export GLScene to 3D-PDF (IDTF file format, TGLIDTFVectorFile)

[Dirk C]

Hello,

I'm looking forward to export a Scene to a 3D PDF. The valid formats are U3D and PRC, for U3D creation there is a converter available (Universal 3D Sample Software on SF). The input format is IDTF (intermediate text format). So basic workflow is

glScene -> IDTF -> U3DConverter -> U3D data stream -> embedding in 3D PDF annotation.

Meshlab can already save this format (nice for comparing) but i want to do it in Delphi.
I made a custom filer derived from TGLVectorFile but i'm not so firm in converting the MeshObjects to IDTF.
I can export the FACE/VERTICIES but e.g not the MODEL_NORMAL_LIST.
I made a Delphi XE 10 sample and uploaded it here:

https://drive.google.com/open?id=0Bx84-peUdIgZeUZWX0Z6YU0taUE

Can anybody help me in saving the meshobjects to IDTF?
Thanks & best regards
Dirk

Basic structure of IDTF: Simple ASCII format, for a pyramid it looks like this:

FILE_FORMAT "IDTF"
FORMAT_VERSION 100

NODE "MODEL" {
    NODE_NAME "VcgMesh01"
    PARENT_LIST {
        PARENT_COUNT 1
        PARENT 0 {
            PARENT_NAME "<NULL>"
            PARENT_TM {
                1.000000 0.000000 0.000000 0.000000
                0.000000 1.000000 0.000000 0.000000
                0.000000 0.000000 1.000000 0.000000
                0.000000 0.000000 0.000000 1.000000
            }
        }
    }
    RESOURCE_NAME "MyVcgMesh01"
}

RESOURCE_LIST "MODEL" {
    RESOURCE_COUNT 1
    RESOURCE 0 {
        RESOURCE_NAME "MyVcgMesh01"
        MODEL_TYPE "MESH"
        MESH {
            FACE_COUNT 8
            MODEL_POSITION_COUNT 4
            MODEL_NORMAL_COUNT 24
            MODEL_DIFFUSE_COLOR_COUNT 0
            MODEL_SPECULAR_COLOR_COUNT 0
            MODEL_TEXTURE_COORD_COUNT 0
            MODEL_BONE_COUNT 0
            MODEL_SHADING_COUNT 1
            MODEL_SHADING_DESCRIPTION_LIST {
                SHADING_DESCRIPTION 0 {
                    TEXTURE_LAYER_COUNT 0
                    SHADER_ID 0
                }
            }
            MESH_FACE_POSITION_LIST {
                0 1 2
                2 1 0
                2 3 0
                0 3 2
                3 1 0
                0 1 3
                3 2 1
                1 2 3
            }
            MESH_FACE_NORMAL_LIST {
                0 1 2
                3 4 5
                6 7 8
                9 10 11
                12 13 14
                15 16 17
                18 19 20
                21 22 23
            }
            MESH_FACE_SHADING_LIST {
                0
                0
                0
                0
                0
                0
                0
                0
            }
            MODEL_POSITION_LIST {
                -39.999969 547.999878 0.000000
                -39.999969 647.999878 0.000000
                -39.999969 547.999878 100.000000
                -140.000000 547.999878 0.000000
            }
            MODEL_NORMAL_LIST {
                1.000000 0.000000 0.000000
                1.000000 0.000000 0.000000
                1.000000 0.000000 0.000000
                -1.000000 0.000000 0.000000
                -1.000000 0.000000 0.000000
                -1.000000 0.000000 0.000000
                -0.000000 -1.000000 0.000000
                -0.000000 -1.000000 0.000000
                -0.000000 -1.000000 0.000000
                -0.000000 1.000000 0.000000
                -0.000000 1.000000 0.000000
                -0.000000 1.000000 0.000000
                -0.000000 0.000000 -1.000000
                -0.000000 0.000000 -1.000000
                -0.000000 0.000000 -1.000000
                -0.000000 0.000000 1.000000
                -0.000000 0.000000 1.000000
                -0.000000 0.000000 1.000000
                -0.577350 0.577350 0.577350
                -0.577350 0.577350 0.577350
                -0.577350 0.577350 0.577350
                0.577350 -0.577350 -0.577350
                0.577350 -0.577350 -0.577350
                0.577350 -0.577350 -0.577350
            }
        }
    }
}

[Dirk C]

Sorry, i posted the wrong link to sample project, corrected now:
https://drive.google.com/open?id=0Bx84-peUdIgZeUZWX0Z6YU0taUE

[Jerome.D (BeanzMaster)]

Hello Dirk, nice thanks will include to the SVN as soon as possible

Cheers

[Dirk C]

Hi Jerome,
thank's! Feel free to integrate the IDTF/U3D vectorfile into GLScene!
I made some progress and now i can create valid PDF 3D files. I want to refactor some methods and will setup a github account. Currently some parts missing like initial view (camera position), materials/shadings. What is the best way to sync development and allow others to contribute?

Best regards
Dirk

[Jerome.D (BeanzMaster)]

Hi Dirk, yes with Pavel will can give an access to the SVN. I'll send you private mail this week end i'll have more time.

[Dirk C]

Hi Jerome, that sounds good! Looking forward,
Dirk

[Pavel Vassiliev]

Dirk,
I've included your GLFile3DPDF unit. Thanks. But what about IDTFConverter dlls. Do they necessary to export and need to be included in externals libs too? And may be you have also a code to import/export glTF for GLScene like a converter in https://github.com/KhronosGroup/glTF#converters or loader https://github.com/KhronosGroup/glTF-CSharp-Loader.