Crop & Region render + rendering time bug

[cecofuli]

Hello, same problem here, with A5 31 May ( cause Asset traking and Proxy bug in the OFFICIAL A5)
This problem is random. When I render a crop, sometimes is fast, sometimes is slow.
In this test, from the first to the second render, I just check/un-check the emitter toggle in the shader and click render. No change or modification in the rendering settings, or inside the files etc...
I can see when I have this problem, cause the "Precomputing Secondary GI" is veeeery slooow for a small crop render. Next, the refinement will be slow too.

[cecofuli]

If I cannot solve this problem, I save the file as it is,  (no close max) and reopen the file again.

[cecofuli]

Same problem with full render =(  and OFFICIAL A5

[cecofuli]

Mmm... more strange.
In my scene I've an animated camera. Last night I tried to render some frame.
Frame 0000 = 0k
Frame 0001 = ??? O__O  10 passes in 2 hours?
Frame 0002 = Ok
Frame 0003 = Ok
Frame 0004 =  ??? O__O Again, the same bug.

etc...

[maru]

My guess is it's HD cache related.

[Polymax]

Very strange, never such was not and can not be repeated.

[cecofuli]

Yes, it's very annoying. It's impossible to work!!! Ondra told me that the problem could be in some shaders (textures). But this is not true.
with Ovverride (150 150 150) I had the same problem...
I have to "find" the bug, but it's difficult, cause it 's random. for example, sometimes, only by moving, in the viewport, the "region" rectangle, the speed come back good =(

[maru]

Does this happen with the default VFB?
Does this happen when HD cache is disabled (for example when rendering in pt+pt)?

[cecofuli]

I think it's geometry related but. But its difficult to understand why it's happen, cause it's so random. If I hide a layer, the speed is good. I unhide and it's slow.
I close max and re-open the file (with the layer un-hide) and the speed is good! Headache!

[maru]

Does it also happen when you are not region-rendering, just the whole image?

[cecofuli]

Yes, as in my previous message/image: 2 hour and only 10 passes in 1080p

EDIT. in this file I used a lot quadchanfer modifier. BTW, I want to collapse my geometry to a simple edit poly.

Situation: PT+HD = slow. Next, I only change in PT+PT = no problem (obviously)- Return again PT+HD = slow
With no VFB or default, same problem.

[cecofuli]

After to convert everything in mesh ( I lose all istances, quadchamfer plug etc...) no bug. The HD is fast now.  I upload the file to Ondra. We will see where is the "bug".
FILENAME: 0004_BUG.rar

[Ondra]

Fixed