> Hi!
> Why the caustic displays an object grid?
> How to get rid of it?
>

Your object is obviously very close to the light_source, causing the 
photons to spread a lot. What you see is not a grid but a distorted spiral.

This is caused by the spiraling pattern used to shoot photons.

Try increasing count by something like *4, if you use count, or reducing 
spacing by half, if you use spacing.

Also, you may try using jitter 0.5 to 1.0 in the photons block in the 
global_settings.

If you intend to use an area_light later, add photons{area_light} in the 
light's definition. Not always usefull, but can make a huge difference 
in this case.



Alain

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