Is it possible to cast shadows from a transparent or invisible object?

bluepangolin55

I'm using a plane with a transparent material to model the water in my game. To make the material transparent I need to set the transparent flag. However if I do so, the object stops casting a shadows. I would like the plane to cast a shadow to make the area below the water darker. Is there a way to make transparent objects cast shadows? I've been trying to set the 'depth draw mode' to 'opaque pre-pass' which allows transparent materials to cast shadows. ( https://godot.readthedocs.io/en/3.0/tutorials/3d/spatial_material.html?highlight=material ) Apparently this option was called 'alpha pre-pass' in Godot 2. However I was not able to cast any shadows from my transparent plane.

I would also be happy to simply have an invisible object that casts shadows but I don't know how to achieve this.

MagicLord

The best solution is to use shaders instead like multi texturing that will apply some underwater texture below some water height treshold.

However, there is a simple trick without shaders. Duplicate your water plane mesh, give it a transparent dark grey texture that will darker anything behind it. Place slightly it under the water plane.

bluepangolin55

Thanks! I was looking for a simple trick like that :)