The
number of photons emitted from the light controls specifies the
number of photons in the Photon Map. Photons can be emitted until
either a specifed number has been stored or until a maximum number
was emitted.
The default value of is 10 000 which renders in
a reasonable amount of time. Low numbers of emitted photons are
calculated in faster render times but create blurry effects. Very
low values in this case 100 can be used to show a quick estimate of
where photons are stored in the scene.
High numbers of
photons emitted from the light source increase the precision of the
caustic effect. Good quality caustic effects require values of at
least 100 000 and the numbers can range up tp 1 000 000.
This value is proportional to the time taken for calculation
at rendering and so the highest values will take a longer and are
generally only used for final renderings.
The graininess
which can be seen opposite can be reduced by increasing the accuracy
not by changing the number of the photons.
