Sceneform-android-sdk: how to show boundingbox of a node?

[scolar]

can sceneform show boundingbox lick this:

[dsternfeld7]

There currently is no debug functionality for showing the bounding box of a node. However, you can write some code to render the bounds yourself like this:

            // Create the andy and add it to the anchor.
            Node andy = new Node();
            andy.setParent(anchorNode);
            andy.setRenderable(andyRenderable);

            // Create node to display the bounds of the andy
            Node boundsNode = new Node();
            boundsNode.setParent(andy);
            MaterialFactory.makeTransparentWithColor(this, new Color(0.8f, 0.8f, 0.8f, 0.5f))
                .thenAccept(
                    material -> {
                      Box box = (Box) andyRenderable.getCollisionShape();
                      Renderable renderable =
                          ShapeFactory.makeCube(box.getSize(), box.getCenter(), material);
                      renderable.setCollisionShape(null);
                      boundsNode.setRenderable(renderable);
                    });

[dsternfeld7]

closing due to inactivity.

[RichardSantillan]

The code above is a good start!

Change the following line:
Renderable renderable = ShapeFactory.makeCube(box.getSize(), box.getCenter(), material);

• Above creates a box, masking your object. You can use the center-point and the size of the box to create each individual outline edge.

box.getSize() and box.getCenter() are Vector3(x, y, z) objects. So you can manipulate your cube into a line (or edge), then position each line accordingly (ex. new Vector3(box.getCenter().x + box.getSize().x/2, box.getCenter().y, box.getCenter().z))

• Make a boundsNode for each line (edge), then make andy the parent of all those boundNodes! Hope this helps anyone in the future!

[hshapley]

@dsternfeld7
But this relies on a renderable having a CollisionShape, and currently only Box and Sphere shapes are supported. More importantly, CollisionShapes have to be created by the developer anyway. Is there any way to get the "extents" or "size" of an unknown/arbitrary model in code?

165 seems to be wondering this as well. This is super important for many scenarios. For instance, there are many times where you want to know if the model is fully within the view of the screen or whether it goes past the edges in some way. Or, you want to leave the model's origin at its center of mass, but position it sitting on a plane as if its origin were at the 'root'.