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[BrazilianBoy]

I managed to put a little sparkle on the screen using a texture that I made with Blender and a rect billboard. But if I don't use additive blending, the result won't look realistic. How can I turn it on (if it's currently possible)?

Lucas.

[Marvin Fröhlich]

I managed to put a little sparkle on the screen using a texture that I made with Blender and a rect billboard. But if I don't use additive blending, the result won't look realistic. How can I turn it on (if it's currently possible)?

I guess, you want to add an instance of TransparencyAttributes to the billboard's Appearance. This will enable OpenGL to correctly blend a (half) transparent texture.

Code:

bb.getAppearance().setTransparencyAttributes( new TransparencyAttributes( 0f ) );

should do the trick.

Marvin

[BrazilianBoy]

I guess, you want to add an instance of TransparencyAttributes to the billboard's Appearance. This will enable OpenGL to correctly blend a (half) transparent texture.

Not exactly. This is done. I want not to blend both the source and destination colors, but add them when writing to the color buffer. This add would never "fade" the colors when blending, then my sparkle would look like light, not a blurred point.


Lucas.

[Marvin Fröhlich]

Not exactly. This is done. I want not to blend both the source and destination colors, but add them when writing to the color buffer. This add would never "fade" the colors when blending, then my sparkle would look like light, not a blurred point.

Hmm... Wouldn't that mean to make the lightening "lines" opaque?

Well, I guess, you have to use RenderingAttributes and/or TextureAttributes. But I have never "really" used them. So I cannot provide you more tips than the JavaDocs will give you. Good luck .

Marvin

[BrazilianBoy]

Ok, I should think a little deeper before posting here. I've already found the solution.
I have to set the Dst blend factor to one.

Thank you