Alpha channel slider

[jaimeef]

Hello!

I wonder if someone might be able to help me with a school project I am doing.. I have a model with three different objects, each with their own material. I would like to be able to include a slider which allows the viewer to adjust the alpha individually for each of the three objects (they overlay each other).

I can see the sliders here to change the roughness/metalness https://modelviewer.dev/examples/scenegraph/#changeMaterial but I wonder whether I can target each material individually to change the alpha in a similar manner.

Any tips or points in the right direction would be greatly appreciated!

[elalish]

Yes, that should work just fine. You may want getMaterialByName which you can find in the material API. Keep in mind that rasterizers don't always do an amazing job of rendering stacks of transparent things.

[jaimeef]

Thank you so much! I have managed to call the materials and apply the alpha mode to blend, however I cannot see which function targets the Alpha Factor. I can only seem to change the mode, and the Alpha cutoff (which I don't think is what I want here

)

[elalish]

alpha is the fourth element of baseColorFactor (since it can also be textured).

[jaimeef]

Ah oh course. Thank you very much!