[vtkusers] Problem about Blending Two Image Rendering by Offscreen.

[LaChen]

Hi, I have a problem of blending two offscreen image together.

I want to do multi-volume rendering(Two volume data inputs) but I can't find
any component in VTK about this. After of all, this request is so customized
that user should write by theirselves. So I reference method of
/(Multi-volume) NCI GPU Ray Casting /and try to make it by myself.

There are some steps in my idea.
     <1> Render main volume first by OpenglGPUVolumeMapping in off screen
rendering.
     <2> Render second volume first by OpenglGPUVolumeMapping in off screen
rendering.
     <3> Blend two image together with weight and render to *another
component of VTK*.

But I don't know which component I can use. I must render the blending
result into the one with full widget size(I use QVTKWidget) and I can't move
the widget polygon. Or, should I needs get those offscreen buffers and make
them to opengl texture for blend them by myself?

Thanks. 



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