Shadow in Advance 3d Flicking

@Valentin5C40

I heard back from the engineering team — this is a resolution issue with the shadow casting box. Here's what's happening: shadows in Advanced 3D are calculated within a bounding "casting box." That box has a fixed shadow-map resolution, so if the box is large, the resolution spreads thin and shadows step/jitter as objects move.

The fix is to shrink the casting box so it covers only the shadow-casting geometry, not the whole scene. Here's how:

1. Hide everything except the pink rectangles (the actual shadow casters).
2. In the renderer settings, click "Fit to scene". This shrinks the casting box to the exact dimensions of the visible geometry.
3. Unhide the rest of your scene.

One counter-intuitive detail worth calling out: the casting box only needs to include the objects that are casting shadows, not the surfaces the shadows are landing on. So a small box around your rectangles is fine even if your ground plane extends much further.

Give that a try and let me know how it looks.

Thanks,

Nishu