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"Alain" <ele### [at] netscape net> schreef in bericht
news:49b5d871$1@news.povray.org...
>>
> The 45 degree angle is the angle for a precise speed, twice the speed of
> the waves in the water for a given depth. The wake angle depend on the
> speed of the ship trough the water and the depth.
Ah! You know more about this than I do, obviously :-) Didn't know that.
Thomas
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Thomas de Groot nous illumina en ce 2009-03-10 05:17 -->
> "Alain" <ele### [at] netscapenet> schreef in bericht
> news:49b5d871$1@news.povray.org...
>> The 45 degree angle is the angle for a precise speed, twice the speed of
>> the waves in the water for a given depth. The wake angle depend on the
>> speed of the ship trough the water and the depth.
>
> Ah! You know more about this than I do, obviously :-) Didn't know that.
>
> Thomas
>
>
Simple observation.
When a row boat advance, the wake is very broad, 60 to 90 degrees and can detach
from the bow (go faster than the boat).
When you watch a speed boat, the wake is perty sharp, maybe around 15 degrees or
even less if you go fast enough.
On a cruise ship going at cruise speed, the width of the wake from the bow at
the stern level is MUCH narrower than the length ot the ship.
--
Alain
-------------------------------------------------
Caught Asleep At Your Work Desk
Just in case your boss catches you asleep at your desk, be ready to blurt out
this excuse #1: I was working smarter - not harder.
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"Alain" <ele### [at] netscapenet> schreef in bericht
news:49b6de92$1@news.povray.org...
> Simple observation.
>
> When a row boat advance, the wake is very broad, 60 to 90 degrees and can
> detach from the bow (go faster than the boat).
>
> When you watch a speed boat, the wake is perty sharp, maybe around 15
> degrees or even less if you go fast enough.
>
> On a cruise ship going at cruise speed, the width of the wake from the bow
> at the stern level is MUCH narrower than the length ot the ship.
>
I probably never paid really attention when on water (which has not been
that often) and from shore you have to be at a certain altitude I suppose to
really appreciate the effect. I shall note this down for later use. Thanks
for this!
Thomas
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CShake wrote:
> Arttu Voutilainen wrote:
>> I think this one is starting to look pretty good. Since last version
>> I've changed the texture on the trees, fixed the problem I had with
>> media and turned water-plane into an isosurface.
>>
>> Took 25h 30min to render with pov3.7-b29 on AMD64 3500+.
>>
>> So, any comments, critiques, anything?
>>
>> -- Arttu "Blizzara" Voutilainen
>> -- http://blizzara.zbxt.net:8000/Plone/
>>
>>
>> ------------------------------------------------------------------------
>>
> Very nice water (texture, reflection, basic shape)!
Thanks!
> One thing I'd suggest is making the water interact with the shore a
> little more, right now it just seems to flatten out at the edges. With
> real water, the height of the wave above the neutral surface plane
> changes with the depth, with waves slowing down and getting both taller
> and thinner as they reach the shore. Right at the shore they may break
> if the seabed has a shallow angle, though maybe not with waves this small.
>
Yeah, I know. I thought about that, but I wasn't sure how water was
supposed to function at the shore. Also I was happy to get it work the
way it does now (flattening out at the edges) so I let it be. I guess
I'll try to fix the waves first and the have a look at this.
> Similarly the waves seem to remain the same height as they go to the
> horizion - usually at that distance various frictional losses and such
> in the water will make the ripples decay, which doesn't seem to happen.
>
> Think about what is causing the waves, where is it and is it really
> making such uniform disturbances?
Well, it was actually supposed to be wind (I know it doesn't look like
that).
-- Arttu "Blizzara" Voutilainen
-- http://blizzara.zbxt.net:8000/Plone/
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Christian Froeschlin wrote:
> Great image! I actually had to go back to the original
> thread to convince myself this was the same scene just
> with some considerable improvements ;)
>
Thanks!
> The water horizon looks a bit oddly shaped to me. It may
> be the wave function, your sky object, or my eye-sight ;)
I guess it's the wave function. Not sure why it looks like that though..
-- Arttu "Blizzara" Voutilainen
-- http://blizzara.zbxt.net:8000/Plone/
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Warp wrote:
> I'm not sure if the sailboat is deliberately just a "placeholder" for
> your final design, but if it isn't, then I think it's a bit too plain
> and lacking in detail. Looking at real sailboats might give some ideas:
>
It's actually somewhere between. I haven't thought about the ship too
much yet, but at least it needs some textures. Now it's using only plain
pigments (with double_illuminate for the sails).
> http://www.terragalleria.com/images/us-se/usfl3997.jpeg
>
> Flags, ropes, details (and better shading) of the sails...
Yep. I tried to model some ropes there, but it didn't look too good. I
have to try it again, after I get the waves fixed.
-- Arttu "Blizzara" Voutilainen
-- http://blizzara.zbxt.net:8000/Plone/
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clipka wrote:
> Arttu Voutilainen <blizzara.REM0VE7H!S### [at] zbxtSP4MM3Rnet> wrote:
>> So, any comments, critiques, anything?
>
> The sails still need a bit of work. It's textile, so maybe a bit of
> transmittance might work. Anyway it needs some more texturing.
>
Yep, I am aware of that. At the moment it's just a plain color with
double_illuminate.
> That said - impressive shot; a well invested day of rendering time!
Thanks!
-- Arttu "Blizzara" Voutilainen
-- http://blizzara.zbxt.net:8000/Plone/
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Kenneth wrote:
> I liked your original, and now it's looking even better!
Thanks!
> I was wondering about the main water waves: Since I can't really see what they
> look like on the 'other side' of the boat, I'd suggest ending the current water
> object AT the boat (as seen from the camera), then making a 'mirror image' of
> the wave object for the far side of the water. That way, the boat will appear
> to be cutting through the water, leaving angled wakes on BOTH sides of its bow.
>
> The other thing I might critique is that the water waves seem to be at too much
> of a right angle to the boat's direction. Perhaps that's just the camera
> angle; but I think they should fanning out from the boat at maybe 45-degrees or
> less--in other words, the wave direction being a bit closer to parallel with the
> boat's hull (although NOT parallel, of course.)
Hmm, I never even thought about that ship leaving waves :P They are
supposed to be created by wind, even though I know it doesn't look like
that. It's just a wave-pattern with some turbulence, and the mid-point
being one hundred meters left from the boat.
Actually, judging by the pictures I found on teh web, a sailboat like
this probably wouldn't leave waves at all (or at least they would be
very small). I'll try to make the waves look more like they're supposed
to, and see how it works.
>
> Ken W.
>
-- Arttu "Blizzara" Voutilainen
-- http://blizzara.zbxt.net:8000/Plone/
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Spock wrote:
> I've looked at this image several times now and I think I agree with the
> others that the curve in the waves is unusual/distracting. If they
> represent waves on the sea then they shouldn't curve like that.
True. That's what they are supposed to represent, and I know they
shouldn't curve like that. I still thought it looked pretty nice, and
decided to render it that way, to see if turning the water into an
isosurface had some effect.
They
> should probably remain parallel or curve the other way (based on
> interference as they enter the bay). If this is a wake from the ship
> then the waves should fan out at a 45 degree angle as Kenneth suggests.
> I think the problem I'm having is coming up with a reasonable
> explanation for the curvature of the wave pattern. It's almost like a
> speed-boat just passed through the scene from right to left... an
> explanation which seems out of place given the other elements you
> present...
Yep, a speedboat could probably explain those waves, but it doesn't fit
to the image otherwise (and it's not really what I was thinking about
when I coded the water). I'll try to make the waves look better after
next weeks matriculation examination of geography. Been a bit busy
reading to exams now.
> Love the scene. Looking forward to future iterations.
>
Thanks!
-- Arttu "Blizzara" Voutilainen
-- http://blizzara.zbxt.net:8000/Plone/
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Thomas de Groot wrote:
> Really improving indeed. Very nice view.
Thanks!
> The waves, like others already said, need more thought. Are they coming from
> the sea (at right)? Then they should curve the other way round due to the
> interference with the shallowing sea bottom which slows them down. They are
> obviously not the wake of the ship as they are also present in front of it.
Yep. They were supposed to be created by wind and come from left, but I
spent most of my time making the isosurface actually render correctly
with the water/shore intersection; the waves are just a wave-pattern
with some turbulence. I'll spend more time on waves after these
matriculation exams and all the rest boring school-stuff. (Well,
actually, they're not that boring, but they do eat my time.)
> A slight wake (45 degrees) should be nice to add in that respect.
I'll try that when I get the waves look they way they're supposed to,
but in the images I found on google there aren't really much wake from
sailboats. I'll give it a try and see how it looks.
> Thomas
>
>
-- Arttu "Blizzara" Voutilainen
-- http://blizzara.zbxt.net:8000/Plone/
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