slow rendering.. really slow

[ae28402dk]

Hi, I'm testing corona 2-3 weeks. Always was rendering so fast, but today is so slow. 13 passes in 90 minutes (res 3700x2080 pix)...
I have hdcache. i7, 16gb ram, 2g graphic.

What can I do to make rendering faster?

[Ondra]

Are you using motion blur?
Portals?

[ae28402dk]

No motion blur, no dof, or any other unusual effects.
I stopped rendering and started again, but it's still slow, initial pass in 10 minutes, it always was only few seconds. :(

[rafpug]

You used materials with high values ​​of refraction?

[ae28402dk]

yes, but it was never a problem for corona on my computer. In my last scene I used more materials with high values ​​of refraction, but rendering was 10 times faster.
Could it be a problem with 'visibility for camera"? Because I have hidden some objects.

[rafpug]

1 - What are these objects?
2 - The scene is outside or inside?
3 - Is converted into a scene full crown or designed from scratch to you?

Give it a try and reset the render settings

[ae28402dk]

1. 6 or 8 glasses, and few kichen accessoires
2. inside (it's a kitchen)
3. designed by me

I was restetin corona setting 3 times, but it doesn't work, it's even crashing when rendering :/

[rafpug]

uninstall corona

and installs .

[Polymax]

You use last DayBuild?

[Ondra]

ok, give me the scene, I'll take a look

[ae28402dk]

Problem solved, I finished rendering after 36hours and only 300passes, closed the scene, and opened several times, and everything came back to normal. I think it's another bug in corona alpha. 

[Ondra]

By any chance, are you using max 2014?

[ae28402dk]

Yes, 2014, could it be because of that?

[Ondra]

Yes, there is a bug that causes some textures to be EXTREMELY slow when 3dsmax is first run. Usually just stopping/restarting rendering works.

[ae28402dk]

Thank you for your reply, even with bugs I'm truly impressed by corona :)

[ae28402dk]

The same problem again, but this time reseting the rendering doesnt help. Also the issue is that rendering 24h with 200passes is not equal with quality of 5h and 200 passes when program is free of bugs (after 100x reseting).

[Ondra]

so... extremely small number of rays/s in the beginning, and then it starts to increase?

[ae28402dk]

so... extremely small number of rays/s in the beginning, and then it starts to increase?

Yes :(

[Ondra]

ok, then it is the same bug. I also get it from time to time, unfortunately currently I have NO idea what is causing it :/

[ae28402dk]

I've noticed that bug appears sometimes when some objects are "invisible for camera", but not always. In other cases I don't know why this bug appears.
Another question: Is it normal that when I try to zoom while rendering the corona is crashing?

[Ondra]

are you using alpha v5, or daily builds?

[ae28402dk]

alpha v5

[Ondra]

yep, there was a bug, but I hope it should be fixed already in next release