For example these Dophins were done by painting the effects right onto the Dolphin texture map. Can this be inhanced or can this effect be reproduced with poser five's lights and fire fly ray tracer?

I did it once in P4 with a trans trick. I took the square prop and applied a trans map raised it above the scene. Added a spotlight and moved it way up and turned up the intensity. Got the idea from the gels they put in front of spotlights.

I believe that in P5 you can apply a texture map to a light thus creating shadows and shades. I did it once with forest leaves and it looked quite nice;)

Actually, I believe there's a caustics shader that fakes real caustics on objects in a scene for P5. Check in your materials pallet for it. Might work, but i never tried it before.

P5 SR3 volumetric/atmospheric lighting can simulate caustics.....CL tech support said so....didnt try it yet

There is no node called "caustics" in Poser5 SR3. But the effect on the dolphins can be duplicated like Ariah said. You just apply a texture on a light to make a gel.

simulation of caustics can be done in SR3 by using the different nodes and plugin em into the lights and volumetric/atmospheric lights the light bending that strikes the dolphins can be done by atmospheric lighting together with say the clouds node pluged into it..and plus yull get shadows cast....you need shadows on the ocean floor BTW in the pic above if light is coming from where i think its coming from.....