Is it possible to make a caustic from Direct light?

[Polymax]

Is it possible to make a caustic from Direct light in the PT+HD mode?
Now the direct light does not pass through the glass material (solid), well, what about the crystal chandeliers, where direct light must pass through the glass elements?
Or caustic should always be considered separately, the photons?

[Ondra]

You can increase max sample intensity (or set it to zero to completely disable it), but it will produce fireflies (they would eventually go away, but it might take a LONG time). Other possibility is to try bidir/VCM

[Ondra]

this would path tracing actually handle well.

Try using renderer: VCM/bidir, and set it to BDPT mode in its rollout. Photons are obsolete ;).