motion blur

LE FLOU FOCAL AVEC Z-BLUR Focal Blur. Translaton of a French Tut I found.

The purpose of the FOCAL BLUR WITH Z-BLUR This small teachware is not to show you all the possibilities offered by Z-blur, but just to make knowledge with some guiding principles. It was conceived by Strubi http://honk.physic.uni-konstanz.de/~strubi/3d/index.html/ and you can download it for various systems on http://www.cs.umn.edu/~mein/blender/plugins/ . Z-blur is excellent small a plugin pourBlender, it is used in the editor of sequence, but we will verons that further. The utility of this plugin is that it makes it possible to make the development, a little like a camera. If you want to add a little realism to your images, Z-blur is very indicated. This teachware is in two parts;
1st ==> part developed on the background,

2nd ==> part developed on the foreground, by using the X-ray button.

Description of some buttons: Blursize: to regulate the ray of blur. The more the angle, is made significant the more takes time. With regulated Blursize to 30.00, you will have an image almost entirely fuzzy (that also depends on your scene). Zmin: this value simulates the obturator of a camera. The values spread out this way 0.0

1st ==> PART DEVELOPED ON the ARRIERE-PLAN

To make this teachware, I utlilisé the last scene which I carried out with Blender, but you can take any; it is enough to have an object in the foreground and a decoration with the background.
(I translated this and don't have the .blend.)

Initially create a scene in Blender, in this scene, take care to place your camera well (to select it in mode object --> touches keyboard and clic right, after this, it must be displayed pink fluo). Also take care to notch it ShowLimits button in this menu (that will enable you to see its range), and to finish, to regulate in this same finely there outdistance of ClipSta to your suitability --> (fig.1). Increase the value of ClipSta until it is more close possible object of the foreground (fig.2). which; it is enough to have an object in the foreground and a decoration with the background.

Caution: I repeat myself but it is very significant; it is necessary to regulate the value of ClipSta so that the yellow point (camera selected) is not too far away from the object of the foreground. The yellow point is shown with an arrow violet and the camera is surrounded out of orange in the fig.2 and 3, which are respectively, a sight above and a side view. see fig 2,3.

One now will pass in the editor of sequence and will import our scene; with this intention, go in top on the left of your screen, you will find a small point white, which gives access to a menu, cliquez on the white point and selectionnez " screen.002 " (fig.src). see fig.src.

Once arrived in the sequence editor, you will import your creation; SHIFT+A on the keyboard, selectionnez Scene in finely and completely bring it on the left (using the key G of the keyboard), so that it touches the green line (fig.4). Look at the yellow arrow. see fig 4.

Then remade SHIFT+A on the keyboard and selectionnez Plugin in the menu, will seek Z-blur (dll extension for Windows, so for Linux) on your hard disk. Selectionné Z-blur once, type N on the keyboard, to have access to the adjustments. You see that the development automatic is engaged (Autofocus), look at the adjustments (fig.5) and note the result on the image (fig.6). see fig 5,6.

The difference with the original image, without Z-blur (fig.7). see fig 7.

The FOCAL BLUR WITH Z-BLUR (continuation of the 1st part) You can give a little imagination to your images, by regulating Sigma with a value higher than 0.00 (fig.8), the result (fig.9). see fig 8,9.

If you want to see the changes of your tests with Blursize, Zmin, Focus and Sigma, directly in your returned, actuate the DoSequence button, look at it (fig.10). Press on the key F12 to make the returned first, support then on the DoSequence button, and to finish, again on F12. see fig 10.

Specified: you should never put the Focus button at 1.00, if not you will have an error; your screen will become red.

2nd ==> PART DEVELOPED ON the FOREGROUND:

For this second part, I continue the experimentation of Z-blur, with the same scene, by adding an object; I have create rambarde to simulate the scene through the barraux ones. The development was done initially on rambarde (in the foreground). In the second time, we will return to a debugging on the background, thanks to the Focus button. To start, in addition to the fact of creating rambarde and of placing it in front of the house, I moved back the camera and I changed the value of ClipSta (fig.11).

We now will proceed differently of the first part, it will be necessary to add a " Empty " and to put it exactly with the same co-ordinates as the camera, and then that we make of this " Empty ", the relative of camera. If the cursor 3D is not with the site of the camera, selects the known as camera and makes SHIFT+S and cliquez left on " Curs -- >Sel " in the menu which appears. This made, type on the key spaces keyboard (to actuate Toolbox) and choose ADD-Empty in the menu. Select your camera of a clic right (it must be displayed in object mode, i.e. pink fluo), then, while maintaining the key SHIFT inserted, select the "Empty " (always of a clic right) and type on the keys CTRL+P, a menu is displayed then, you must confirm while typing on key ENTREE of the keyboard. To move or make swivel the camera, you must select the "Empty ", the camera will follow the movement. Here Here two screen printings, a sight of top (fig.12) and a front view (fig.13). see fig 12,13.

Turn over, as in the first part, the editor of sequence (fig.src) see fig.src. Once in the editor, (to be supposed that you retained how to import the scene, and Z-blur --> like explained in the first part) press on N, to have access again to the Blursize parameters, Zmin, X-ray.... This made, in this same finely déselectionnez Autofocus. As you see it Zmin was put at 0.000 and Focus with 0.500, (in this case Blursize allows to regulate the intensity of blur), look at it (fig.14) and the result (fig.15). see fig.14,15.

You see, with these adjustments, the development is done on rambarde, i.e. in the foreground. Maintaining the development will be done on the background; Autofocus is always déselectionné, the value of Zmin remained the same one (0.000), but Focus is now to 0.765 (fig.16), look at what that gives (fig.17). see fig. 17.

You note that one can vary the development between the foreground and the background, and vice versa, in simply leaving the value of Zmin with 0.000 and by varying that of X-ray. One could make the following report: X-ray regulated between 0 and 0.500, makes the development on the foreground and Focus regulated between 0.500 and 1.000, made the development on the background, but that depends on the type of scene (of the distance between the camera and the object immediate, of the value of ClipSta...). X-ray must be regulated with precision, if one wishes to obtain what one wants. When you add an object, or move the camera..., it is necessary to actuate the Clear button in the editor of sequence, that makes it possible to refresh the window of returned, and the changes take effect immediately (fig.18). Recall: for one made time real, i.e. F12, do not forget to engage the DoSequence button. see fig. 18. Well you'll get the picture In this teachware, it is fixed question only of image, animation with Z-blur, will undoubtedly be the ocassion of one next tutorial.

transation by.webby webb. thanks to: Angelo.