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| STEP
1 - CREATING THE GLASS, PT I |
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First
of all create a sphere. Enlarge it and move it up off the
ground. Click on the A button and select positive.
Duplicate the sphere (Ctrl - D) and reduce the duplicate in
size slightly. The difference in size is the thickness of
the glass. Click on the A button and select negative. Select
both spheres and group them together (G). Click on the A button
and select positive for the group. You now have a hollow sphere
although you can't tell by looking at it.
Figure 1
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| STEP
2 - CREATING THE GLASS, PT II |
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Create
a cube. Enlarge it so that it completely encloses the hollow
sphere when viewed from the top. Reduce the height of the
cube and move it vertically to the position shown. I'm using
the view from the right in Fig2. Click on the A button and
select negative. Group the cube and the hollow sphere together.
Click on the A button and select positive.
Figure 2
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| STEP
3 - CREATING THE GLASS, PT III |
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Apply
a glass material (I used crystal) and render, it should look
like Figure 3.
Figure 3
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| STEP
4 - CREATING THE BREAK |
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Create
a rock, not just any rock, try to get one that's roundish
rather than one of the more rectangular ones. Delete and recreate
until you find a suitable one. Raise the rock and position
it to intersect the glass bowl rim. Use side, front and top
views to help in the positioning.
Figure 4
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The
rock should have the same glass material applied as the bowl.
With the rock selected, click on the A button and select negative.
Group the glass rock with the bowl group. The resultant render
is shown in Fig5. Attach a glass cylinder for a stem and make
a base from a flattened sphere with the bottom cut off by
subtracting a cube. There you have your broken glass.
Figure 5
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| STEP
6 - CREATING THE MISSING PIECE |
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But
wait - there's more and this is the really neat bit. Move
the whole group (rock and bowl) to one side. While it's selected
press Ctrl -D to duplicate the lot. (Cmd - D on the Mac).
Move the duplicate to the left, to clear the original group.
Click on U to ungroup the rock from the bowl. With the rock
selected, click on the A button and select Intersect. Regroup
the rock and the bowl. There is the missing piece.
Figure 6
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| STEP
7 - MOVING THE GLASS PIECE |
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By
using the shift key and rotating 90 degrees or 270 depending
which way you go and then lowering the group you can position
the broken piece on the ground plane where it fell. Use a
side view and zoom to position the curve of the outer sphere
on the plane. A subsequent render is shown in Figure 8.
Figure 7
Figure 8
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| STEP
8 - CREATING A GLASS CRACK |
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But
wait there's more. This broken piece of glass is an exact
fit for the gap in the glass bowl. So if you just want a cracked
glass just select both groups and hit the centre align button.
The piece will be fitted into the gap.
Figure 9
You must do this before the previous rotation or it won't
work. Notice that the crack is visible in the projected patch
of light. Play with the lighting position to get the crack
to sparkle.
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BreBru.com