Water Caustics

[remon_v]

Re: Water Caustics

hey good job I´m also interested in the settings or it would be even better if you could upload the scene so we can take a look.

[NWB]

Re: Water Caustics

All the links to the models posted earlier on this thread have gone/broken.

It would be a great help to have a working model to download - my efforts based on the recent newsletter have not been sucessful !

Thanks...

[szkoski]

Re: Water Caustics

Hi,

I also keep having problems with water caustics and I would appreciate if you guys could send me a model or post it here again;

thank you in advance;

Cheers,

Piotr

[AcesHigh]

Re: Water Caustics

ah, please, SOMEONE HELP!!


There is something very wrong with VRAY... I followed the tutorials posted at the Downloads section but I still cant get caustics!

The links in this thread are broken... I am losing all my hair, really, I almost feel like punching my monitor out of desperation!!

I tried getting water caustics both indoors and outdoors. NONE worked.

[AcesHigh]

Re: Water Caustics

ok, it seems I finally got caustics. In the end, the only thing I needed really to do was to setup the caustics strenght to ASTRONOMICAL levels... like 100.000! (thats 100 thousand)

Quite different from the tutorials available for download here at ASGVis site!

In those tutorials, the guy sets caustics "strenght" (caustics multiplier, at VRAY Options) to about 200... no way that worked for me.

I tried doing caustics with both IrradianceMap+LightCache and IrradianceMap+DMC, both at default settings. It worked with the two.
Also, all the scenes are using Physical Camera.

TEST SCENE 1
*Omni Light - Multiplier 15, Caustics Subd 5000 (setting this lower will cause caustics to be low-res. The default was 1000, got kinda low res, I set it up directly to 5000, but I guess 2500 would have already got nice effects)
*Water - just downloaded it from the download area caustics tutorial. Its basically a simple plane with reflection, refraction and a noise displacement map
*OPTIONS > CAUSTICS - Max Photons 1000, Multiplier 100.000, Search Distance 0.5 (very important, the lower the search distant, more "FOCUSED" the caustics will be)




TEST SCENE 2
*Rectangular Light - Multiplier 0.1 (gee, never noticed I had to lowdown rectangular light so much to avoid having more light than a supernova exploding!), Caustics Subd 5000 (the 2500 got to coarse using rectangular light)
*Water - same as above but I upped the size of the noise, so the "waves" would more spread out

[AcesHigh]

Re: Water Caustics

unfortunatelly, all my tries at getting caustics with GI only failed miserably, even cranking the caustics multiplier up to a million...

please, the guys who were able to get caustics with sun only, at the previous pages... TELL US WHAT YOU DID!

[fpedrogo]

Re: Water Caustics

Hi all
I made a video tutorial show you how make caustics in Rhino. Here in SU is a litter bit difference. We have to use one additional parameter. That parameter is the "Photon emit distance" located in the sun/sky option. This option allow you to define the area in where the photons will be throw. In my test I have to increase this value to 100000. The default value was 150. I will make a video for the next featured download showing you how to do it, but I think that is fear for you if I share the scene now. Hopefully this scene can help you understand better how create caustics only with the sun system.

Best


Small caustics using small water waves.


Large caustics using large water waves

the link for the scene

http://www.mediafire.com/?zmzztck5jnm

[remon_v]

Re: Water Caustics

nice! thnx very much.... oke the question is with the "photon emit distance" where is the middle? at the "0" location?

[fpedrogo]

Re: Water Caustics

To tell you the truth in Max and Rhino it is the radius around the sun vector, but I'm not sure how the native SU sun work at all, in term of the real location.

best

[AcesHigh]

Re: Water Caustics

wow, thank you very much FPedrogo!

[camionero]

Re: Water Caustics

fpedrogo i cant recreate your results ..i put those values and nothing happened y raise everyting in the causticas options and nothing happend .. can you post some screns of the water material and the otions that create those caustics ?' THX

[fpedrogo]

Re: Water Caustics

Hi Camionero

fpedrogo i cant recreate your results ..i put those values and nothing happened y raise everyting in the causticas options and nothing happend .. can you post some screns of the water material and the otions that create those caustics ?' THX

Al final del post en donde puse las imagenes esta el link para que puedas bajar la escena.


The link to download the scene is below the images.

Best

[AcesHigh]

Re: Water Caustics

thanks for the help FPedroso. I was able to come up with this...

but... dont you think there is a WEIRD shadow on that pool water??That diagonal shadow should not be there...

I mean... look the wall shadow... it doesnt reach the water, nor the plants shadow.

the inside border of the pool not hit by the sun is seen there too.. its darker then the rest... on the very right its the water as it should be all over the pool, receiving direct sun light. But then there is that dark area, which is not getting any shadow from anywhere, its not unhit by direct sunlight as the left inner border of the pool... what the hell is happening there?

[fpedrogo]

Re: Water Caustics

Hi Aceshigh
That weird shadow is produced by the pool itself. I think that the pool is to thin and kind of depth and depending of the sun position and the camera angle you will get something like that.
Here is a picture of a pool and you can see that kind of shadows produced by the pool.

Best

[AcesHigh]

Re: Water Caustics

no pal, I dont think thats right.


check out this pic from above and tell me this is not a WTF

the sun is in a very high angle (check the plants shadows), no way the border would cast such a shadow across the pool. In fact you CAN see the shadow cast by the border... its quite dark, on the left... and then there is that OTHER weird shadow, a bit lighter, coming from NOWHERE! (not coming from above, as you can see on the floor around the pool)




edit: TURNED OFF CAUSTICS... look what happened