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Yoshiki Ohshima wrote:
<blockquote cite="mid:uskm9j6jy.wl%25yoshiki@vpri.org" type="cite">
<pre wrap="">At Fri, 20 Feb 2009 03:11:20 -0800 (PST),
Ang Beepeng wrote:
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I'm facing problem to pass a float array over to C, to create a plugin.
Previously, I use variableWordSubclass: to create a class to store floats,
in an array. It works fine, as floats are stored as words.
Now that I need to have an instance variable, I use variableSubclass: to
store floats. It seems like floats are being stored as object in the array
this time. The VM crashes when I try to use to same method to access to the
float array.
</pre>
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<pre wrap=""><!---->
To get a Float object and use the value in C, use #floatValueOf:.
Look at the senders of the method for examples.
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<br>
I'm not sure that this is the right thing, since each Float represents
a double-precision floating point number, and the contents of
FloatArray are single-precision.<br>
<br>
I would look at the primitives in CroquetPlugin, which you can find in
an OpenCroquet or Cobalt image. For example,
#primitiveTransformVector3 transforms a 3-element vector by a 4x4
matrix. Matrix4x4 and Vector3 are both subclasses of FloatArray.<br>
<br>
This might still not be answering your question directly (since you are
talking about adding inst-vars to a 'variable-word' class). My
suggestion would be add another inst-var to hold a separate FloatArray
object which contains your floating point data.<br>
<br>
Josh<br>
<br>
<br>
<blockquote cite="mid:uskm9j6jy.wl%25yoshiki@vpri.org" type="cite">
<pre wrap="">
-- Yoshiki
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