Zbuffer with Volume Rendering

Support
1

Hello everyone,
I’m trying to read the Zbuffer / depth buffer during volume rendering. For this I use
renWin-> GetZbufferData (x1, y1, x2, y2) and if I look at the values, there are all values equal to 1. If I have the image output with vtkWindowToImageFilter, it is simply black.
Does anyone know where my problem is and how to read the ZBuffer in volume rendering?

Best regards,
Alex

2

The volume mapper just writes the bounding polygon to the Z buffer. To access true depth data of raycasting, enable RenderToImage and once rendering is complete, access the color and depth data using GetColorImage / GetDepthImage methods.