Author Topic: 15 miles on the Erie Canal  (Read 14197 times)

Online Dune

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Re: 15 miles on the Erie Canal
« Reply #45 on: March 19, 2018, 05:52:39 AM »
It was theoretical, but I just tested and strangely it doesn't work as I expected. Maybe it's because I tested on an older version of TG (only 32-bit one on this machine). So if anyone can make this to work, it would be handy.

Nice update, btw.

Offline sboerner

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Re: 15 miles on the Erie Canal
« Reply #46 on: March 19, 2018, 01:50:35 PM »
Thanks. If I have a chance later today I'll play around with that setup. It oughta work.

Offline archonforest

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Re: 15 miles on the Erie Canal
« Reply #47 on: March 19, 2018, 03:31:40 PM »
getting there... ;)
Dell T5500 with Dual Hexa Xeon CPU 3Ghz, 32Gb ram
Amiga 1200 8Mb ram, 8Gb ssd

Offline sboerner

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Re: 15 miles on the Erie Canal
« Reply #48 on: March 20, 2018, 03:34:54 AM »
Quote
It was theoretical, but I just tested and strangely it doesn't work as I expected. Maybe it's because I tested on an older version of TG (only 32-bit one on this machine). So if anyone can make this to work, it would be handy.

Your idea works fine here brilliantly, actually. Thank you so much for posting those screen shots. I misunderstood the role of the transform input shader, but it became very clear once I started working with it. So useful!

I warped the simple shape instead of using a fade. (The fade caused the fake rocks to gradually disappear.) If I need a more irregular edge I can always paint the mask manually.

80093-0

80095-1

Online Dune

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Re: 15 miles on the Erie Canal
« Reply #49 on: March 20, 2018, 05:44:40 AM »
Glad it worked for you. I have to try the setup in a better TG4 version again, not understanding why the colors faded so much. Perhaps the old transform shader is less 'good' (which is a silly assumption  ::)).

Offline bobbystahr

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Re: 15 miles on the Erie Canal
« Reply #50 on: March 20, 2018, 01:31:56 PM »
Quote
So useful!



(Attachment Link)

(Attachment Link)



Indeed, it was and is one of the most useful shaders that Dune pointed me at as well. It's now part of most of my texture setups...works on clouds as well.
something borrowed,
something Blue.
Ring out the Old.
Bring in the New
Bobby Stahr, Paracosmologist

Offline otakar

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Re: 15 miles on the Erie Canal
« Reply #51 on: March 20, 2018, 05:01:39 PM »
Great project! Super quality renders and of course the modeling. Thanks for sharing!

Offline sboerner

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Re: 15 miles on the Erie Canal
« Reply #52 on: April 06, 2018, 02:55:13 PM »
Running some test renderings of Kelvin wake patterns while preparing models of the canal boats and tug that will be needed for the scene.

80710-0

The displacement map was made from an image I found online and tweaked in Photoshop. The same image map is piped through two transform input shaders to create the bow and stern wakes. (The transform input shader is quickly becoming one of my workhorse shaders. Thanks again, Ulco.)

Previous forum discussion of Kelvin wakes:

https://planetside.co.uk/forums/index.php/topic,19721.msg194253.html#msg194253

Good layman's discussion of how they're formed and how to calculate their sizes:

http://www.steelnavy.com/WavePatterns.htm

I would give my eyeteeth for an application to generate Kelvin wake displacement maps. Found a few promising but broken links online for Maya plugins, etc., but not much luck till I stumbled across this:

https://www.boatdesign.net/threads/zgreen-wave-patterns-made-by-havelock-sources.36112/

Seems like this might be the answer but (of course) it's DOS only. If anyone knows of a Mac (or Unix) equivalent that would be great.

I'd like to be able to generate arbitrarily sized patterns that could be accurately scaled and still extend a proper distance behind the boat. The speed limit at this time on the canal was 4 mph (to mitigate wake damage to the canal banks), so the transverse waves of the wake pattern should be about 6 feet apart.

Interesting topic a week ago I'd never heard of Kelvin wake patterns.


Offline luvsmuzik

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Re: 15 miles on the Erie Canal
« Reply #53 on: April 06, 2018, 03:04:43 PM »
All about R&D, Well done!  :)

Offline sboerner

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Re: 15 miles on the Erie Canal
« Reply #54 on: April 06, 2018, 03:24:20 PM »
Thanks! This project just keeps getting more interesting. Much to learn.

Offline bobbystahr

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Re: 15 miles on the Erie Canal
« Reply #55 on: April 06, 2018, 03:57:08 PM »
Thanks! This project just keeps getting more interesting. Much to learn.

We all I feel have, 'Ulco the Transform Disciple' to thank for that. It's in every stack I make nowadays...My previous connection to Kelvin  wake was when I attended Kelvin's Wake a few years back...Live and Learn eh? thanks for the references and by the way, best wake yet
something borrowed,
something Blue.
Ring out the Old.
Bring in the New
Bobby Stahr, Paracosmologist

Online Dune

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Re: 15 miles on the Erie Canal
« Reply #56 on: April 06, 2018, 04:36:03 PM »
That's an extremely nice wake, would you be willing to share? Some generator would be great indeed, as all you need is a simple output in greyscale. 

Offline sboerner

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Re: 15 miles on the Erie Canal
« Reply #57 on: April 06, 2018, 05:30:20 PM »
Thanks, no problem sharing. It's a 32-bit exr file. I can post a link.

Pretty easy doing a wake on flatwater with a very slow-moving boat with no prop.  :D  At some point I'll try to add a bow crest.

It looks like the application file in the third link above will generate custom image files, at least as far as I can tell from the documentation. It's been years since I've run a DOS batch file, though, so I don't know how much trouble that might be these days. I'd be curious if anyone wants to try. If it were Unix it would be a snap here.


Online Dune

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Re: 15 miles on the Erie Canal
« Reply #59 on: April 07, 2018, 07:42:03 AM »
Thanks a lot, Steve. Can't one run this .bat file from the dos-prompt?

 

anything