Using THREE.js to render an object only when it is in the foreground of another object

Is it feasible to render only the portion of Object 2 that hides Object 1?

I am attempting to replicate the CanvasRenderingComposite destination-in effect in a 3D environment using THREEjs, essentially utilizing Object 1 as a mask.

https://i.sstatic.net/UacQv.png

Answer №1

It seems like you are interested in modifying the Material.depthFunc attribute. By default, it is configured as LessEqualDepth, as explained in the documentation:

LessEqualDepth is the default setting and will evaluate to true if the incoming pixel Z-depth is less than or equal to the current buffer Z-depth.

To achieve a different result, you can consider using either GreaterEqualDepth or GreaterDepth:

GreaterEqualDepth will evaluate to true if the incoming pixel Z-depth is greater than or equal to the current buffer Z-depth.

You should be able to achieve your desired outcome by utilizing:

object2.material.depthFunc = THREE.GreaterEqualDepth;
, or setting this option during material creation.

If you wish to explore other depthFunction possibilities, refer to the Materials constants page and navigate to the "Depth Mode" section.

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