I have some code that generates a 'rounded stick' like object I use for creating molecular stick models. The GeometryInfo class interests me and looks like it could save me a lot of work. That is if I could get it to work.
Case 1:
def createNormals(self): gi = GeometryInfo(GeometryInfo.TRIANGLE_ARRAY| LineArray.COLOR_3)
The prmitive sent to GeometryInfo is one of the five primitives listed in the javadoc (POLYGON_ARRAY, QUAD_ARRAY, TRIANGLE_ARRAY, TRIANGLE_FAN_ARRAY, or TRIANGLE_STRIP_ARRAY). Why are you or'ring GeometryInfo.TRIANGLE_ARRAY with LineArray.COLOR_3? That's wrong.
GeometryInfo will know that you have colors when you set the colors using setColors(). You do not need to send a flag to the constructor to inform it that you will be using colors. GeometryInfo was designed to be more flexible than GeometryArray, and this is one example of how I tried to achieve that.
gi.setCoordinates(self.verts) nm = NormalGenerator()
NormalGenerator nm = new NormalGenerator();
nm.generateNormals(gi) si = Stripifier()
Stripifier si = new Stripifier();
si.stripify(gi) return gi.getGeometryArray(1,0,0)
return gi.getGeometryArray(true, false, false);
Result:
java.lang.IllegalArgumentException: StripCounts inconsistent with primitive at com.sun.j3d.utils.geometry.GeometryInfo.checkForBadData
This error means that you have set stripCounts on a primitive that doesn't require it, or vice-versa. TRIANGLE_ARRAY and QUAD_ARRAY don't require stripCounts, the other three primitive types do.
GeometryInfo is confused about the primitive because you sent the LineArray.COLOR_3 flag to the constructor. LineArray.COLOR_3 is 4 and GeometryInfo.TRIANGLE_ARRAY is 1 so you are sending 1 | 4 = 5 to the constructor. This corresponds to GeometryInfo.POLYGON_ARRAY so GeometryInfo is expecting polygons. This is why it needs a stripCounts arry, which you didn't set, hence the error. (To find these values, in the javadoc, click on the constant and then click on "See Also: Constant Field Values." See here:
http://hendrix.lems.brown.edu/~arw/online-docs/java3d-1.3.0-docs/constant-values.html
Yet it works if I create a GeometryArray.TRIANGLE_ARRAY with the same data it works.
Huh ?
The primitive type constants for GeometryInfo are separate from those for GeometryArray. You need to use the GeometryInfo primitive constants for GeometryInfos and the GeometryArray constants for GeometryArrays.
-Paul Pantera Chief Architect, PresidioLabs, Inc. 1-650-766-1517
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