T63489: Wrong transparent node setup in GLTF import

[julienduroure]

See Blender issue tracker for info / file / screenshots:
https://developer.blender.org/T63489

[julienduroure]

I not agree with the analysis.
Factor of the mixShader node will do the following : 1 for transparent, 0 for opaque.
The Add node is used as factor. So if you have an alpha of 0.2, you have to set factor to 0.8.
The second image is wrong, because add 0.8 and 0.2 --> full transparent because of factor of 1.0

[nurbs999]

Hmm, strange. My threejs scene, where I do the gltf export from, has an almost full transparent object.

[Zool1987]

I have the same problem ... And another question on the topic is it possible to use a gradient in texture? Now I only have a blend mode without texture in my shader Principle BSDF...I want to get a glass with a transparency gradient (opaque at the bottom, transparent at the top) With the old shader I did it, but with Principle BSDF does not work = (If you can do this, you can share the node scheme?

[julienduroure]

I have to check if we can use transmission value of principled shader instead of mix with transparent node.
Set as enhancement

[julienduroure]

This very recent change in Blender will maybe help us :
https://developer.blender.org/rB8f71a84496a95528303fbe0bb7c1406060353425

See #462

[Zool1987]

It's great that these entrances have appeared, but GLTF exports are not working as expected. Gradient texture with transparency, after export, loses the alpha channel. We are waiting for this fix.
alpha_test.zip

[julienduroure]

@Zool1987 These new entrances are not taken into account in this addon yet, so please be patient, we will work on it

[Zool1987]

Thank you very much for your work, you are doing a great job!

[scurest]

I think the original setup was already correct, but anyway the Alpha socket is used now. Might be able to close this.