Stereoscopic Rendering with Phoenix

[ben_hamburg]

Hi,

we are revisiting our last project, where we first used Phoenix for fluids and we now have to produce it in stereoscopic 3D. I already produced a project in stereoscopic 3D with vray, so I know the basic set up.
I´m just curious, if there is anything we need to consider with fluids, for example: Does the infinite ocean including displacement work as it is? Anything we need to consider with foam and splash particles?

[Ivaylo Katev]

well, my first suggestion was that the ocean may produce problems. the ocean uses the camera position to calculate the visible area, that is changed in stereoscopic rendering.
this is the only part that i expect to be problematic, say us what is the result

[ben_hamburg]

I just rendered a still frame and that looks perfect. Testing now with a short animation range...

[Ivaylo Katev]

well, my expectation is that it will work, but the cases when the displacement pulls the waters borders inside the visible frustum will increase.

[ben_hamburg]

Yeah, animation works as well. For the problems with displacement our compositing fix will hopefully work (masking the holes and mixing with vray displacement Surface) as well.

[Ivaylo Katev]

btw, finally the displacement holes near the border are fixed, available in the tomorrows build

[ben_hamburg]

Oh, that are some very nice news! Just in time before we are starting our new renders!

[ben_hamburg]

Little update: We did run into problems with the ocean displacement in stereoscopic rendering - holes at the border of the image, probably due o the shifting of the camera for stereoscopy.
Since this is kind of a specific problem due to stereoscopic rendering, we´ll just render more overscan, don´t know if this is fixable...

[Ivaylo Katev]

yes, the holes are fixed only for non stereoscopic rendering, we have to use both the cameras to displace the mesh for the complete solution. for now you have to render wider region and to crop the result

[ben_hamburg]

Yeah, like I said, that workaround is fine for us right now because everything else works as it´s supposed now.

[ben_hamburg]

Unfortunately there seems to be another Issue: Render elements don´t seem to work properly with stereoscopic renders.
I had to disable "adjust resolution" in the stereoscopic helper, since the render elements didn´t work, if I didn´t use the Vray frame buffer to save out my files.
So I had to rerender the shots to get wire color and Zdepth elements.
But there seems to be an Issue, as the render element gets cut on some parts of the image.
Don´t know if this is a bug, or If I did something wrong while rendering those extra passes.
I attached an image to show the issue.

[ben_hamburg]

Ok, it seems not only render elements don´t work, I just made another test and the rgb pass is messed up aswell.
Looks like if I turn off "adjust resolution" in the stereoscopic helper and set the resolution by hand, the fluid only renders partly. So the solution would be to enable the vray framebuffer and save out the render elements from there, instead of using 3ds Max render buffer, something I mainly avoided so far, because I like to rename my elements and sort them into folders neatly...

[Ivaylo Katev]

is the render elements problem only with phoenix?

[ben_hamburg]

the problem seems to only be with phoenix´s ocean extension

[Ivaylo Katev]

ok, we will try to reproduce this. it's weird, because the ocean is actually an ordinary mesh.