shadow of OmniLight and SpotLight not working on Android mobile

[norrath-hero-cn]

Godot version

Godot Engine v3.4.rc2.official.23955fc28 and Godot Engine v3.3.4.stable.official

System information

Android 9, Adreno (TM) 616, GLES2 and GLES3

Issue description

Godot Engine v3.4.rc2.official.23955fc28 - https://godotengine.org
OpenGL ES 2.0 Renderer: Adreno (TM) 616
OpenGL ES Batching: ON

Shadow of OmniLight and SpotLight not working on Android mobile

Works fine on windows

Steps to reproduce

1. create a empty scene
2. add csg cube to make a ground
3. add two meshinstance
4. add OmniLight and SpotLight, enable shadow
5. export apk
6. test run on an android mobile

Minimal reproduction project

shadow.zip

[Calinou]

Vertex shading is forced by default on mobile, which is likely why it doesn't work there (your ground plane lacks subdivision).

To resolve this (at a performance cost), disable Force Vertex Shading.mobile in the Project Settings and export to Android again. That said, the better solution to preserve performance is to subdivide your ground place to a reasonable level to allow individual vertices to be lit by the SpotLight.

Or, better, use fully baked lightmaps to get the both of both worlds 🙂

[norrath-hero-cn]

Vertex shading is forced by default on mobile, which is likely why it doesn't work there (your ground plane lacks subdivision).

To resolve this (at a performance cost), disable Force Vertex Shading.mobile in the Project Settings and export to Android again. That said, the better solution to preserve performance is to subdivide your ground place to a reasonable level to allow individual vertices to be lit by the SpotLight.

Or, better, use fully baked lightmaps to get the both of both worlds 🙂

After disable Force Vertex Shading.mobile, shadow of OmniLight works fine, but when enable SpotLight shadow the SpotLight are complete ignoired, is this a design or a bug? I confirm this by "Deploy with Remote Debug" and manually enable/disable SpotLight shadow multiple times

[Calinou]

Duplicate of #25526.

[norrath-hero-cn]

After flipping around some options in the Project Settings->Rendering->Quality page, I find some interesting things

1. restore all options to default value
2. disable "Force Vertex Shading.Mobile"
3. set "Filter Mode.Modile" to PCF5 or PCF13

Spotlight with shadow work fine on my device, blow picture are captured on same android device

here are some extra tests:

disable "Force Vertex Shading.Mobile", but set "Filter Mode.Modile" to disable

enable "Force Vertex Shading.Mobile", but set "Filter Mode.Modile" to pcf5

enable "Force Vertex Shading.Mobile", but set "Filter Mode.Modile" to disable

it seems the logical related to "Filter Mode.Mobile" is critical to this issue, some things related to "Filter Mode.Mobile" is broken Spotlight and shadow

@Calinou

shadow.zip
this project works fine on my device, please compare the difference to find what real issue is, wish you can fix this, many thanks!
maybe #25526 is the same issue

this is a long time issue on the wild, after this I feel Godot 3.x is perfect!

[norrath-hero-cn]

New founds on PC, set renderer to gles2, then set Shadows->"Filter Mode" to disable, spotlight with shadow not working on pc too

I will report as a new issue

[norrath-hero]

Just confirmed this fixed by #69826