need materials help

[egidio]

Hello all!

 

This is my first post, and my first attempt of making interior scene. I was using c4d 9.5

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I have some beginner problems with lightning and materials.

 

Floor has too much reflection from outer light and none reflection of furniture. I put 4% reflection on floor. Would diffusion on floor help, or "generate gi" on the sky object?

 

Is difussion normaly used on wood materials?

 

I cannot get rid of rough shadow dots on doors and behind furniture on left.

 

I also cannot get nice spread soft light around light on the left above paintings(i used material with self illumination)

 

I have radiosity settings: strenght 100, acc70, difusedepht 3, ssamples 2500, min 17, max 300 resolution. I had rendertime 13h on 1024x650px

 

Oh, and i put bump on all walls, is it actually necessary on none-closeup scene?

 

Thanks!

[AJLynn]

I don't think bumpmapping the walls is necessary, they have a good feel already. A couple things I can tell you right off-

 

Try this with Multi-Pass Rendering turned on, choose Add Image Layers and save as a Photoshop File with the Photoshop 7 option turned on. Reflections will be a layer and you can turn it down or up, or manipulate (try smudge) the layer to blur the reflection a bit (do something about the glass table reflection too) - but I think the reflect levels are almost correct already, sky with the sun or a bright cloud in the place being reflected is bright enough to overpower the rest. The HDR outside isn't great, I think it's not applied correctly. I think this is a big part of your problem - it's low res, or maybe a normal shot applied as a sphere map, and a little too bright for the reflection.

 

Also, you can drop the radiosity settings and use Photoshop to fix the artifacts. There's a great DVD tutorial on this stuff from 3dfluff, called Radiosity Interiors, that you might find helpful.

 

Aside from the obvious problems it's really good, especially for a first attempt.

[egidio]

Thank you for suggestions!

 

I rendered in multi pass .psd file with "all image layers" turned on.

 

But there are new artifact like white outlines around objects in duiffuse layer.

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When i save image in "tiff, without multi pass" everything is ok(picture below).

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Please help!

 

Tilen

[Wokka]

I just did a quick experiment and had the same problem.

It seems to be in the shadow layer of the psd.

I'll try some more test's, but it's definitley different to my old R9 results and my old R7 model I needed to re-render.

[egidio]

Yes, I did some additional tests and it is Shadow layer which affects Diffuse layer. Is it possible that photoshop cs2 has difficulties reading ps7 layers?

 

Rough solution is that you go over all edges with "brush tool" and "color burn" function:)

 

Does anyone knows any solution how to fix this, its realy annoying to me, I feel very limited without multy pass renders now.

[AJLynn]

This is a known problem, they talk about it in a 3DFluff video and their advice is to Photoshop it.

[edub]

Is this a problem with only with CS? does it not show up in pshop7 ?

 

This is really a bug that should be fixed ASAP

 

In which Fluff video do they mention this?

[AJLynn]

It was the one on interior radiosity rendering. It's not a bug in a PS version - the image is written to the PS file with the problems in it.

[ramses2028]

For your artifacts problem, increase the max in radiosity settings. Too many samples, it's not useful, I think 500 may be enough. Reflection of the floor might be increased too. 4% is not enough.