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<p>Here the 3D object (in 3D software) captured with the camera (in 3D software) changed position in the xyz space (in 3D software).</p><div></div>

<p>Photo Cut.</p><div></div>

<p>Real object.</p><div></div>

<p>Real object, captured with real camera in real space.</p>

<p>Here the real object captured with the real camera changed position in the real space.</p>

<p>Not only the background can change dynamically but also the foreground (independently).</p>

<p>Image #7</p><div></div>

<p>Image #6</p><div></div>

<p>Image #5</p><div></div>

<p>Image #4</p><div></div>

<p>Image #3</p><div></div>

<p>You can see the real power of this technique in complicated and dynamic environments. See the following images that could be frames of a small video.<br>

Image #2</p><div></div>

<p>Here is a screen capture of Blender 3D software with the 3D View Window (up left), the Outliner Window (up right) and the Buttons Window (down).</p><div></div>

<p>Here the "Only Cast" is ON.</p><div></div>

<p>In Blender 3D software, in Buttons Window, in Shading, under Links and Pipeline, under Render Pipeline there is the option "Only Cast". Here the "Only Cast" is OFF.</p><div></div>

<p>Thank you for nice words.<br>

The "cast only shadows" is an option for a 3D object in 3D environment not in 2D image processing software. So you need a 3D software to create and render 3D objects.<br>

First create the 3D (with a 3D software), then render the 3D (with a 3D software) in a file format that preserves transparency and then process this file (with a 2D image processing software).<br>

A nice 3D software you can find here: <a href="http://www.blender.org/">http://www.blender.org/</a> <br>

I will try to make some basic tutorials for Blender 3D here in Photo.net.</p>

<p>It is important:<br>

The points of view in the photo and in the 3D to be (nearly) the same.<br>

The light source in the photo and the 3D to be in the same point (nearly) and to have the same (nearly) parameters.<br>

In this example things are rather simple but there cases with many light sources, with semi-transparent objects (half-full bottles of liquids) and with many frames (animated montages).<br>

I use this technique in my work: "Andromeda dream" and others.<br>

I hope you find this interesting.</p>

<p>And I make the 3D object cast only shadows (it is invisible but it is casting normal shadows)</p><div></div>

<p>Now I create a similar 3D object:</p><div></div>

<p>Photo cut:</p><div></div>

<p>Here is the photo of the object:</p><div></div>

<p>Here is the 3D environment:</p><div></div>

<p> For those who like creative photomontage the technique of casting only shadows may be interesting and may help you.<br>

To integrate a photo of an object in a complicated 3D environment you need accurate shaddows.<br>

You may create a 3D object similar to the object in the photo (that you want to integrate) and make it cast only shadows (it will remain invisible with visible only it's shadows).<br>

Then in the position of the invisible 3D object you paste the (cut and copied) photo.</p><div></div>

<p>I do not like the idea of anonymous feedback. If a person (with full real name and surename) have an opinion sould / could write it (politely) and sign it. I do not have problem with balanced critiques (I welcome them) but I do not welcome unbalanced negative comments and especially I find unacceptable the behaviour of some members that write negative comments about models in photos.<br />Stamoulis Theodorikas.</p>

<p>"...the above lenses are what i WANT to buy."<br>

In my opinion do as you WANT. If in future you buy full frame Canon then think again.</p>