Same settings different results

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Lal-O
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Same settings different results

Post by Lal-O » Tue Jan 03, 2017 4:43 pm

Hi guys .
I have a question ... Why do i get different results from a scene ( with the same settings ,lights , camera ,geometry etc.etc .) if i change the rendering mode?
If i use CPU+GPU i get darker joints and brighter renderings...Is that normal? :roll: In some cases the dark joints seem to be a bad modeling problem.
Everything is fine only with CPU. :D

Thx in advance.
Attachments
CPU.jpg
CPU+GPU.jpg

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Zom-B
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Re: Same settings different results

Post by Zom-B » Thu Jan 05, 2017 12:40 am

Yes, I reported a quite similar issue back in 4.0.15 to the devs, I tested the example scene I provided back in the day and can reproduce the problem:
darkening.jpg
left CPU - right GPU
Lal-O wrote:If i use CPU+GPU...
In your case you only render with the Titan X card, no CPU involved here :)
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Oscar J
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Re: Same settings different results

Post by Oscar J » Thu Jan 05, 2017 12:43 am

Lal-O wrote:Hi guys .
I have a question ... Why do i get different results from a scene ( with the same settings ,lights , camera ,geometry etc.etc .) if i change the rendering mode?
If i use CPU+GPU i get darker joints and brighter renderings...Is that normal? :roll: In some cases the dark joints seem to be a bad modeling problem.
Everything is fine only with CPU. :D

Thx in advance.
While it's weird that the brighness is different, I kinda like the GPU render better. :)

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Re: Same settings different results

Post by pixie » Thu Jan 05, 2017 1:40 am

Oscar J wrote:While it's weird that the brighness is different, I kinda like the GPU render better. :)
GPU makes everything better! :D

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Lal-O
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Re: Same settings different results

Post by Lal-O » Thu Jan 05, 2017 4:17 am

Zom-B wrote:Yes, I reported a quite similar issue back in 4.0.15 to the devs, I tested the example scene I provided back in the day and can reproduce the problem:
The attachment darkening.jpg is no longer available
Lal-O wrote:If i use CPU+GPU...
In your case you only render with the Titan X card, no CPU involved here :)
Yeah but as long as i know the goal of using both (CPU+GPU) is getting faster rendering times, right? Most of times my deadlines are really short so i think that disabling any of them is not an option to me :cry: ....just a tought :D

Here is another example of a " bug " in the joints with CPU+GPU

I can deal with brightness variation in the images, but the "light" through some joints i think is a problem :|
Attachments
Lobby.jpg

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Oscar J
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Re: Same settings different results

Post by Oscar J » Thu Jan 05, 2017 4:21 am

Does look like some sort of precision issue.

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Re: Same settings different results

Post by Eneen » Thu Jan 05, 2017 4:36 am

Maybe obcjects have their origin far from geometry?

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Lal-O
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Re: Same settings different results

Post by Lal-O » Thu Jan 05, 2017 4:43 am

Oscar J wrote:Does look like some sort of precision issue.
Yes it does look like, but the model is really well done, i can assure you that :wink:
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Lobby Model.jpg

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Oscar J
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Re: Same settings different results

Post by Oscar J » Thu Jan 05, 2017 4:45 am

Yeah I meant an Indigo precision issue. :)

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Re: Same settings different results

Post by Eneen » Thu Jan 05, 2017 4:52 am

Does adding floor cap at the bottom fix it?

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Lal-O
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Re: Same settings different results

Post by Lal-O » Thu Jan 05, 2017 4:59 am

Oscar J wrote:Yeah I meant an Indigo precision issue. :)
Ooooohh i see... Yes , it seems so :D

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Re: Same settings different results

Post by Lal-O » Thu Jan 05, 2017 5:03 am

Eneen wrote:Does adding floor cap at the bottom fix it?
I tried with and without the floor cap and no luck. Only CPU and problem solved :D

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Re: Same settings different results

Post by Zom-B » Thu Jan 05, 2017 6:01 am

Lal-O wrote:Yeah but as long as i know the goal of using both (CPU+GPU) is getting faster rendering times, right? Most of times my deadlines are really short so i think that disabling any of them is not an option to me :cry: ....just a tought :D
still you are not rendering with you CPU in GPU mode mate, believe me!

You have no openCL drivers for your CPU installed, otherwise your CPU would be in the OpenCL device list, doublecheck CPU usage during rendering when your Titan card is active and you'll see!
It should look more like that:
CPU.PNG
CPU.PNG (10.46 KiB) Viewed 3104 times
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Zom-B
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Re: Same settings different results

Post by Zom-B » Thu Jan 05, 2017 6:02 am

Lal-O wrote:I tried with and without the floor cap and no luck. Only CPU and problem solved :D
Maybe you could copy these few elements in a new scene and upload it, so the devs have some reduced scene to test while fixing it :)
polygonmanufaktur.de

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Lal-O
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Re: Same settings different results

Post by Lal-O » Thu Jan 05, 2017 6:29 am

Zom-B wrote:
Lal-O wrote:Yeah but as long as i know the goal of using both (CPU+GPU) is getting faster rendering times, right? Most of times my deadlines are really short so i think that disabling any of them is not an option to me :cry: ....just a tought :D
still you are not rendering with you CPU in GPU mode mate, believe me!

You have no openCL drivers for your CPU installed, otherwise your CPU would be in the OpenCL device list, doublecheck CPU usage during rendering when your Titan card is active and you'll see!
It should look more like that:
CPU.PNG
OH MY GOD!!!... I've been living a lie!!!...I've always thought that by simply checking on the OPENCL feature i was able to render with CPU and GPU at same time. I feel so dumb :x.
Would you please tell me what do i need to do to get my CPU shows up in the device selection? Is an Intel I7 5960X. I would really apreciate your help :D

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