# This app calculates 3D Harris keypoints on voxel grids (sdf grids) with opengl compute shader on a offscreen framebuffer

## Create virtual display for your gpus

### Tell nvidia app to create a fake display with some resolution

1. copy/backup following file: /etc/X11/xorg.config

2. nvidia-xconfig -a --use-display-device=None --virtual=1280x1024 

3. reboot (really do it otherwise it won't work)

### Start xserver

1. Check if X is running

ps aux | grep X
my system produced: 
"root 1945 0.1 0.1 212380 51960 tty7 Ss+ 14:23 0:04 /usr/bin/X :0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch"

2. If you get a similar output, kill X: 
sudo service lightdm stop

3. Check if X is still running 
ps aux | grep X
<should be="" empty="" now="">

4. start local X
/usr/bin/X :0 </dev/null &>/dev/null &

5. check the configuration 
env DISPLAY=:0 glewinfo | less

6. set new display
export DISPLAY=:0