Smoothing group export about gltf-blender-exporter HOT 11 CLOSED

Okay, this should fix it:
d9451cd

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Generally, it is working (this is another, similar scene):

But when I export your scene, the information gets lost. Let me check.

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Okay, got it. I am setting the faces smooth, not the edges.

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Thanks for the fix!

I've tested it on me scenes and it works but I faced with another issue. In case of I'm disabling auto smooth then time of export significantly increases. For instance: I have the scene with 71k faces (26 objects) export auto smooth takes about 5 seconds and with auto smooth takes about 15 minutes.

Could you please take a look at it? Maybe we need to create another issue?

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The problem is - if auto smooth is enabled - the exporter has to scan each edge of the polygon.
I will create a ticket for this, as an enhancement.
Also, please note, that smoothing the faces has the same effect and the export should be much faster:

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Issue added here:
#26

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Also, if you can share the scene, please go ahead.
If you can not share the scene, maybe you can profile yourself, where the real bottle-neck is?
With profile_start() and profile_end() you can instrument the Python code. The result is printed out in the Blender console.

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I've add some profilers in exported code and figured out that the bottle-neck is:

if blender_mesh.use_auto_smooth:
    for edge_key in blender_polygon.edge_keys:
        blender_edge = blender_mesh.edges[blender_mesh.edge_keys.index(edge_key)]

        if blender_edge.use_edge_sharp:
            use_sharp = True
            break 

In case of disabled auto smooth time to convert polygon to primitive indices is 6.985664367675781e-05 seconds and with enabled auto smooth is 0.012976884841918945 seconds. So if we have scene with 2048 polygons that we get next timings:

2048 * 6.985664367675781e-05 = 0,1430664062
2048 * 0.012976884841918945 = 26,5766601562

Also, please note, that smoothing the faces has the same effect and the export should be much faster

I actually use next pipeline: 3d Max -> export FBX -> Blender -> Import FBX -> Export glTF; I'm not sure that FBX accept smoothing the faces I will check it.

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I added an option (not uploaded yet), where you can disable the auto smooth check.
At a later point of time, I will check, how this can be made faster.

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This scene seems have incorrect normals after export. Could you take a look?

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In the above two images (Blender render and my internal renderer), auto smooth is disabled. The output seems to be correct. We will have a look at it, when auto smooth is enabled. But it will be an enhancement, as you can get the same result with another approach.

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