Caustics

suvakas · Post by **suvakas** » Wed May 23, 2007 2:31 am

Wow neepneep! That "sss water" looks great!

I also made one half filled cornell a while ago. I guess i don't have sharp caustics because the light source is too large.

Kram1032 · Post by **Kram1032** » Wed May 23, 2007 2:35 am

yes, for sure!
try a cylindral cone, that is a perfectish mirror, with a lightsource inside, that has a lens beyond it

will give great effects, I guess.
100% of the scene is indirectly lit, so, definately use Metropolis, in that case

motorsep · Post by **motorsep** » Wed May 23, 2007 5:21 am

suvakas,

cool, very nice too!
So would anybody share tips/tricks/workflow/scenes maybe? please!

CTZn · Post by **CTZn** » Wed May 23, 2007 10:09 am

Well motorsep, first you have to model a similar box

What version of Indigo are you using ? Can you use medium already ?

neepneep · Post by **neepneep** » Wed May 23, 2007 10:43 am

Here's an update, i'm still rendering it at 1200x1200 so it is still very noisy...

Also, in order to view into both mediums (air & water), you need to chop the end of the water mesh off and then put the camera as in the pic below....

I made the ripples with a displacement map from Blender's wood texture.

Also this scene seems to make Indigo 0.8 stable crash for some reason but 0.8 test 3 renders fine.

neepneep · Post by **neepneep** » Wed May 23, 2007 10:50 am

Oh yea, and the water settings:

Code: Select all

<medium>
		<name>Water</name>
		<precedence>9</precedence>
		<basic>
			<ior>1.33</ior>
			<cauchy_b_coeff>0.003</cauchy_b_coeff>
			<absorption_coefficient_spectrum>
				<rgb>
					<rgb>0.18 0.036 0.018</rgb>
				</rgb>
			</absorption_coefficient_spectrum>
			<subsurface_scattering>
				<scattering_coefficient_spectrum>
					<uniform>
						<value>0.12</value>
					</uniform>
				</scattering_coefficient_spectrum>
				<phase_function>
					<uniform/>
				</phase_function>
			</subsurface_scattering>
		</basic>
	</medium>
	<material>
		<name>Water</name>
		<specular>
			<transparent>true</transparent>
			<internal_medium_name>Water</internal_medium_name>
		</specular>
	</material>

suvakas · Post by **suvakas** » Wed May 23, 2007 6:19 pm

Hmm..correct me if i'm wrong, but if you cut off one end like this, then it's still a single plane solution. Isn't it?

CTZn · Post by **CTZn** » Wed May 23, 2007 11:58 pm

Same question here. If you chop the end in front of the camera then lines won't be optically broken by refraction when they dive below water level. Actually if you want a sharp edge in front of the camera for water you can chop that side, but then refill it with a plane (aka extrude edges down+splitmodifier).

neepneep · Post by **neepneep** » Thu May 24, 2007 12:10 am

I think you're right Suvakas & ctzn

Next time around I will try using a closed mesh but with a glass pane overlapping on one end (like an aquarium)

edit: This way works much better, I don't know why I didn't just do this to begin with

It works the same way that Ono prescribed for a glass of water.

suvakas · Post by **suvakas** » Thu May 24, 2007 12:45 am

Yeah, seems promissing.

Kram1032 · Post by **Kram1032** » Thu May 24, 2007 1:34 am

that may be the best solution

CTZn · Post by **CTZn** » Thu May 24, 2007 1:44 am

neepneep · Post by **neepneep** » Thu May 24, 2007 9:45 am

Once step closer...

The glass pane is way to thick (like seaworld aquarium glass thick) so now I retry it with super strong 5 mm thick glass and more water.

CTZn · Post by **CTZn** » Thu May 24, 2007 10:19 am

Me wanting ducky to float

Seriously I believe the effect would be stronger if you put an object both above and under water...

Post by **OnoSendai** » Thu May 24, 2007 3:46 pm

No need for the glass pane

Caustics

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