Animation and V-Ray physical camera

[kubbek]

Is it possible that physical camera doesn't work with animated channels? It seems that animating any camera channels destroys my exposure control

[vladimir.nedev]

Can you show me an example of what happens. An example simple scene will be most useful.

Greetings,
Vladimir Nedev

[kubbek]

Can you show me an example of what happens. An example simple scene will be most useful.

Greetings,
Vladimir Nedev

I am rendering bigger project now but as soon as I can I will send you an example.

I use animation as batch render for different views of a scene. For different cameras I have different hdri environments for several cameras and I need different exposure settings for each. Usualy I would change physical camera settings but that is what get lost when I keframe "render camera" in render tab. Now I have to change environment intensity and also keyframe intensity of every light in the scene.

Jakub

[vladimir.nedev]

I am rendering bigger project now but as soon as I can I will send you an example.

I use animation as batch render for different views of a scene. For different cameras I have different hdri environments for several cameras and I need different exposure settings for each. Usualy I would change physical camera settings but that is what get lost when I keframe "render camera" in render tab. Now I have to change environment intensity and also keyframe intensity of every light in the scene.

Jakub

Ah yes, you've mentioned this before. Animating the Render Camera will not work for the physical camera parameters.
I will write it down as a request.
A scene will still be helpful for testing.

Greetings,
Vladimir Nedev

[kubbek]

Ah yes, you've mentioned this before. Animating the Render Camera will not work for the physical camera parameters.
I will write it down as a request.
A scene will still be helpful for testing.

Greetings,
Vladimir Nedev

I attach sample scene and preview renders how frames 1 and 2 should look like - it looks like that until I key "render camera" channel in render item. Both cameras have changed exposure parameters to look correctly but as soon as I key "render camera" channel exposure gets messed up. Most often the first selected camera renders right but when you go to another key in the timeline you get wrong exposure.

Best,
Jakub

[vladimir.nedev]

This is fixed in today's nightly build ( 2016.06.12 ).

When animating the "Render Camera" channel in the Render item, there are still quite a few restrictions.
All the cameras that are keys of "Render Camera" must have:
1. the same type, either all normal or all V-Ray Physical Camera
2. the same projection type (perspective/spherical/fish eye/box/etc)
3. the same DOF state (either on or off; with the same iris blades and edge weighting if it is a non V-Ray physical camera; F-stop and other DOF related parameters can change)
3. the same motion blur state (either on or off, and with the same duration)
4. the same stereoscopic state (either on or off, with the same output layout, selected eye and shade map settings; only the interocular and convergence distances can change)
5. the same clipping plane state (either on or off, with the same exclude list; the clipping distance can change)

These are all the things that cannot be animated on a single camera either.

If you are rendering a single frame, then restrictions 2 and 3 don't apply.

So, the issue you reported here is also partially fixed : http://forums.chaosgroup.com/showthr...hlight=animate
If you render single frames it will work fine. But if you render an animation, you need to make sure that all cameras have the DOF check-box enabled.

Lifting these restrictions will require either:
- changes to the V-Ray core which might not be trivial, since these values were never meant to be animatable
- changes to how V-Ray for MODO renders animations, I could add a special case for when the "Render Camera" channel is animated, and render each frame as a separate animation, but this might have some unforeseen side-effects, which will have to be fixed as well

Eventually I will add pass rendering, which will start rendering from scratch for each pass anyway, and you will be able to have the different passes use any camera.

Greetings,
Vladimir Nedev

[kubbek]

Thank you, I am perfectly fine with this restrictions. Good to hear you plan to add pass rendering as well!