Background Environment override affected by Physical camera?

[jasonhuang1115]

Hi,

Trying to confirm an issue (or feature?) that I am experiencing.

Issue 1: when using IPR with Maya Image Plane display in RGB, the IPR starts out correct but as soon as I start changing attributes (ex. light's intensity), objects in the scene that are set as matte object then turn black (which is the default background color I suppose), instead of what's in the image plane.

So, I turn Image Plane display to "None" and set Background override with the plate image in "Screen" mode. Now IPR (CPU) renders as expected for those matte objects BUT

Issue 2: the Physical camera is affecting the brightness of the Background override image in both IPR (CPU) and ADV progressive render.

I double check that in Color mapping that I have "Affect background" disabled and I don't have "Enable vignetting effect" in my physical camera.

Did I miss something or if there is a way to tell physical camera to not affect whatever that is plugged in the Background Environment Override?

[yolov]

Issue 1: when using IPR with Maya Image Plane display in RGB, the IPR starts out correct but as soon as I start changing attributes (ex. light's intensity), objects in the scene that are set as matte object then turn black (which is the default background color I suppose), instead of what's in the image plane.

So, I turn Image Plane display to "None" and set Background override with the plate image in "Screen" mode. Now IPR (CPU) renders as expected for those matte objects BUT

This is actually correct, the matte objects will directly return what is in the background override.

Hi,
I double check that in Color mapping that I have "Affect background" disabled and I don't have "Enable vignetting effect" in my physical camera.

Did I miss something or if there is a way to tell physical camera to not affect whatever that is plugged in the Background Environment Override?

The color mapping "affect background" is for the color mapping only. The Physical camera's exposure settings will always affect everything. I don't know if there's a way to go around that beside disabling the exposure, but then you will need to readjust light intensity.

[jasonhuang1115]

Thanks for getting back to me, yolov.

This is actually correct, the matte objects will directly return what is in the background override.

But what is weird is IPR starts out with matte objects return what is in the Image Plane (basically the intended background plate) and this is the result I want to get as I want to see the lit CG against the plate. However, as soon as I start tweaking light attributes while still in IPR, matte objects all of sudden returns black which, like you said, is the background override. I then lost the context to see how the lit CG sits in the plate.

The color mapping "affect background" is for the color mapping only. The Physical camera's exposure settings will always affect everything. I don't know if there's a way to go around that beside disabling the exposure, but then you will need to readjust light intensity.

To work around the above issue, I map the plate as Background override (screen mode), hoping the matte objects return the projected plate during IPR and lighting tweak. It does, but now the projected plate is affected by Physical Camera. I lost the context because the lit CG now sits in a plate that is affected by Physical camera.

So, is there a way to IPR with physical camera so that matte objects always return projected plate (be it Image Plane or Background override in Screen mode) as not affected by anything. I think it's pretty common to have the plate's pixel value stays consistent when you light a scene for integrating CG into a plate.

[yolov]

Sounds more like an IPR bug. I'll test and get back to you.

[jasonhuang1115]

Hey Yolov, have you found anything/bug on this issue?

I am ok with using either the Image Plane or "Screen" mode of Background override. At least one of approaches needs to provide the functionality for users to IPR with physical camera while seeing the plate image stays the same for proper CG integration.

[shaio]

Hello,
I've logged the issue and will update the thread as soon as it's fixed.