CreateScreenshotUsingRenderTarget does not render meshes hidden for active camera

[Pascal Bayer]

I'm currently facing a strange behavior of the CreateScreenshotUsingRenderTarget and not sure if that is on purpose or a bug.

I want to create an image (rendering screenshot) that contains all meshes of the scene, however I have two cameras, one for rendering the viewport (only part of the overall scene) and one for the screenshot rendering (covers the whole scene). The PNG file rendered has the correct size but does only contain meshes that are visible (or partially visible) for the active viewport camera, all other meshes are missing. Is there a way to workaround or fix this behavior?

[brianzinn]

One workaround is :

mesh.alwaysSelectAsActiveMesh = true;

Here's a PG I made testing that on GUI.
https://www.babylonjs-playground.com/#HJI09Z#1
If that kills performance too much, you can try enabling and disabling on all meshes before/after screenshot.

[Guest]

This is an "expected" behavior as the main camera defines the active meshes. @brianzinn solution is fine

[Pascal Bayer]

@brianzinn Thanks for the solution, got it working after figuring out that I have to set `alwaysSelectedAsActiveMesh` not only on the parent mesh but also on all child meshes.

@Deltakosh Thanks for clarification, might be worth to be added to the docs: https://doc.babylonjs.com/how_to/render_scene_on_a_png

[Guest]

You are right, do you want to contribute?

[Pascal Bayer]

@Deltakosh I've submitted the following PR: https://github.com/BabylonJS/Documentation/pull/1105

[Guest]

And it is merged! THanks a lot