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Richard Hebert
04-12-2012, 10:06 PM
I'm still using 9.6, can someone direct me to any detailed tutorials for using caustics in that version? I'm seeing caustics in water renders but it's appearing like splotches as opposed to what you might see in a swimming pool. I've scoured the internet for tuts (free or for purchase) but keep coming up empty handed. Thanks for any suggestions.

Richard

oobievision
04-12-2012, 10:14 PM
http://www.google.com/url?sa=t&rct=j&q=&esrc=s&frm=1&source=web&cd=2&ved=0CDcQFjAB&url=http%3A%2F%2Fwww.ecst.csuchico.edu%2F~ranger%2 Fsamples%2FAPCG330%2Ftutorials%2FTutorial_Funk_Chr is.pdf&ei=6KeHT4-IKob50gHKtZjLCQ&usg=AFQjCNGzaLLj9ea97M3yDrSPF7rSLWNSyA&sig2=er96r-62FmzFW24rlLMjlQ

Richard Hebert
04-12-2012, 11:10 PM
Thanks for the tip. I saw that site earlier today but I'm still having issues with getting a realistic water caustic effect. I've included a sample from Cinema 4d that has the effect that I'm trying to achieve. The image is simple but shows what I'm after.

blugenwitz
04-13-2012, 04:28 AM
Maybe better to fake it? With caustic generator you can have something very similar without a problem. http://www.dualheights.se/caustics/

Richard Hebert
04-13-2012, 12:53 PM
Thanks for the tip. I'll look into it.

Iain
04-14-2012, 04:19 AM
Lightwave caustics are awful. To get the best results however, use a spotlight very close to the caustics emitting object and affecting nothing else.
Then play with the other settings. Softness makes things less realistic but you cant totally do away with it.

Seriously though, fake it or use Maxwell or Vray-its not worth the effort :hey:

XswampyX
04-14-2012, 12:02 PM
I had a play. 8 mins in Lw 11. and 54 min in lw 10.

I don't have 9 installed so It might not work, or be very slow.

http://i465.photobucket.com/albums/rr16/xXswampyXx/CausticBox11.jpg

Richard Hebert
04-14-2012, 12:28 PM
Thanks guys, I'll open the scene file in 9.6 and see what happens. There really aren't a lot of parameters to tweak for caustics in LW 9.6 so I was stumped by some of the animations that I saw on the web. Thanks for clearing up some of the mystery.

Richard

Richard Hebert
04-14-2012, 02:32 PM
OK, had to really exaggerate the settings but finally got something acceptable at least from this particular angle. The settings that I wound up using are:

Intensity = 300
Accuracy = 5000
Softness = 100

This is a massive departure from the default settings which should be changed to get something more usable to begin with. I mean, who really knows that the accuracy setting needs to be set to something in the thousands to get a decent result?

Richard

XswampyX
04-14-2012, 03:06 PM
.....

This is a massive departure from the default settings which should be changed to get something more usable to begin with. I mean, who really knows that the accuracy setting needs to be set to something in the thousands to get a decent result?

Richard

Well that's two of us. It's tempting to turn up the light intensity, but that doesn't work.

Looks pretty good. :thumbsup:

Richard Hebert
04-14-2012, 03:29 PM
Thanks for the scene file. The settings are extremely close to what I discovered through trial and error. Wish I had opened your scene file first! Would have saved a lot of time!
Thanks again guys.

Richard

Iain
04-15-2012, 08:02 AM
Impressive results guys! I take it all back.
Have you have any luck with small objects, e.g. a glass on a table?

Richard Hebert
04-15-2012, 03:28 PM
Nah, just started applying caustics couple of days ago and haven't delved into it until this particular part of a project. My use of it is large scale at the moment but I'll eventually get more involved in the finer points of surfacing.

Richard

XswampyX
04-15-2012, 05:12 PM
Impressive results guys! I take it all back.
Have you have any luck with small objects, e.g. a glass on a table?

No. It always comes out either blurry or blobby. :mad: I've spent hours trying different things.

http://forums.newtek.com/attachment.php?attachmentid=103514&stc=1&d=1334531476

This just happens in Octane.

erikals
04-15-2012, 06:56 PM
post work might be the solution...

hey, MUCH better LW11 vs LW10 render-times, cool...

magoo
04-16-2012, 12:09 AM
Intensity = 300
Accuracy = 5000
Softness = 100

This is a massive departure from the default settings which should be changed to get something more usable to begin with. I mean, who really knows that the accuracy setting needs to be set to something in the thousands to get a decent result?

Richard

There's a lot to be said about having settings which deliver a pleasing result off the bat.

DigitalSorcery8
04-16-2012, 12:33 AM
There's a lot to be said about having settings which deliver a pleasing result off the bat.

You mean like presets? :cursin:

Richard Hebert
04-16-2012, 09:11 PM
Gee, who would have guessed... Presets! Sorry, felt compelled to chime in. Also had to throw a skate in the tank to test the caustic intensity setting against a texture. Skate is still being modeled. Texture was just thrown on for the time being.

Richard

sami
04-16-2012, 09:32 PM
You mean like presets? :cursin:

Somebody create awesome presets for surfaces, caustics, hypervoxels and everything in LW in one big bundle and I will pay $$ for it. It is ridiculous that default settings are often nowhere near the funky magic numbers you need to pull off alot of things in LW.

Richard Hebert
04-16-2012, 09:42 PM
Does LW 11 still require 'funky magic' or do settings actually reflect real world adjustments for the most part? For example, lights that allow you to adjust the amount of 'lumens' emitted. I have no idea how bright 25% actually is... when I see a light bulb marked 1500 lumens in the store and I want to duplicate that light's output. Would be kinda useful.

Richard

erikals
04-16-2012, 09:50 PM
Somebody create awesome presets for surfaces...

posted some surface preset links here...
http://forums.newtek.com/showthread.php?t=127028

 

Afalk
04-17-2012, 10:03 AM
Those are prety nice, and preset central is always fun :D