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rendering issue related to the world position of objects.

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rendering issue related to the world position of objects.

Unread postby nareineru » Fri Mar 15, 2019 2:51 am

Hello.
We have encountered a rendering issue related to the world position of objects.
I brought some image for better understanding:

Selection_008.png
Render Image


Only a distant light and an environment light with checker map in it have been applied in this render.

There are only two types of the sphere in this image. One has red and blue checker map and covered by glass type sphere around it. The other sphere has a default SSS shader on it.

Two spheres at the bottom line have been positioned at (0,0,0) in world space. The render shows its shadings as expected.
Two spheres at the second line have been positioned at (0,0,10km) in world space. The checker map has been changed to complete black and SSS shader has been significantly darkened.
Two spheres at the top of the image have been positioned at (0,0,100km) in world space. Now the checker map is back, but color has been changed to black and white. The SSS shader has been changed to pitch black.
(update: I just realized that the checker map shown in top sphere is not from blue and red checker map inside. It is a refraction coming from environment light. It ignores inner sphere and refracts environment light coming from back of the glass sphere.)

The only difference between spheres is their world position, but the refraction of shader and SSS shader has been changed for some reason.

I have included the project file so you can recreate this issue for further investigation.

Thanks.
Attachments
test_position.project
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Re: rendering issue related to the world position of objects

Unread postby dboude » Fri Mar 15, 2019 9:31 am

Hi,

Thanks for reporting that. I will have a look.

Cheers ;)
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Re: rendering issue related to the world position of objects

Unread postby dboude » Fri Mar 15, 2019 10:07 am

Could you please use the Bug Tracker to report this bug?

Thank you !

btw : In the scene you shared, the spheres are at 1000 km and 10 000 km but nevermind, I confirm, precision issues are there. It's quite normal but we'll see if we can enhance this.
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Re: rendering issue related to the world position of objects

Unread postby Kramon » Fri Mar 15, 2019 3:10 pm

is there known safe range?
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Re: rendering issue related to the world position of objects

Unread postby dboude » Fri Mar 15, 2019 5:40 pm

In my test, render starts to go weird slowly above 10km from the center. (10 000 units)
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Re: rendering issue related to the world position of objects

Unread postby nareineru » Wed Mar 20, 2019 4:40 am

Thank you for your quick responses! I really hope we can improve and resolve this issue. :)
I will keep posting updates if there's any.
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Re: rendering issue related to the world position of objects

Unread postby dboude » Wed Mar 20, 2019 9:33 am

For now, you can parent everything to a locator a "re-center" the whole scene near the world origin.

Cheers ;)
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Re: rendering issue related to the world position of objects

Unread postby nareineru » Fri May 17, 2019 9:08 am

Do you mean parenting everything in the scene, including a camera, to a single locator and move it to the world origin? I think that is one clever way to workaround, but because of the complexity of our current projects, I don't think the suggested workaround is viable, unfortunately. :( But I really appreciate your suggestion! :D

Are developers at Isotropix actively working on this issue, or has it already been fixed in the latest Clarisse?
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Re: rendering issue related to the world position of objects

Unread postby dboude » Fri May 17, 2019 10:05 am

Unfortunately, this is really hard to fix. I can't give you an ETA.

If your projects are well organized, the brute force parenting shouldn't be a problem. The only thing you have to care about is to not parent objects that are used in scatterers combiners.

You can use the search text field in the browser to get all the objects that are called by the layers. Let's say my project looks like this :

Image

I have to dive in the render context, type * in the search field, select all the objects and parent them to a locator.

Sorry for the inconvenience, hope you'll be able to do this.

Cheers ;)
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Re: rendering issue related to the world position of objects

Unread postby dboude » Fri May 17, 2019 11:03 am

Another solution came in mind. You can create a combiner and combine the whole scene, parent the camera to the combiner and place the combiner in the center of the world. It might be more elegant ;)
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