Path: AerospaceUtils/CAD
% Finds the visible surfaces given a vertex and face list.
Computes surface shadowing ("hidden surface removal") using backface
culling. Uses the infinite line method for determining whether a point is
within a polygon. The ordering of vertices is consistent with Polygon.m.
Includes a built-in demo.
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Form:
[aV, cV, area] = HSRCAD( v, f, z, n, showScans )
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Inputs
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v (:,3) Vertex list
f (:,3) Face list
z (3,1) Unit vector to the source
n (1,1) Number of scan lines (default 20)
showScans (1,1) Any argument will cause a plot to be drawn
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Outputs
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aV (1,:) Visible area per face
cV (3,:) Centroid for each face
area (n,n) Matrix showing the ID of the visible surface
0 means no surface is visible
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Reference: Hill, F.S. Jr., Computer Graphics, p. 243.
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Common: Graphics/XLabelS Common: Graphics/YLabelS Common: Graphics/ZLabelS Math: Linear/Cross Math: Linear/Unit
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