Add an option to change the length of DirectionalLight2D's shadow

[Nicatpng]

Describe the project you are working on

When you enable the shadow option for DirectionalLight2D it draws a shadow but the length of the shadow is infinite and cannot be changed. It would be great if we could change the length of the shadows

Describe the problem or limitation you are having in your project

There is no way to change the DirectionalLight2D shadow length. The only way to do this is to write a shader script.

Describe the feature / enhancement and how it helps to overcome the problem or limitation

You can't change the length and there are no other option

Describe how your proposal will work, with code, pseudo-code, mock-ups, and/or diagrams

Add an option to the shadow section for DirectionalLight2D named Length

If this enhancement will not be used often, can it be worked around with a few lines of script?

It will be used a lot and I think it can be done with a few lines of script

Is there a reason why this should be core and not an add-on in the asset library?

This is a must have feature. There aren't many options for the shadow property so this would be great

[Calinou]

I think it can be done with a few lines of script

As mentioned in the documentation, this is not technically feasible with built-in shadows due to how they are drawn.

Instead, you need to use a custom shader that reads from the signed distance field generated by LightOccluder2D nodes and creates shadows based on this SDF. This is how techniques such as 2D global illumination can be implemented.

[Ieida]

Not very convenient having to do all that for such a basic feature.