Realistic reflections

MR.BIG · #1 10-11-2007, 04:29 PM

Hi to everyone : )

Can someone please explane to me how to make realistic reflection in case when object doesnt have flat bottom ?
Or , we look at the object from different angle.
Like this plastic tube on the picture .......

I have tried but this is absolutely not right

AdamZx3 · #2 10-11-2007, 08:18 PM

Duplicate the object on another layer, then flip vertically, align like in the picture, then add a mask using a white to black gradient to make it fade away. Adjust the opacity to 30% or so (depending on object and background).

As as on an angle that can be tricky, depends a lot on the object and angle. I did one on a lowrider truck and you could get away with using the perspective and skew adjustments under the free transform tool, and a heathly dose of cutting pieces and cloning in the gaps...not all projects will allow for this.

Do you have an image we can see, that would help.

KR1156 · #3 10-12-2007, 07:51 AM

if you absolutely cannot re-shoot this with reflection, then try duping the masked out cylinder, flop it vertically, and use the transform mesh tool to do your as much as you can, then finish up with some liquify filter to round it out as best as possible.

try to do as little as possible in liquify, depending on your resolution, because it will tuen into whole 'nother project to replace those stretched out pixels you ended up with after liquifying it.

here's a ROUGH sketch of how it should look, somewhat.

MR.BIG · #4 10-12-2007, 04:25 PM

Thank You all for helping me out .....

I can not reshoot those objects , because they are 3D models

I will prepare the image tonight to show you what I need to do, so ...... I`ll need more help

pixelzombie · #5 10-12-2007, 05:09 PM

if they are 3d models, can't you make the reflection during the rendering?

AdamZx3 · #6 10-13-2007, 04:16 PM

Ooooh ic what you mean, I thought your pic was the desired end result

Your cylinder needs some shadowing to make it look 3d.

I agree with pixelzombie, it would be much better to do it in your 3D app. If you cant get it to reflect on a 3d plane then try and mirror it on the x or y axis and pull it down on the z axis until the bottoms are touching. Add a different shader and reduce the opacity so it fades away...or do that in photoshop after if you want.

**edit
The mesh might show through if you reduce the transparency so you see through to the other side...I forget how to make it not render anything that might have polygons facing the camera, its been a few years since ive used 3dsmax or maya.

MR.BIG · #7 10-14-2007, 03:21 AM

Thank you all .... again ....... first I`ll try to render reflections in Maya (but I`m not that good in 3D apl. )

This is the almost final image ........ and these reflections are no good at all ...... tonight I`ll try to make them by yours advices ...

I must pull this because I have whole series of ads that I need to do with these plastic containers..

amica999 · #8 10-14-2007, 06:16 AM

There is a nice video on http://www.russellbrown.com/tips_tech.html on this topic.

KR1156 · #9 10-14-2007, 08:52 AM

why don't you upload 1 of those containers, by itself, and we'll take a stab at it and see if we can help you with it, that's if you can't do it in your 3-d program.

Cassidy · #10 10-14-2007, 09:19 AM

It looks like it's a perspective issue to me

Dave.Cox · #11 10-14-2007, 03:33 PM

The problem that I see with the reflection in your image is this. You have copied and inverted the three images as one. The left and right containers are set back and behind the middle container. You should separate the portions of the image out, and move them up so that the images each start their respective reflections and the base of the container.

Markzebra · #12 10-14-2007, 04:27 PM

Displacement maps - when a cylindrical object like this has been shot from an angle you need to make the reflection follow the contours of the shape above. There is only one way I've discovered to do this- you need to make a displacement map using a reflected gradient. Then go into the displace filter and choose a vertical scale, taking horizontal to 0. I've had to do this for many Packshot items before.

MR.BIG · #13 10-14-2007, 05:11 PM

Dave.Cox
This image is like that (reflections) until I solve the problem, I did it just to see what is going on ...

Markzebra
I`ll try you way right now ..... thanks

MR.BIG · #14 10-14-2007, 05:29 PM

I`m doing something wrong .... Markzebra , can you give more instructions please

Dave.Cox · #15 10-14-2007, 10:13 PM

My mistake. Is this what you are looking for?

copy the image below the original, flip vertical, and enter free transform warp mode and select the arch warp. Adjust to fit. Mask the edge to the original to fit.