camera intrinsics ... [ INFO] [1480403058.192141087]: Camera parameters received. OK => Initialising tracker ... OpenGL Version: 3.0 Mesa 11.0.2 compile frag [Shader::Shader] Error compiling fragment shader "/home/james/catkin_ws/src/perception_blort-hydro-devel/perception_blort-hydro-devel/blort_ros/Tracker/shader//gauss.frag"No program [blort_learnsifts-1] process has died [pid 5914, exit code -11, cmd /home/james/catkin_ws/devel/lib/blort_ros/learnsifts /home/james/catkin_ws/src/perception_blort-hydro-devel/perception_blort-hydro-devel/blort_ros /blort_camera:=/usb_cam/camera_info /blort_image:=/usb_cam/image_raw __name:=blort_learnsifts __log:=/home/james/.ros/log/adc9f4fe-b5fb-11e6-afc0-0025ab75175f/blort_learnsifts-1.log]. log file: /home/james/.ros/log/adc9f4fe-b5fb-11e6-afc0-0025ab75175f/blort_learnsifts-1*.log all processes on machine have died, roslaunch will exit shutting down processing monitor... ... shutting down processing monitor complete done

And can I use kinect2 instead of stereo camera?