Global attributes

### 7.3.2 Global attributes

These attributes are shared by all objects of the same scene

- title="titlename" sets the title.
- labels=["xname","yname","zname"] sets names of the x,y,z axes.
- gl_x_axis_name="xname", gl_y_axis_name="yname", gl_z_axis_name="zname" sets the names of the axes individually.
- legend=["xunit","yunit","zunit"] sets units for the axes.
- gl_x_axis_unit="xunit", gl_y_axis_unit="yunit", gl_z_axis_unit="zunit" sets units for the axes individually.
- axes=true or axes=false shows or hides the axis.
- gl_texture="filename" sets the background image to "filename".
- gl_x=xmin..xmax, gl_y=ymin..ymax, gl_z=zmin..zmax sets the graphic configuration (do not use for interactive scenes)
- gl_xtick=xmark, gl_ytick=ymark, gl_ztick=zmark sets the tick marks for the axes.
- gl_shownames=true or gl_shownames=false shows or hides objects names
- gl_rotation=[x,y,z]: defines the rotation axis for the animation rotation of 3-d scenes.
- gl_quaternion=[x,y,z,t]: defines the quaternion for the visualization in 3-d scenes (do not use for interactive scenes)
- a few other OpenGL light configuration options are available but not described here.

#### Examples.

- Input:
  title="median_line";triangle(-1-i,1,1+i);median_line(-1-i,1,1+i);median_line(1,-1-i,1+i);median_line(1+i,1,-1-i)
  Output:
- Input:
  labels=["u","v"];plotfunc(u+1,u)
  Output: