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Edmund Liang

Compositing Tag & Sky Object Problem

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Hi everyone!

 

I’ve been stunted by this problem and was wondering if anyone else has come across it. Hopefully, I can describe it correctly—attached is a sample scene. Should be able to see the problem as soon as you hit render.

 

SCENE:

Building with a figure and planters in a patio.

 

PROBLEM: 

After I've calibrated the camera and set up the planes for objects to cast shadows on (Compositing Tags set w/ Composite Background enabled), I usually put in some lights to light the objects. But I've recently tried using a Sky Object to light my scene. I love how the Sky object lights the objects more realistically. However, the Sky Object causes the planes with the Compositing Tag & Composite Background enabled to...reappear in the render as dark semi-transparent versions of themselves.

 

The planes with the compositing tag do not appear when I use regular lights though, just Sky Objects it seems. 

 

Has anyone else encountered this problem?

 

I’m running on Cinema4D R20 + Mac Mojave.

 

Thanks so much everyone!

Sample_01.jpg

C4DCafe_CompositingTag_01.zip

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the GI lighting in your scene multiplies over the background compositing. the planes become visible, because the GI shadow is visible on them.

the question is what do you want to achieve?

 

shall the walls emit light on the object?  

shall the object throw shadow on the environment?

 

This image shows the shadows:

 

gilight.thumb.png.77b59ee9d9d36c2a8446bfa9d161c828.png

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you can work around the issue with some tweaking. see different.zip
some workkaround steps:

- adjust GI Gamma, so lighting is more smooth

- blend of luminance and color channel, to decreae shadows

- adjusting of Matrerial : Illumination : GI Receive and GI throw settings + Saturation option

- adjusting of Material : Color Channel : Texture : Exposure

 

Of course the best solution would be a low poly reconstruction of the set + a Set HDR or at least some kind of Panorama

 

 

tweak.thumb.png.53fc2c6f5c2e1a2744c4ab502a4aa607.png

different.zip

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