Implementing a "transparency" lense

Brainblox

Is there a way to partially hide objects in godot? What I aim for is this effect for objects in front of the player:

cybereality

Is this in a 2D game? I think there are ways to use Light2D as a mask.

Brainblox

@cybereality said: Is this in a 2D game? I think there are ways to use Light2D as a mask.

Sadly, its a 3D game. The only method I had in mind is a box shaped are from camera to player, but that hides the complete node.

xyz

What happens with the background inside lens? Does it completely disappear? What if several objects you want to show are depth-wise sandwiched between several objects you want to remove?

This can be handled in multiple ways depending on the exact effect you're after. As of now the problem is rather vaguely defined. It might be useful to make a photographic mockup of how things should actually look.

cybereality

You can do this with viewports and culling masks I believe. The issue is that viewports are rectangular (sort of like a portal). But you could write a shader to display a viewport texture on a quad, and mask it to a circle in the shader code by using discard or manually writing to the alpha channel. Not sure what your level of experience is with shaders, but that would be one solution.

TwistedTwigleg

For 3D, I would recommend using a color mask with a Viewport and then have that as an input for the MeshInstance nodes you want to make transparent. Then you can have a sphere or a textured quad render to the color mask so you can get different shapes.

It's a few years old, but I wrote a tutorial on color masking in Godot using a Viewport texture that may be helpful. In particular, the example shown at section 5.1 may be similar to what you are looking for, I think.