b3dm with multiple textures

Benjamin

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Mar 1, 2016, 7:33:25 AM3/1/16

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Hello,

is it possible to use multiple textures in a b3dm?

One mesh with different primitives, which are using the same accessors, but a different indices accessor. Like this:

    "meshes": {
        "Cube-mesh": {
            "name": "Cube",
            "primitives": [
                {
                    "attributes": {
                        "NORMAL": "accessor_45",
                        "POSITION": "accessor_43",
                        "TEXCOORD_0": "accessor_47"
                    },
                    "indices": "accessor_38",
                    "material": "Material1-effect",
                    "mode": 4
                },
                {
                    "attributes": {
                        "NORMAL": "accessor_45",
                        "POSITION": "accessor_43",
                        "TEXCOORD_0": "accessor_47"
                    },
                    "indices": "accessor_41",
                    "material": "Material2-effect",
                    "mode": 4
                }
            ]
        }
    },

I know using a texture atlas would be the best solution, but I have data in which one building uses more than one texture atlas.

Patrick Cozzi

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Mar 2, 2016, 10:30:19 AM3/2/16

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Hi Benjamin,

Yes, this should work. It requires different materials for each primitive, which your example shows.

To help debug this, have you tried to load the same glTF model separate from a b3dm file?

Also, check out this thread, and let me know if you want me to include your 3D Tiles work in my OGC talk next week.

Patrick

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Benjamin

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Mar 2, 2016, 11:13:41 AM3/2/16

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Thanks!

The example was just a test, what the cesium COLLADA to glTF Converter does, when converting a mesh with two textures.

I am writing an glTF exporter, that should also export b3dm in the near future and this was kind of a design question.

3D Tiles is not implemented, yet. The exporter has to be finished first, but this is my bachelor "internship like" project.

Patrick Cozzi

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Mar 2, 2016, 1:41:44 PM3/2/16

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Ah, cool. What tool are you writing the glTF exporter for?

Patrick

On Wed, Mar 2, 2016 at 11:10 AM, Benjamin Abb <benn...@gmail.com> wrote:

Thanks!
The example was just a test, what the cesium COLLADA to glTF Converter does, when converting a mesh with two textures.
I am writing an glTF exporter, that should also export b3dm in the near future and this was kind of a design question.

3D Tiles is not implemented, yet. The exporter has to be finished first, but this is my bachelor "internship like" project.

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twitter.com/pjcozzi

Benjamin

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Mar 2, 2016, 2:03:56 PM3/2/16

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For a geo tool of the Fraunhofer IGD.

Am Dienstag, 1. März 2016 13:33:25 UTC+1 schrieb Benjamin:

Patrick Cozzi

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Mar 2, 2016, 4:29:01 PM3/2/16

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Ah, very cool. I have been working with Fraunhofer a lot on glTF.

Patrick

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