Export material animation

[y-khodja]

Is your feature request related to a problem? Please describe.
Hello,

I am actually trying to export animated propreties from materials with NLA into an extension. I could manage to make it work with some hooks in Blender 3.3LTS. I am trying to make it work with Blender 3.6LTS but the thing is that the code has changed a lot and i am a little bit stuck in:

• io_scene_gltf2\blender\exp\animation\gltf2_blender_gather_tracks.py line 113
  the problem here is that the type i have added in tracks is 'MATERIAL'. You code manage 'OBJECT' or shape_keys. the NLA here is in the material_slots of the blender_object. Both line 111 and 117 will crash in my case.

Describe the solution you'd like
Is there a way to manage the shape keys with and "elif" and let the else become anything else ? Or do you have any other idea to get this exported ?

Additional context
The addon i'm working helps third parties to export glTF for Microsoft Flight Simulator game by adding extensions in the right places.

Thank you !

[julienduroure]

If you want to use KHR_animation_pointer to export these material properties, you should use Blender 4.2.x and enable the option (using Scene or NLA Track animation mode)

[y-khodja]

Actually i am trying to manage to get it work without your sampling (by sampling the material animations in 'gather_actions_hook' and 'gather_tracks_hook'. Because we already have an extension to manage those kind of animations in our engine. To give an example of what it looks like:

{
            "channels" : [
                {
                    "sampler" : 3,
                    "target" : {
                        "node" : 0,
                        "path" : "scale"
                    }
                }
            ],
            "extensions" : {
                "ASOBO_property_animation" : {
                    "channels" : [
                        {
                            "sampler" : 0,
                            "target" : "materials/0/pbrMetallicRoughness/baseColorFactor"
                        },
                        {
                            "sampler" : 1,
                            "target" : "materials/0/pbrMetallicRoughness/roughnessFactor"
                        },
                        {
                            "sampler" : 2,
                            "target" : "materials/0/pbrMetallicRoughness/metallicFactor"
                        }
                    ]
                }
            },
            "name" : "MaterialAnimation",
            "samplers" : [
                {
                    "input" : 4,
                    "interpolation" : "LINEAR",
                    "output" : 5
                },
                {
                    "input" : 4,
                    "interpolation" : "LINEAR",
                    "output" : 6
                },
                {
                    "input" : 4,
                    "interpolation" : "LINEAR",
                    "output" : 7
                },
                {
                    "input" : 8,
                    "interpolation" : "STEP",
                    "output" : 9
                }
            ]
        }

We want to support all LTS versions of Blender, so i'll have to make it work for 3.6 and 4.2 😊

Thank you for your response 😄 !