Strange Problems with Transparent Background

This topic has 8 replies, 2 voices, and was last updated 6 years, 5 months ago by Ivan Lyubovnikov.

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2018-05-31 at 10:18 pm #4504

donalffons
Customer

Hi,

Here is a potential bug report.

I have two blend files, that contain pretty much the same items: A camera, a cube and a light. I then use the following code to make my background white:
app.scene.background = new THREE.Color(1,1,1);
The files give different results:
test123 works as expected, background is white (1,1,1)
test123-bug creates a slightly grey background color (…and has some other problems with transparency, but I think that’s related)

I greatly appreciate your support.

Cheers
-Sebastian

2018-06-01 at 1:46 pm #4554

Ivan Lyubovnikov
Staff

Hi Sebastian,

The difference is because of the SSAO postprocessing effect, which is enabled in test123-bug, but isn’t in test123. SSAO darkens the whole image a bit, that’s why the background is slightly grey.

But you’re right that it’s not what’s expected, because SSAO shouldn’t affect an empty background so much. We’ll make a fix for it by the next release. Until then, you can just disable this effect, it’s the Shading -> Ambient Occlusion option in the Properties Panel.

Co-founder and lead developer at Soft8Soft.

2018-06-01 at 2:56 pm #4555

donalffons
Customer

Hi Ivan, thanks a lot for your explanation!

I don’t find that option you mentioned. Here is how the render settings look like for me (still using Verge3d 2.3.1)

Maybe I just have to update to the new version?!

2018-06-01 at 3:11 pm #4556

Ivan Lyubovnikov
Staff

No, you don’t need to update, it’s in the other panel, they are just named the same for some reason:

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Co-founder and lead developer at Soft8Soft.

2018-06-01 at 3:16 pm #4559

Ivan Lyubovnikov
Staff

Ivan Lyubovnikov wrote:

it’s the Shading -> Ambient Occlusion option in the Properties Panel

yeah, my bad, I meant the Properties Shelf of course, not the Properties Panel

Co-founder and lead developer at Soft8Soft.

2018-06-01 at 3:53 pm #4560

donalffons
Customer

Thank you, Sir! That does the trick.

2018-06-01 at 3:55 pm #4561

Ivan Lyubovnikov
Staff

Glad to hear!

Co-founder and lead developer at Soft8Soft.

2018-06-01 at 4:20 pm #4562
donalffons
Customer
One more problem: If I have ambient occlusion turned on, then I cannot enable a transparent background any more with:
```
app.scene.background = null;
app.renderer.setClearColor(0x000000, 0);
```
The background will be black. It works if AO is disabled.

Do you know any workaround for this?
2018-06-04 at 1:21 pm #4590

Ivan Lyubovnikov
Staff

donalffons wrote:

The background will be black. It works if AO is disabled.

Yes, it’s a bug, we’ll fix it in the next release, thanks for reporting!
Regarding a workaround: unfortunately I don’t see a simple one, because the opaque background was hard-coded directly in the SSAO shader.

Co-founder and lead developer at Soft8Soft.
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