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Quarter-tubes (QT)
· When it comes to medelling, quartered and regular tubes have a lot in common. For both shapes you have to determine the drawing viewport first, both have an outer and inner radius and they can only be created with the mouse (though portions of the parameters can be altered later in the manual setup). Accomplishing the case of the clock top-down, we will begin with the upper two 1/4-tubes (the RED parts in the image on the previous page). · After selecting the command »Objects« | »1/4 tube« and choosing the front-view as the windows to draw in, you can determine the outer radius of the QT with the mouse (try somthing around[3.0]). As known from drawing tubes, you can now set the inner radius, which should be [2.5]. We now have the lower left quarter of a full tube, that we have to align. · The first step in this task is to translate the QT to the right. Align the QT, so that the line of the QTs inner radius continues the curve, that is formed by the outline of the top-tubes outer radius. You should use the zoom- feature of POVLAB, to align the two shapes precisely. The last procedure for this shape is to set the depth- value to [3.0]. · For the QT on the left side, we will copy the first QT and »mirror« it with the command »modify« | »mirror«. NOTE: before you perform this command, you should press the TAB-key until POVLAB indicates, that there is only the horizontal morroring availiable (the mouse-cursor will then show two arrows pointing to the left and to the right). |
· Finally we need the last two QTs, that accomplish the curve of the case. Construct one with an outer radius of [1.50] and an inner radius of [1.00], rotate it and align it to one of the QTs we already have. NOTE: if you have problems with the alignment, then take a look at the values in the manual-setup-dialog. This can help to eliminate small deviations in the scale-, rotate- or translate-vectors. Last but not least, you can copy the aligned QT to the other side of the case (do not forget, to scale the Z-value of both QTs to [3.0]).
· That's it for the curved parts, the rest of the case is up to you, since there are only some boxes and cylinders to add. If you want to take a close look at the finished case, then click here to download the scene-file (please read the file »textures.txt«, that is included in this archive). Other objects in the »Objects«-menu
· Combined with other drawing primitives you can create useful and interesting shapes like a chain (see picture above). (continued) |
| Chapter B/Page 9 | 
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Mail to webmaster:
support@povlab.org This page was last modified on: 1996-08-02 |
Mail to the author of the POVLAB-Tutorial:
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