David Vincent-Jones wrote:
> 
> I am working on a project with a very large geographical span.
> This entails a huge height_model and a thousand or more objects.
> 
> The project is animated so that I travel through the space.
> 
> Display time is slow and I would like to speed things up substantially.
> 
> The bounding option does not appear to really help and I am interested to
> explore the possibility of using the inside of a reduced radius sky_sphere
> to lop off part of the scene.
> 
> I have tried to translate a simple sphere along with the camera position but
> the time has not really improved enough to make a substantial difference.

I think, that this cannot help, because if you want to cut off all
objects outside your sphere you must set clipped_by { your_sphere
inverse} to them
and ALL rays going from camera will intersect this sphere =>
=> no speedup from it, it makes no differences from scene without that
sphere,
even one more needless sphere is evaluated with each ray => I expect
small
slowdown from it. Forgot I something?

> 
> Has anybody used this approach for bounding control and had any success?

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