Line end-point delay - speech bubble

[vx9]

Hello Everyone,

I’m trying to build a speech bubble dialog system. I have a line drawn from an object to another object parented to the camera.

The end point of the line is supposed to be drawn to the center of the box. When walking around (WASD or arrow keys) or swiveling with the mouse, the line lags behind and often pokes through the box. Anybody have an idea why this happens?

Babylon.js Playground

Thanks for the help!

[vx9]

I finally found the solution. I added a dialogBox.computeWorldMatrix(true);
https://playground.babylonjs.com/#K8FCY7#2

I’ve read what I can on computeWorldMatrix but still don’t know why this fixes it. Any chance someone can enlighten me?

[JohnK]

See

What the `computeWorldMatrix()` does and when to use it?

When a mesh is created the vertexData for the mesh is maintained unless updated by the user. The position, rotation, scale of the mesh is stored in its worldMatrix which is then used to render the mesh in the correct placement and orientation. The worldMatrix is calculated, normally, just before rendering takes place. When you write code that alters the position, rotation or scale of a mesh there will be times, as per your example, when there will be need for the worldMatrix to be known to cha…

As you are using onBeforeRender the same holds