Reflections can take a great deal of time to render, due to
the way light bounces around, which the program has to calculate
for every bounce! A cheap way to do reflections is to use a "reflection
map" loaded into the reflection channel of the material. This
is a nice technique for objects which aren't going to be up close
or need to show perfect reflections.
In Vue, the easiest way to do this is to:
1) Position a camera inside the object needing reflection maps.
2) Hide the object from the renderer
3) Render out a normal or panoramic image from the object close
to the ground. Panoramic is best since it will give full round view,
when using panormaic format, render twice as wide, as high, for
example, 800x400 pixel size. If the object is up in the air, a spherical
render maybe needed instead.
4) you don't need huge map sizes as these are just reflections and
are not for up close items.
5) then load the map in the objects reflection channel in material
editor. Add some blurring if wish.
6) Un-hide object from renderer! ;)
7) Render as normal.
8) You may need to adjust the U and V offset of the reflection map
for best effect, I find from tests so far U offset of 0.5 tends
to be needed.
Other things to consider are using an HDR, or panoramic of the
entire scene and set as default reflection map, just remember, that
those won't be as good for individual items since the camera for
HDR may be very different in position from the object itself or
final render camera.
The over all effect is not as good as true reflections but takes
a lot less time to render, if there's a lot of reflections in your
Alternatively, render out a panorama of the sky and apply that as
a reflection map.
Due to current processing power I don't find this too much of an
issue now, though it MAYBE an idea for lake or sea surface scenes?
SEVEN: FINAL RENDER
Note it's vertically off, I should have rendered with the camera
lower to the ground (doh!), also, I had to adjust the U and V offset
of the map
Since the object is a cylidner, it distorts the map, even when cylindrical
mnapping is applied. But it's fine for other objects as background