Hello,
I am using the java3d version that is installed with the following binary:
java3d-1_3_1-windows-i586-opengl-sdk.exe
It is on windows and built on opengl.
I cannot get the CULL_NONE behavior in the PolygonAttributes to work
correctly. Here is a fragment of code I use to set up a single triangle for
drawing.
BranchGroup root = new BranchGroup ();
TransformGroup trans = new TransformGroup ();
trans.setCapability (TransformGroup.ALLOW_TRANSFORM_WRITE);
root.addChild (trans);
Shape3D shape = new Shape3D ();
TriangleArray ta = new TriangleArray (
3,
TriangleArray.COORDINATES |
TriangleArray.COLOR_3 |
TriangleArray.NORMALS
);
Point3f[] pts = new Point3f[3];
pts[0] = new Point3f (0.0f, 0.0f, 0.0f);
pts[1] = new Point3f (0.5f, 0.0f, 0.0f);
pts[2] = new Point3f (0.0f, 0.5f, 0.0f);
Color3f[] clrs = new Color3f[3];
clrs[0] = new Color3f (1.0f, 0.0f, 0.0f);
clrs[1] = new Color3f (0.0f, 1.0f, 0.0f);
clrs[2] = new Color3f (0.0f, 0.0f, 1.0f);
Vector3f[] norms = new Vector3f[3];
Vector3f tn = new Vector3f (0.0f, 0.0f, -1.0f);
norms[0] = tn;
norms[1] = tn;
norms[2] = tn;
ta.setCoordinates (0, pts);
ta.setColors (0, clrs);
ta.setNormals (0, norms);
shape.addGeometry (ta);
The triangle is drawn fine as shown here. If I switch pts[1] and pts[2],
nothing
is drawn.
The direction of the normal (1.0 or -1.0) has no effect on the behavior.
Only
the orientation of the vertices has any effect. I understand that no front
and
back culling is done by default. I also explicitly set the culling via a
PolygonAttributes
object, just in case the default was different, but it still did not work
correctly.
I have done a fair bit of OpenGL programming using the same machine as I am
using
for Java3D. In straight OpenGL calls from C++, the face culling works just
fine.
Any ideas on why this is happening?
Glenn
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