No way to disable casting of shadows on gridmap

[Scott3730]

Godot version: 3.0.1 rc

OS/device including version: Windows 10

Issue description: I'm attempting to stop meshes in a gridmap from casting shadows. The only way to do this that I'm aware of is via a property on the GeometryInstance, which does not appear to be exposed through the gridmap API at all.

Steps to reproduce: Create a gridmap the usual way, supply it with a meshlib theme, and try to stop it from casting shadows on other objects.

[reduz]

There is now an option to not receive shadows in the material, so i guess this may suffice?

[akien-mga]

No answer, so assuming what reduz mentioned is sufficient.

[Janders1800]

Resurrecting this post because I'm encountering this problem.

Godot 3.X: Wen lighting GridMaps sometimes it is necessary to disable shadows if you are working with Lightmaps. In this example I need to disable the GridMap shadows wen executing the game so the character can have dynamic shadows casting on the baked GridMap.

This is an example of the GridMap casting unwanted shadows.

Wen the desired outcome would be something more like this + character shadows that can be accomplished disabling the Gridmap shadows.

reduz solution doesn't work because disabling receive shadows in the material will also disable other shadows cast by other objects, same as shown in the second screenshot.

[Calinou]

@Janders1800 This is already being tracked in https://github.com/godotengine/godot/issues/78344.

In this example I need to disable the GridMap shadows wen executing the game so the character can have dynamic shadows casting on the baked GridMap.

I find it surprising you have to do this. If you disable shadows on the GridMap, the directional light will shine through, which breaks the point of baking lightmaps in the first place.

Instead, you have two solutions:

• Use the Static bake mode for positional lights, and Dynamic (indirect only) bake mode for the directional light. This is a good approach for desktop and high-end mobile devices.
• Use the Static bake mode for all lights, and a Decal node to cast a blob shadow below the character. This is a good approach for low-end mobile devices.

[Janders1800]

Neither are good solutions. I'm using 3.X, I don't know if the option is available on 4.X but it isn't on 3.X.

• That's exactly what I'm doing, DirectionalLight is the one casting the character shadows, so they are functional level wide. And that's what creates the unwanted shadows in the Gridmap.
• Decals don't exist on 3.X ( I know I can use a negative light to simulate a decal, but the character needs dynamic shadows)