Helper for composing (instead of vrayspherefade)

[RSF]

Hello.

I'm trying to struggling with methods to compose the moving geometry (some people and cars) in the existing static scene animation.

The main methods are to use matte objects or to use the vrayspherefade effect but both have issues (explained at the end)

My proposal and curiosity regarding its feasibility is this.
Is it possible to have vrayspherefade render the exterior of the defined volume as matte?
Of course the would be even better if only the necessary screen area could be calculated.

I think this would have great advantages...I'm I right? I'm I missing something?
Is this difficult to implement?

Vlado??

Thanks


Problem descriptions:

The matte method problems:
- The whole image is evaluated and even matte geometry takes some time to (not)render.
In scenes with where the moving objects to compose are a small portion of the entire scene this would me more evident. Some times hiding the necessary geometry in order to optimize the pass could be cumbersome.
- There are some issues regarding shadows composed on top of other shadows.

VraySpherefade problems:
- The problem here is that it won't take into account geometry outside the sphere that gets in front of camera and occludes the object.

[dbuchhofer]

I think the problem comes in where it needs to calculate a certain amount of the surrounding geometry anyway to do the lighting/reflections/occlusion masking, so removing it from the calculations altogether doesn't work as well as you would think, hence the spherefade really just removes them from the somewhat secondary portion of the overall AA

[RSF]

I mean removing like when region rendering...
Of course when rendering that regions it needs to eval other portions of the geometry but...thats a smaller region to render right?

[vlado]

VraySpherefade problems:
- The problem here is that it won't take into account geometry outside the sphere that gets in front of camera and occludes the object.

Hm, as far as I know, geometry in front of the sphere gizmo will correctly block the occluded parts of the gizmo.

Best regards,
Vlado

[RSF]

I'm terribly sorry...my bad!!
I did a test about a year ago and I was convinced it didn't work!!
Sorry again...but great anyway