A simple 2D rendering engine that simulates several 2D objects moving over a planar background.
Example
First set the absolute paths in multi_objects.conf and example.scene:
roscd esim_ros
gedit cfg/multi_objects.conf
roscd imp_multi_objects_2d
gedit scenes/example.scene
To run the example:
roslaunch esim_ros esim.launch config:=cfg/multi_objects.conf
You should get a result similar to this video.
To visualize the output of the simulator, you can open rviz (from a new terminal) as follows:
roscd esim_visualization
rviz -d cfg/esim.rviz
You can also open rqt for more visualizations, as follows:
roscd esim_visualization
rqt --perspective-file cfg/esim.perspective
Format of a scene file
The configuration of this rendering engine can be set through a scene file (example here).
A scene file with N layers has the following structure:
width height tmax (s)
<layer 1>
<layer 2>
...
<layer N>
where each layer line has the format:
path_to_image median_filter_size gaussian_blur_sigma theta0 theta1 x0 x1 y0 y1 sx0 sx1 sy0 sy1
describing which image should be used for the layer, how much preprocessing should be applied to it, and the parameters of the affine transformation it will undergo between t=0 and t=tmax