I'm a little confused about the setValidVertexCount() function inside
GeometryArray objects. What it says in the documentation is:
"This count specifies the number of vertices actually used in
rendering or other operations such as picking and collision."
I understood this to mean that if you have an array of 5 vertices but
you call setValidVertexCount(2), it will only render the first 2
vertices. Am I incorrect in my interpretation of this? I have written
several different test programs, and in all variations it renders all
the vertices in the array, not just the subset I want. If this is not
the correct way to do render a portion of a vertex array, can someone
please let me know how this can be done?
Basically, my application needs to draw a line following behind a moving
object, showing a history of where it has been. Obviously when the
application starts, it needs to be of length 0. Then, each time the
object moves (basically every frame), an additional point will be added
to the history. What I intended to do was create one array of size 1000
(the maximum number of points that this history can have). Then, each
time it moves I update the proper point in the array and tell Java3D
that the number of points in the array that it needs to render has
increased by one.
Anyway, if I am using setValidVertexCount incorrectly, or if there is
another way I can do the same thing, please let me know.
Thanks, in advance!
-- Ken
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