CERN Program Library Long Writeup W5013 - CERNLIB ...

and for all the levels belowit.
When for a volume the attribute FILL is > 1 (and the
option SHAD is on), the ABS of its colour code must be < 8
because an automatic shading of its faces will be
performed.
’FILL’ (1992) fill area -7,...,0,1,...7 (default=0)
when option SHAD is ’on’ the FILL attribute of any
volume can be set different from 0 (normal drawing);
if it is set to 1, the faces of such volume will be filled
with solid colours; if ABS(FILL) is > 1, then a light
source is placed along the observer line, and the faces of
such volumes will be painted by colours whose luminosity
will depend on the amount of light reflected;
if ABS(FILL) = 1, then it is possible to use all the 166
colours of the colour table, becouse the automatic shading
is not performed;
for increasing values of FILL the drawing will be performed
with higher and higher resolution improving the quality (the
number of scan lines used to fill the faces increases with FILL);
it is possible to set different values of FILL
for different volumes, in order to optimize at the same time
the performance and the quality of the picture;
FILL0 and