A point to note, when building
houses, vehicles and other 3d models, is that many 3d apps
cannot assign materials to surfaces/polygons, they can only
assign materials to discrete, seperate objects!
What this means is, that say in Vue, I import
a building, and it's main walls are all one piece...I cannot
assign different materials to each wall surface! So I could
not apply a different material to say, external, and the internal
walls. This prevents a lot of precision in rendering.
So, when you make models, and go to export them,
split off surfaces and objects, and give them seperate materials,
so you can then later on chose how to assign materials! :) |
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EXAMPLE: MAKING A WALL
IN RHINO
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Here, I am making the wall of a ship, in Rhino,
note the doorway. The problem is, that the "L"
shaped wall, if exported as one solid mesh, cannot have
a different material on each side of the right angle wall.
I don't want to split it ALL up into dozens of surfaces,
I just wish to split it into 2 main walls, for ease of use.
So, I make a cutting object, a rectangular
surface, made from an extruded curve. The curve is made
by a line from the points of the corner, but then I add
extra lengths to inside and outside of the curve, to make
sure the cutter works (important tip in such things, as
often splits and booleans fail because the cutter doesn't
go right through to the other side)
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Now, I COPY the wall section, so
I have original item avialable, you'll see why.
I Boolean (Subtraction) the original angled wall using the
surface. Since booleaninng relies on the "Direction of
normals" of the cutter, it removes the area closest to
you. So now I have just one side of the wall, as I require. |
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| See, this shows the "Direction"
of the cutting object: items on the side of the arrow will
be left, the rest will be removed. |
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Next, I PASTE in the copy of the
original item.
Then I flip the direction of the Normals of the cutter surface,
using "Dir" command. |
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I then boolean (Subtraction) the
copied wall. here you can see the result, selected and thus
highlighted.
I now have two pieces of wall, that I can individually UV
map and assign materials too :) |
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