is there any way to output the depthTexture of the volumeMapper while rendering the volume but not renderToImageOn?

[gpu]

is there any way to output the depthTexture of the volumeMapper while rendering the volume but not renderToImageOn?
Thanks

[sankhesh (Sankhesh Jhaveri)]

You could attach a frame buffer object to the window and render to it similar to what RenderToImage does.