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Posted on 03/06/09 4:36:57 PM |
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Deborah Morley
Makeover Magician Posts: 1319 Reply  |
Bridge perspective
Well, this one really got me foxed. I was trying for ages to get the reflection of the underside of the little walkway and couldn't get it to look right. I don't know if it is because the walkway is at an angle or what. I even set it out on a mirror, but still couldnt get it right in PS. Any help would be greatly received.  |
Posted on 03/06/09 5:11:04 PM |
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Gerard
Digital Dutchman Posts: 145 Reply  |
Re: Bridge perspective
Hi Deborah, This is a tricky one!! You are right about the perspective, that's the key to good reflection in this, I should'nt worry to much about the duck, you don't see a lot anyway Here is my attempt, hope you see what I have done, Greetings, Gerard Digital Dutchman PS the actual board could be lift up a bit with the perspective feature in scaling etc. 
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Posted on 03/06/09 5:32:57 PM |
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David Asch
Tech Support Posts: 1913 Reply  |
Re: Bridge perspective
The problem is the perspective of the bridge doesn't match the rest of the scene. However the reflection is placed it will always look wrong. Skewing it and making it shorter means we wouldn't be able to see the underside anyway.  _________________ It must be Thursday, I never could get the hang of Thursdays |
Posted on 03/06/09 6:01:59 PM |
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Deborah Morley
Makeover Magician Posts: 1319 Reply |
Re: Bridge perspective
Thanks Gerard. And thanks David, I was trying to angle the walkway so the duck would look like it was walking up it, so messed up the perspective. Just goes to go show! |
Posted on 03/06/09 8:57:16 PM |
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Steve Caplin
Administrator Posts: 7047 Reply  |
Re: Bridge perspective
This is a tricky one. Maybe I'll show how it works on Friday! |
Posted on 03/06/09 9:15:32 PM |
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Deborah Morley
Makeover Magician Posts: 1319 Reply |
Re: Bridge perspective
Be great if you could, but please don't set it as a Friday Challenge; it's frazzled my brain enough as it is! |
Posted on 04/06/09 00:58:18 AM |
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Jota120
Ingenious Inventor Posts: 2615 Reply  |
Re: Bridge perspective
I know "frazzled" ..... refractions and reflections Damien H. Did-my-head-in with the refractions, even after Friday, but think I have it sort of sorted now. Steve, solved a fundamental problem on reflections on water for me(us), so interested to see his ideas on Friday....... ,but I'll think too ..... 
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Posted on 04/06/09 08:37:45 AM |
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Gerard
Digital Dutchman Posts: 145 Reply |
Re: Bridge perspective
Steve, you would do me a hugh favour to get into this issue! It's better to admit that you have learned this from the master rather then mess around with my own silly attempts!! Digital Dutchman PS thanks for the name, Steve, highly appreciated!! |
Posted on 04/06/09 09:11:50 AM |
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Steve Caplin
Administrator Posts: 7047 Reply |
Re: Bridge perspective
OK, here's a little tutorial. Seemed to make more sense to place it here rather than in the write-up on Friday, since I see Deborah has wisely changed tack in her Friday Challenge entry! The first thing to realise is that we're looking at the mine and its reflection from two different viewpoints. We're looking almost straight ahead at the mine, from just above the half way mark. This means that we're looking down on the reflection. So whatever is inside the mine is necessarily behind the face of it, so needs to be moved up in order to be looking at it from the correct angle. Which is a long way of saying that the duck inside needs to be raised, and we need to adjust the view of that projection slightly: 
When we're placing the reflection of the bridge - the really tricky issue - we do of course have some pointers to help us. We know where it touches the mine, of course - just below the door, as the original does. But we also know the reflection must touch the original bridge at the line where it enters the water. That means, Gerard, that we should see the top of the bridge reflected, not the bottom. It's a bit of a fiddle with Free Transform, as it's such a sharp angle, but this is more or less how it should look: 
Once we add the side back to give the bridge some depth, it starts to make more sense as a three dimensional object. It's the changed angle of view that causes this flattened perspective: 
The duck itself is an independent object. We're viewing it side on, which means we can consider it if it were a plane at right angles to the surface of the water, so its perspective is unchanged. When we place it on the bridge, we can see how its head now projects above the doorway in the reflected version - again, due to the changed viewpoint of the reflected scene: 
Darkening the reflections with an Adjustment Layer helps to make the reflection look more reflected, as some light is inevitably lost in the process: 
Of course, to make the mine really blend in with its surroundings we need to add ripples to the whole reflection (Wave filter) followed by some pond ripples around the base of the bridge (ZigZag filter). The bridge itself is now barely visible, but at least we have the satisfaction of knowing we got the reflections right! 
Hope this helps. And despite your pleas, Deborah, I think something along these lines would make the ideal subject for a Friday Challenge! |
Posted on 04/06/09 4:28:23 PM |
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Deborah Morley
Makeover Magician Posts: 1319 Reply |
Re: Bridge perspective
Many thanks for that Steve. I now realise my 1st problem attempting it was that as I looked in my mirror set-up I kept changing my angle of view; so I could see the underside of the walkway! 2 I didn't take into account the changed viewpoint of the reflection as in the size of the duck on the walkway and 3 I was trying to distort the walkway the wrong way round! which PS did not like! Certainly learnt from this one - thank you. |
Posted on 04/06/09 7:29:58 PM |
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Gerard
Digital Dutchman Posts: 145 Reply |
Re: Bridge perspective
Surely helped me to understand the reflection issue. I realised that the one I did was not accurate because of the bottom and top. Sorry Deborah! It's surprisingly easy to see how thing finaly come together, Thanks Steve! Gerard |
Posted on 05/06/09 09:43:32 AM |
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Sophie
Political Parodist Posts: 595 Reply  |
Re: Bridge perspective
Excellent tutorial! |
Posted on 05/06/09 09:58:23 AM |
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Jota120
Ingenious Inventor Posts: 2615 Reply |
Re: Bridge perspective
Just to support Steve's explaination, and convince myself, thought I'd run a quick experiment to see what is going on. Sorry pictures not so clear (dubble reflection at low level of incidence, glass and mirror). Two on left, low level of incidence as is case for Steve's solution. Top of bridge is visible clearly (ish). Two on right are incresing higher level of incidence i.e. looking down. Underneath of bridge then becomes visible. The third is the critical turning point, neither top or bottom are visible! QED  Excellent job Steve! Thanks very much
PS if have time, might create clearer example with points of reference behind to show the resulting angles of perspectives, or maybe best if try yourselves if not convinced
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Posted on 05/06/09 10:41:18 AM |
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Jota120
Ingenious Inventor Posts: 2615 Reply |
Re: Bridge perspective
Couple more..  |
Posted on 05/06/09 10:42:21 AM |
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Jota120
Ingenious Inventor Posts: 2615 Reply |
Re: Bridge perspective
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Posted on 05/06/09 10:47:22 AM |
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Steve Caplin
Administrator Posts: 7047 Reply |
Re: Bridge perspective
Trevor, those are really helpful examples - thank you! |
Posted on 05/06/09 11:25:57 AM |
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Deborah Morley
Makeover Magician Posts: 1319 Reply |
Re: Bridge perspective
Great Trevor, thank you. |
Posted on 09/06/09 00:37:57 AM |
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dave.cox
Marquee Master Posts: 518 Reply  |
Re: Bridge perspective
Jota, Great idea, and great examples. I thought that I would create a clearer rendition for everyone. The only change from on scene to the next is the camera angle. Dave. 
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Posted on 15/06/09 03:52:47 AM |
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dave.cox
Marquee Master Posts: 518 Reply |
Re: Bridge perspective
Thanks for your comments Steve, I thought I would try and fix this. Does this look more correct?  |
Posted on 15/06/09 4:28:42 PM |
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Steve Caplin
Administrator Posts: 7047 Reply |
Re: Bridge perspective
Yes, Dave - certainly better now the carpet is opaque. One thing about water, though, is that reflections are always at least as dark as the original: in most cases, the reflections are darker. Your reflected carpet is too bright! And look at the reflections of the trees: they're distorted by rippling. Shouldn't the carpet get the same treatment? |
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