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thespivey avatar thespivey commented on June 1, 2024

Here is a quick example of an MRE that creates 2 parent nodes ("A" and "B") and 100 child nodes, reparented from A to B in this fashion, and labels each of those children with its parentId value. Though all of the children are parented to B and aligned as expected, their text reveals the defect as a mix of "My parent is A" and "My parent is B".

app.ts:

import * as MRE from '@microsoft/mixed-reality-extension-sdk';

export default class Repro {

	constructor(private context: MRE.Context, private baseUrl: string) {
		context.onStarted(async () => {

			const a = MRE.Actor.Create(context, {
				actor: {
					name: 'A',
					transform: {
						app: { position: { x: -0.5, y: 0, z: 0 } }
					},
					text: {
						contents: "A",
						height: 0.3
					}
				}
			});
			await a.created();

			const b = MRE.Actor.Create(context, {
				actor: {
					name: 'B',
					transform: {
						app: { position: { x: 0.5, y: 0, z: 0 } }
					},
					text: {
						contents: "B",
						height: 0.3
					}
				}
			});
			await b.created();


			const nodes: MRE.Actor[] = [];

			setInterval(() => {
				nodes.forEach(node => {
					node.text.contents = "My parent is " + node.parent.name
				});
			}, 0);

			for (let i=0; i<100; i++) {
				const node = MRE.Actor.Create(context, {
					actor: {
						name: 'Test Node ' + i,
						parentId: a.id,
						transform: {
							local: { position: { x: 0, y: -0.5 * (i + 1), z: 0 } }
						},
						text: {
							contents: "Initial text",
							height: 0.3
						}
					}
				});
				node.parent = b;

				nodes.push(node);
				await node.created();
			}

		});
	}
}

If we were to subsequently try to reparent these nodes back to A, only the ones labelled "My parent is B" would correctly move.

This bug can be reproduced with only a single child node, but is intermittent due to timing. Using 100 nodes helps illustrates the random behavior.

from mixed-reality-extension-sdk.

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