Passing alpha values through filters in JME 3.1

Troubleshooting graphics
1

Hi,

I am about to migrate to 3.1 and have a problem that I did not have with 3.0. I use a FilterPostProcessor as an atmospheric scattering and fog filter. It paints the color of the atmosphere and fog in the RGB components, and the “transparency” (=transmittance) of the atmosphere in the alpha component. I used to read this alpha value in another filter to render lights at certain intensities, i.e. the light intensity is a function of the transmittance.
The problem is, that in 3.1 the alpha value is not passed to the next filter(s). I assume that this is because the FilterPostProcessor uses Image.Format.RGB111110F in 3.1, while it used to be RGBA8 (or something similiar) in 3.0.

Is there anybody out there, who knows a trick to solve this problem?

2

I also encounter a transparent problem. Detail is I load an obj model, and set it transparent(BlendMode.Alpha, setMaterialTransparent, setQueueBucket(Bucket.Transparent)).
Then I add a skybox.
In 3.0 I can set skybox through the model, in 3.1 I can see viewport background color through the model.
But when I use jme’s Box ,Quad by new mesh, or load blender model, it’s ok in 3.1.

3

RGB111110F is used now because it allows for more precision on the color channels, at the expanse of…well the alpha channel… resulting in your issue :stuck_out_tongue:
I realize I could have made a fallback, maybe a constructor with the format so people could still use RGBA8 if they wanted.

For now what you can do though as a hackish workaround is to try to remove the PackedFloatTexture from the render caps. If they are not supported, the FPP falls back to RGBA8.

renderManager.getRenderer().getCaps().remove(Caps.PackedFloatTexture);

Tell me if it works.

This is absolutely not related with the original issue, please make your own topic.

4

Thank you for your reply.

Unfortunately it doesn’t work. In the FilterPostProcessor the fallback is:

if (!renderer.getCaps().contains(Caps.PackedFloatTexture)) {
    fbFormat = Format.RGB8;
}

That would be perfect. I guess there is something like RGBA16, which I’d like to use. :wink:

5

oh… I overlooked the RGB NOT-A 8… Yeah sorry.
I will do some thing like I said.

1 Like
6

Thank you very much.