Get the framebuffer image from specific object

Questions
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1

Is possible get specific rectangle from a framebuffer? My scene have multiple objects, I need get the framebuffer image of only one specific object in the scene, how can I get that?

image

2

Are you looking for something like this?

https://threejs.org/examples/#webgl_framebuffer_texture

3

Yes, but I need to know the area that cover the object, like a bounding box in 2D

5

Have you tried to transform the object in screen space and then calculate the corresponding bounding box? In any event, what is you use case for this bounding box or “area”?