Lighting Challenge #5: Under The Boardwalk

#161

Hi Shankar, very good the image. But does only have vegetation under the port?

Hi sphere, great image, try to place more bumps!

Hi Sherif.Nagib, Liked your image, but I think the water is little dense, it is more similar to a glass roof! Perhaps it is better to place more light volume?

Hi akwavox, I loved your tropical family…lol

Hi JCBug, very Caribbean…

Hi MasterZap, very good the images, but doesn’t it think the water is very dense? We are dipped in gel… lol… Continue in the road.

Hi BarberofCivi, loved the transparency… it is one of the best.

Good work, friends. I am learning a lot sells your progresses. Very interesting that contest. Today I will order my wip… Good luck to all.

#162

Well Here is my WIP so far. I was out of town on shows, so I did not get a chance to work on it early on. My only complaint is that I can’t get any caustics from the water even though I have caustics on. ??? Using LW 8.5 if anyone cares to divulge some secret ingredient. My only light is a point light and some slight GI. I may try and do a fog free render and blend the two with photoshop. Using Skytracer2 for the sky.

-mark

#163

MasterZap I really like your image, and I don’t agree with who said it looks more like gel than water. I think it works well. One little thing if you allow me, is that you have such a nice image and then you look down to the rocks in the foreground and the texture looks nothing like rocks. Same for the wood. You can just download a photographic texture for the web and slap it on the geometry and you’ll see what a difference it is going to make.

Shankar, wow those light rays are awsome!!! Really well done. the only thing I can say is that I never saw rays get all the way to the bottom, they usually stop somewhere in between, unless the water is very shallow. Also I am not sure I have ever seen so many so evenly distributed throughout the water surface, usually I see them radiating from a smaller area, but that is just me.

I am curious to know what kind of render times you guys are getting, because mine is rendering at snail pace, which is so annoying because I don’t have much time to dedicate to it in the first place.

#164

Hi Beazly,

You can use an image projection on a spotlight to fake the caustics.

#165

Thought this might be of interests for you guys on this one…

http://www.seafriends.org.nz/phgraph/

Enjoy…

Craig

#166

Craig, that is an amazing web site, thank you so much for posting it!!! All those technical details make me want to try my hands at shader programming.

#167

I may try the texture pattern with a spotlight later tonight.

That was a very interesting read about underwater photography, lots of physics in there.

I think I might try and get my water better and maybe lose the fog and use particles.

-mark

#168

Hi GiarcNamwob, great sit… tanks!

Here is an update… hope a comments… tanks

[]'s
Diego

#169

Thanks for the comments.

JCBug - Yes, I tend to be scientific and try to create scenes realistically first rather than using artistic license. For the boat, it is abit reflective, but it has a bumpy surface which gives blurred reflections rather than smooth ones.

One more render before the weekend. I got a nice angle looking almost directly at the lightsource, but having it obscured by the dock. I may try to set a long render on this one with higher quality settings at some time (I’m still looking at ~1.5hr renders for these ‘test’ scenes…)

#170

BTW, found a couple more nice total internal reflection photos I found. (Watch for the bikini’d swimmer in the second…)

http://www.courtneyplatt.com/underwater/underwimages/11%20Turtle%20Refraction.JPG
http://www.reefpix.org/albums/album125/KN0X3485.jpg

#171

Anyone have good reference images for what shadows on the water surface look like, seen from below? All the shadows on the water surface that I see here look strange - too focused and contrasty, too much like the water were diffusely illuminated right along the top - but it would be great to have some ref images.

-jeremy

#172

Can’t find any images yet, but there really wouldn’t be shadows on the water surface. Any shadows come as a result of interaction with solids in the water. For miniscule objects, like murky water, this is in the form of atmosheric effects. The ‘shadow’ would be visible 3-dimensionally down through the water. Any shadow cast from above would not allow light to pass into the water to create the atmospheric effects. In my latest image, some of the shadow edges appear a bit harder mainly due to the viewing angle relative to the light source. I.e. along the front edge of the dock, we are almost looking directly along the 3-d shadow as it passes through the water towrd the camera, whereas along the side of the dock, you can see more the shadow edge passing down into the water.

#173

You really only see shadow “on” water if the water is really murky and muddy, and then you wouldn’t see ANYTHING from below in such water :wink:

Shadows are “in” water, i.e. volumetric, if you see them at all.

None of my renders have a shadow on the surface, the shadow you DO see is the reflection of the piers shadow on the sand.

That “physics of underwater photo” site was way cool. And some of those images look remarkably like some of the renders I’ve gotten and almost thought “nah, that can’t be right” and changed things! LOL. Like I had this render w. a HUGE over-water/under-water difference, inside “Snells window” and outside… but the photos clearly show that’s nothing strange at all.

It’s apparently really difficult to “intuit” this stuff w. underwater things.

/Z

#174

This is probably just a question for Master Zap -

What are the limits to internal reflections when rendering with DOF in MR? Are there any MR shaders you can recommend that do internal reflections in shots with DOF?

Here’s a simple comparison of the difference that turning on DOF on the camera makes to the appearance of a water surface (Maya PhongE shader, IOR of .75):

DOF_comparison.jpg810x520

-jeremy

#175

That’s really interesting. It looks like a bug in the renderer. The dock should stay completely hidden by total internal reflection. It appears like the water surface is a mix between an IOR .75 and an IOR 1.33 surface. The second image has the TIR from the first image mixed with an image that clearly shows the dock. Maybe it thinks some samples are from the front of the water surface, and some samples are from the back, so the IOR is reversed.

#176

Here are two more renders. Did some work on the water to get the Snell’s Circle. I decided to bag the underwater caustics for now. The look I was after is a small dirty pond look.

-mark

#177

Hi mbeazley, i loved… the second is the best… great!

The water texture is very good! :thumbsup:

[]'s
Diego

#178

More work…More tests…

#1

#2

[]'s
Diego

#179

Hi Silvia,
The Light Rays are done in Compositing. I rendered the Zdepth pass and Geo Matte pass. Then I did radial blur with random Image to cast the rays. Finally I subracted wiht the combination of Zdepth Pass and Geo matte pass. The software that I used is Maya and Shake. Thanks for your comment
-Sankar

#180

Hello Friends,
Here is my work in progress. Comments Plz…
Thanks
Shankar

180471876_64edaeaefe_o.jpg683x512