Example 1: The Search distance parameter
Example 2: The light Caustics subdivs parameter
Example 3: The Max photons parameter

Example 1: The Search distance parameter

For this image, the Caustics subdivs parameter for the light is set to 50, so that the separate photons are more distinct; the global caustics Multiplier is 17000, and the Max photons is set to 60. As can be seen, the larger search distance produces blurrier caustics.

 

Search dist = 1
Search dist = 10

 

Example 2: The light Caustics subdivs parameter

This example is similar to the previous one, but the Caustics subdivs parameter for the light is increased to 300. The other parameters are the same as in the previous example. As can be seen, the larger number of photons produces smoother caustics effects than in the previous example.


Search dist= 1
Search dist = 5

Example 3: The Max photons parameter

For this example, the Caustics subdivs parameter for the light was set to 4000, the global caustics Multiplier to 17000, and the Search distance to 0.5. As can be seen, the larger value of the Max photons parameter in the second image causes the caustics to appear much smoother.


Max photons = 1
Max photons = 60