Vray physicall cameras

[leoviale]

Is there any difference between this cameras, I mean, video and movie cameras? There r 4 sure, but could some1 help me with that? I don't know if i have to use either one or another. Also i tried to use motion blur when u check the motion blur on the camera option, the render comes out totally black.

[Victor Erthal]

The vray physical camera works just like the regular max camera. the basic difference is that the exposure control is buit in the camera itself. It is really easy to setup if you are on linear workflow. Other than that, the vray camera also has the vertical shift (tilt shift camera).

You can see that when you switch between the different camera options in the vray camera, some adjustments will be available or not. like the latency (available on the video camera only). Personaly i use the still camera even for movies. Any other effect we might want to use, we do in post.

Abou the motion blur, i am not sure why you get a black frame. Unless you have a complex animation going on, i would recomend using the regular image motion blur. It works in most cases and is a lot faster to render.

Hope this helps.

[leoviale]

Thx, the issue is when i check the "motion blur" checkbox over the sampling rollout, it renders a black frame, and if i check "motion blur" on vray settings, on vray camera rollout, there is no blur at all.

As my camera, i trace a path where the camera follows an object and added a path constrain mod. I dunno if thats the problem.

[leoviale]

Well, now i get this error:

 

Vray exception

error: UNHANDLED EXCEPTION: Preparing camera ray sampler

 

Last marker is at .\src\vrayrenderer.cpp, line 2136: Preparing camera sampler

[ihabkal]

I think this kind of problem is better handled by Vray support...

[Victor Erthal]

i agree, i would try tech support. if it's something that can't wait, use image motion blur instead of camera motion blur. looks like your animation is simple enough to use it.

[leoviale]

If i use image motion blur also nothing happends, so I'm using a standard camera, and made a few changes in the scene, now the vray motion blur works fine. I'll upload some test then. Thx.

[bluetorch]

A little late, but I would love to know what changes you did in the scene (if you remember) because i'm having the same black screen issue.

 

Thanks!

[TomElcott]

I also had a similar problem today, simply fixed by changing the parameters of your lighting, A VRay Physical camera reads light from a VRay sun at 1-1 so put your sun intensity up to 1, when using a normal max camera your normal sun setting will be at something like .01 or .02, if i can remember correctly...