Creating a line inside a shape

[sarimmehdi]

I want to show the axes of an ellipsoid. This is how I create the axis material:

// completable future for creating axes of ellpsoid
// ArModelCreationHelper.java
Color axisColor = new Color(android.graphics.Color.rgb(255, 255, 255));
MaterialFactory.makeOpaqueWithColor(context, axisColor)
        .thenAccept(
                material -> {
                    axisRenderable = ShapeFactory
                            .makeCube(new Vector3(1, 1, 1),
                                    new Vector3(0, 0, 0),
                                    material);
                    axisRenderable.setShadowCaster(false);
                    axisRenderable.setShadowReceiver(false);
                });

This is how I create my ellipsoid:

// create the ellipsoid node
// ellipsoid is a class object from earlier
Node ellipsoidNode = new Node();
ellipsoidNode.setName(ellipsoid.getEllipsoidId());
ellipsoidNode.setRenderable(arModelCreationHelper
        .getEllipsoidRenderable());
ellipsoidNode.setLocalPosition(localPos);   // localPos defines the position of my ellipsoid in the reference frame of an anchor
ellipsoidNode.setLocalRotation(localRot);   // localRot defines the rotation of my ellipsoid in the reference frame of an anchor
ellipsoidNode.setWorldScale(axisLengths);
ellipsoidNode.setParent(anchorNode);

And this is how I am creating the three axes:

// create the axes of the ellipsoid node
List<Color> axesColors = Arrays.asList(
        new Color(android.graphics.Color.rgb(255, 0, 0)),
        new Color(android.graphics.Color.rgb(0, 0, 255)),
        new Color(android.graphics.Color.rgb(0, 255, 0))
);
// axesLengths defines the lengths of the three axes of my ellipsoid
List<Vector3> axesLengths = Arrays.asList(
        new Vector3(axisLengths.x, 0.01f, 0.01f),
        new Vector3(0.01f, axisLengths.y, 0.01f),
        new Vector3(0.01f, 0.01f, axisLengths.z)
);
List<Vector3> lookDirs = Arrays.asList(
        new Vector3(1, 0, 0),
        new Vector3(0, 1, 0),
        new Vector3(0, 0, 1)
);

Iterator<Color> colorsIt = axesColors.iterator();
Iterator<Vector3> lengthsIt = axesLengths.iterator();
Iterator<Vector3> lookIt = lookDirs.iterator();
while(colorsIt.hasNext() && lengthsIt.hasNext() && lookIt.hasNext()) {
    Color axisColor = colorsIt.next();
    Vector3 axisLength = lengthsIt.next();
    Vector3 lookDir = lookIt.next();
    Node axisNode = new Node();
    axisNode.setRenderable(arModelCreationHelper.getAxisRenderable());
    axisNode.setLookDirection(lookDir);
    axisNode.setLocalPosition(new Vector3(0, 0, 0));
    axisNode.setWorldScale(axisLength);
    axisNode.setParent(ellipsoidNode);
}

But I get a very small cube in the middle of the ellipsoid that is always facing the same direction

[sarimmehdi]

Okay, I don't know what's going on but if I use this in the above code:

List<Vector3> axesLengths = Arrays.asList(
                        new Vector3(1, 0.01f, 0.01f),
                        new Vector3(0.01f, 1, 0.01f),
                        new Vector3(0.01f, 0.01f, 1)
                );

and remove the lookDirs and lookIt entirely, I am able to get proper axes. Is there a crucial concept here regarding Sceneform that I do not understand?

[ThomasGorisse]

Please use discussion for this.