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genshell (1)
NAME
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genshell - generate a RADIANCE description of a membrane |
SYNOPSIS
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genshell mat name show_type radius xl yl m n type
(params...) |
DESCRIPTION
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Genshell produces a RADIANCE scene description of a
membrane. This function allows to get the minimal surface of
a shell (like a soap bubble). |
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The algorithm for the calculation of the geometry is based
on the master research developed by prof. Edna Shaviv in
Cornell University. |
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So far are defined five types of membranes, according to
different mathematical functions. According to each function
there are a number of parameters to give. There is the
possibility of defining the membrane either as a continuous
surface, or as a collection of pipes, giving as a result a
wire frame membrane. The surfaces that make up the membrane
will be modified by mat and their identifiers will begin
with name. |
OPTIONS
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show_type : s - Surfaces, w - wire frame |
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radius : When show_type is w (wire frame) this option must
get a value greater than 0. In show_type s (surface) radius
value is irrelevant, however you must give any
(0). |
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xl yl : Lenght and wide of the shell |
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m n : Number of divisions of the shell (Recomm. an even No.,
and that m = n) |
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Types are : P, E, C, L, T |
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Parameters according to type: |
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P (parabole) :h1 h2 h3 h4 (Heights in the middle of each
side of the shell |
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C (circle) : no arguments L (linear) : ang1 ang2
(Inclination angles) |
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T (triangle) : ang1 ang2 ang3 ang (Inclination angles for
each side of the shell) |
EXAMPLE
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To create a wire frame Parabolic membrane of 8 units and 10
divisions each side, and with one side of maximal height in
the middle of 5 units and also its opposite (m direction
--> x) and the third and fourth sides of 10 units height
(n direction --> y) looks like this (notice that the
radius value is 0.04): |
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genshell red_plastic sh1 w 0.04 8 8 10 10 p 5 5 10
10 |
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For the same membrane, but with show_type surface, the
example will look: |
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genshell red_plastic sh1 s 0 8 8 10 10 p 5 5 10
10 |
AUTHOR
BUGS
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The data input must be entered in the order specifyed in the
synopsis. |
SEE ALSO
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