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Tutorials 3D Graphics Tutorials Creating a Lantern

# Creating a Lantern

Mgfx.net Tutorials Sep 16, 2005

Lower Base Section

Okay all the basic 2D shapes are finished. Picture 21 shows all the layers together at this point.

Picture 21: All the layers together (Click to enlarge)

Now we’re going to lathe these one by one, so lets start out with the Base Section. Switch to Layer 1 and activate the Lathe Tool by pressing “Shift+L” on the keyboard. Bring up the Numeric Panel by pressing “n”. We’re only going to change the amount of Sides here, so set it to “16” and make sure the axis is set to Y, leave the rest and then close down the Numeric Panel. Deactivate the Lathe Tool now to perform the operation.

The kerosene is stored in this part of the Lantern, and we need to have some sort of opening on it where you fill it up. The cork itself will be created later, but we will put a small bump in the mesh to simulate the opening. We will do this using the Smooth Shift tool, but first we need to rotate the Base section a bit.

Activate the Rotate Tool and bring up the Numeric Panel. Set the Axis to Y and keep all the centre values to 0. So how much should we rotate this then? Well, we want the polygon segments to line up straight with the grid pattern sort of. Picture 22 shows the Base Section just after I Lathed it, and as you can see the point segments are lining up with the grid pattern.

Picture 22: Base Section just after the Lathe Tool

I have marked one of the point segments in picture 22, and we want the polygon segments to face this way instead. In the Numeric Panel of the Rotate Tool, enter this in the Angle field:

360/16

That’s right, type exactly what I wrote above, Lightwave will do the math. Why do I divide 360 with 16 then? Well, the Base Section was Lathed 360 Degrees, and we used 16 Sides, and thereby if we divide 360 with 16 we get exactly how many degrees there is between each segment. So enter 360/16 and press enter, you will get 22,5 degrees. But we are not done with this, now we have the amount of degrees between each segment, but we want to rotate the Base Section half a segment. If we were to rotate the Base Section 22,5 degrees the change wouldn’t be noticeable.

So we have to divide 22,5 in 2, so type this in the Angle field:

22,5/2

Lightwave will now produce 11,25 degrees, and this is the number we were after. Press Apply now to rotate the Base Section, and afterwards it should look like picture 23.

Picture 23: Base Section rotated

As you can see now, the Polygon segment is facing the centre line perfectly; I’ve marked one of the polygons segments with red in picture 23.

Now we are going to select 4 of these polygons to create the bump in the mesh. Select the 4 polygons shown in picture 24.

Picture 24: Select these polygons (Click to enlarge)

You can easiest do this by just clicking on the mesh in the Perspective View.

With these 4 polygons selected, activate the Smooth Shift tool by pressing “Shift+F” on the keyboard. Then just right click in any of the Viewports and the points will be duplicated at this place. Keep the polygons selected and activate the Stretch Tool by pressing “h” on the keyboard. Press “Shift+A” now to fit the selection in the Viewports, then place the mouse pointer in the centre of the selection in Top View and drag it inwards a bit, like in picture 25.

Picture 25: Stretch the polygons inwards (Click to enlarge)

Keep the polygons selected and activate the Move Tool by pressing “t” on the keyboard. Move the selection downwards and to the left in the Back View, like in picture 26.

Picture 26: Move the selection down and to the left in the Back View

Keep the polygons selected and activate the Smooth Shift Tool again, then just right click in any of the Viewports to duplicate the points once more. Now you can deselect the polygons, the work on the Base Section is done. Press Tab now to activate Metanurbs/Subpatches, then open up the Options Panel by pressing “o” on the keyboard. Set the Patch Division to 4 and click OK. Picture 27 shows a few angles of my Lower Base Section.

Picture 27: The finished Base Section (Click to enlarge)

Open up the Change Surface Panel by pressing “q” on the keyboard, then create a new surface called “Metal” and Click OK.

Upper Base Section

Switch to Layer 2 and press “a” on the keyboard to fit the 2D shape in the Viewports. This section will later on have a small knob to control the kerosene flow, and thereby we need to make a small hole in one of the sides, but first of all, lets Lathe it.

With nothing selected, activate the Lathe Tool and bring up the Numeric Panel. We are going to use 24 Sides for this section, so enter that and make sure the axis is set to Y, then close down the Numeric Panel. Deactivate the Lathe Tool now to perform the operation.

We are going to rotate this section to, but we can’t use the degree amount we used on the last section since we used 24 sides for this one. The idea is the same though, so just activate the Rotate Tool, bring up the Numeric Panel and enter 360/24/2 in the Angle field. The result should be 7,5 degrees so just click apply to rotate the mesh. Select the polygon shown in picture 28, easiest way is by just clicking on it in the perspective view.

Picture 28: Select this polygon (Click to enlarge)

Activate the Smooth Shift tool and right click somewhere in one of the Viewports, then activate the Stretch tool and place the mouse pointer in the centre of the polygon in the Right Viewport (Bottom Right Viewport).

Stretch the polygon a bit inwards like in picture 29.

Picture 29: Stretch the polygon inwards

Now activate the Move Tool and move the selected polygon towards the negative side on the X-axis, like in picture 30.

Picture 30: Move the selected polygon (Click to enlarge)

When you have moved it, activate the Smooth Shift Tool again and right click in any of the Viewports to duplicate the points. Keep the polygon selected and activate the Move Tool again, then move it twice as much as last time, again towards the negative X axis. When you moved it, hit delete on the keyboard to delete the selected polygon.

Press Tab now to convert this section to Metanurbs/Subpatches. Picture 31 shows 2 angles of my Upper Base Section.

Picture 31: The Upper Base Section (Click to enlarge)

Now this section should lie directly on top of the Lower Base Section, so we need to move it a bit. Activate the Move Tool and move this upwards about 3cm on the Y-axis. You can put Layer 1 in the background to see that it’s placed in the right spot. When you’ve moved it, activate the Rotate Tool and bring up the Numeric Panel. Enter –25 degrees and set the axis to Y, keep all the centre values at 0 and click Apply. If you view Layer 1 and 2 together now they should look something like picture 32.

Picture 32: Layer 1 and 2 together (Click to enlarge)

Layer 2 should also have the Metal Surface, so bring up the Change Surface Panel and select the Metal surface there, then click OK.