IR Subsampling question: slow when with animated camera. Why?

[cecofuli]

Hello,

this is the situation:

1:  simple scene with plane and scattered trees;
2:  Ir Sub-sampling as default;
3:  PT+PT

(*) If I rotate the viewport manually, I have FPS = 10.
(*) If I have an animated camera (for example, with Path constraint controller) and I scroll the timeline manually, the FPS = 2-3

So, why?

[maru]

How are the trees made? Is it Corona Scatter or some plugin? Does the same happen with some more simple scene, like a plane with teapot?
It might mean that some geometry is reloaded per frame.

[cecofuli]

Hi Maru, they are a simple AEC 3ds max trees with CoronaMtl.
But, it happens in every scene, also with a simple test room with a window, pr a plane with teapot.
Look at the scene in attachment and see with your eyes.

[Ludvik Koutny]

Because moving timeline causes Corona to re-parse the entire scene from scratch, and currently, there is no way to avoid it.

I proposed a "lock" feature for camera animation previews, which when enabled, would freeze updates of everything in IR except camera position. It would work for camera animation previews, but not for animation of anything else in IR.

[cecofuli]

ahh, ok... Sad to know that it isn't possible to avoid.
But, your idea it very good. =)