Render time extremely up

[ArminBeier]

Hi
I have a very strange problem!

Octane now needs for a scene with V4 and M4 over 2 hours with 500 samples!
I re-opened a scene I rendered before, with V4 and M4 in it, which took only 2minutes for 500 samples.
The same scene now needs 11seconds for 1 sample adds up to 2hours for the 500 samples.
I haven't changed anything!
When I hide of the two figures (doesn't matter which one), it renders fast, but with both in the scene, it takes ages.
The only thing I changed from the last usage, was the location of my computer. I moved it from one house to another, but that can't be the error, because everything else works as allways, it seems (Octane for rhino).

It is possibly connected with the materials. I tested with two standart V4 and M4 a scene and it rendered it quick, but when I loaded some saved octane materials, which I saved in the library, the problem comes again. Then I removed all the octane nodes from the material room and it worked again.

I haven't updated any software and I can't remember changing any settings, since I used it a week ago.

P.S.
I have 2x GTX 780, so they should be able to render 2 simple figures!

[ch0pper]

mabye you can screen dump you screen renders and setup may give us better idea what the problem may be.

[face_off]

It could be that the imported texture has scattering on - although that shouldn't slow it down that much. Some things to check....

1) Check your card overclocking settings in the Nvidia panel to make sure the PC move didn't somehow underclock one of them.
2) Make sure both card are actually rendering (use GPU-Z)
3) Export the scene from Poser (using the latest test build of the plugin) to OCS and load into Octane Standalone 1.24 and see if the long rendertimes are replicated there
4) tick/untick importance sampling on the environment texture. If using 1.24, make sure you have the IBL set to Global Coordinates.

Paul

[Nubblet]

i'd like to add that its possible you have SLI turned on.

sometimes i forget to turn SLI off before playing around with renders - result is ultra slow renders, if it renders at all

[ArminBeier]

i'd like to add that its possible you have SLI turned on.

sometimes i forget to turn SLI off before playing around with renders - result is ultra slow renders, if it renders at all

Indeed, that's what caused the problem! thanks
But I thought I had it allways on and it worked, because I played games with it and then worked with octane later...
I am confused, but now I know at least what it is

[roeland]

I have also seen this slowdown from time to time. One thing I almost always see when SLI is turned on is that textures seem to take up double the amount of memory as expected, so even without the slow down it is a good idea to turn SLI off if possible.

--
Roeland