[vtkusers] Blend result from two renderings

[Yixun Liu]

Hi All,
I have a question about rendering.
Let's say in the scene, there are two objects A and B and A is before B.
Can I separately render A and B and then blend the two 2D images, but still
maintain the depth information, i.e., A looks before than B?
I ask this is because I have an image from a real camera and a image from a
virtual camera and I want to blend them.

Thanks a lot.

Yixun
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