OpenSceneGraph's Ascii format, with normal and tangent data

[scanline]

I'm working on an exporter for the .osgt format and have a little trouble getting things to look correct - probably because I'm not completely sure about the file format's structure/syntax.
If the model just consists of vertex (VertexArray) and uv (TexCoordArrayList) data everything's okay but as soon as there's normal (NormalArray) and tangent (TangentArray) data, osgviewer seems to ignore it or simply skips the uv section.

What could possibly be wrong with a file like this:

#Ascii Scene
#Version 161
#Generator OpenSceneGraph 3.5.6
osg::Group {
  UniqueID 1
  Children 1 {
    osg::Group {
      UniqueID 2
      Name "Root"
      Children 1 {
        osg::MatrixTransform {
          UniqueID 3
          Name "Cube"
          Children 1 {
            osg::Geode {
              UniqueID 4
              Name "GeodeCube"
              Drawables 1 {
                osg::Geometry {
                  UniqueID 5
                  Name "Test"
                  StateSet TRUE {
                    osg::StateSet {
                      UniqueID 6
                      Name "Test"
                      AttributeList 1 {
                        osg::Material {
                          UniqueID 7
                          Name "Test"
                          Shininess TRUE Front 10 Back 10
                          Ambient TRUE Front 0 0 0 1 Back 0 0 0 1
                          Diffuse TRUE Front 0.64 0.64 0.64 1 Back 0.64 0.64 0.64 1
                          Emission TRUE Front 0 0 0 1 Back 0 0 0 1
                          Specular TRUE Front 0.5 0.5 0.5 1 Back 0.5 0.5 0.5 1
                        }
                        Value OFF
                      }
                      TextureModeList 1 {
                        Data 1 {
                          GL_TEXTURE_2D ON
                        }
                      }
                      TextureAttributeList 1 {
                        Data 1 {
                          osg::Texture2D {
                            UniqueID 8
                            WRAP_S REPEAT
                            WRAP_T REPEAT
                            MIN_FILTER LINEAR_MIPMAP_LINEAR
                            MAG_FILTER LINEAR
                            Image TRUE {
                              ClassName osg::Image 
                              UniqueID 9
                              FileName "texture.png"
                              WriteHint 0 2
                              DataVariance STATIC
                            }
                          }
                          Value OFF
                        }
                      }
                    }
                  }
                  PrimitiveSetList 1 {
                    osg::DrawElementsUShort {
                      UniqueID 11
                      Mode TRIANGLES
                      vector 36 {
                        0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
                      }
                    }
                  }
                  VertexArray TRUE {
                    osg::Vec3Array {
                      UniqueID 12
                      Binding BIND_PER_VERTEX
                      vector 12 {
                        0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
                      }
                    }
                  }
                  TangentArray TRUE {
                    osg::Vec4Array {
                      UniqueID 13
                      Binding BIND_PER_VERTEX
                      vector 48 {
                        0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
                      }
                    }
                  }
                  NormalArray TRUE {
                    osg::Vec3Array {
                      UniqueID 14
                      Binding BIND_PER_VERTEX
                      vector 36 {
                        0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
                      }
                    }
                  }
                  TexCoordArrayList 1 {
                    osg::Vec2Array {
                      UniqueID 15
                      Binding BIND_PER_VERTEX
                      vector 12 {
                        0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
                      }
                    }
                  }
                }
              }
            }
          }
          Matrix {
            1 0 0 0 0 1 0 0 0 0 1 0 0 0 0 1
          }
        }
      }
    }
  }
}

[LaurensVoerman]

For the per vertex data the vector sizes must be identical. combining different sizes makes no sense. The indices in DrawElementsUShort should range from 0 to this vector size. Regards, Laurens.

…

On Thu, Feb 13, 2025 at 4:01 PM scanline ***@***.***> wrote: I'm working on an exporter for the .osgt format and have a little trouble getting things to look correct - probably because I'm not completely sure about the file format's structure/syntax. If the model just consists of vertex (VertexArray) and uv (TexCoordArrayList) data everything's okay but as soon as there's normal (NormalArray) and tangent (TangentArray) data, osgviewer seems to ignore it or simply skips the uv section. What could possibly be wrong with a file like this: #Ascii Scene #Version 161 #Generator OpenSceneGraph 3.5.6 osg::Group { UniqueID 1 Children 1 { osg::Group { UniqueID 2 Name "Root" Children 1 { osg::MatrixTransform { UniqueID 3 Name "Cube" Children 1 { osg::Geode { UniqueID 4 Name "GeodeCube" Drawables 1 { osg::Geometry { UniqueID 5 Name "Test" StateSet TRUE { osg::StateSet { UniqueID 6 Name "Test" AttributeList 1 { osg::Material { UniqueID 7 Name "Test" Shininess TRUE Front 10 Back 10 Ambient TRUE Front 0 0 0 1 Back 0 0 0 1 Diffuse TRUE Front 0.64 0.64 0.64 1 Back 0.64 0.64 0.64 1 Emission TRUE Front 0 0 0 1 Back 0 0 0 1 Specular TRUE Front 0.5 0.5 0.5 1 Back 0.5 0.5 0.5 1 } Value OFF } TextureModeList 1 { Data 1 { GL_TEXTURE_2D ON } } TextureAttributeList 1 { Data 1 { osg::Texture2D { UniqueID 8 WRAP_S REPEAT WRAP_T REPEAT MIN_FILTER LINEAR_MIPMAP_LINEAR MAG_FILTER LINEAR Image TRUE { ClassName osg::Image UniqueID 9 FileName "texture.png" WriteHint 0 2 DataVariance STATIC } } Value OFF } } } } PrimitiveSetList 1 { osg::DrawElementsUShort { UniqueID 11 Mode TRIANGLES vector 36 { 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 } } } VertexArray TRUE { osg::Vec3Array { UniqueID 12 Binding BIND_PER_VERTEX vector 12 { 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 } } } TangentArray TRUE { osg::Vec4Array { UniqueID 13 Binding BIND_PER_VERTEX vector 48 { 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 } } } NormalArray TRUE { osg::Vec3Array { UniqueID 14 Binding BIND_PER_VERTEX vector 36 { 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 } } } TexCoordArrayList 1 { osg::Vec2Array { UniqueID 15 Binding BIND_PER_VERTEX vector 12 { 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 } } } } } } } Matrix { 1 0 0 0 0 1 0 0 0 0 1 0 0 0 0 1 } } } } } } — Reply to this email directly, view it on GitHub <#1358>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AEXFTWX4Z7VDQ6MUVEQXYB32PSXTNAVCNFSM6AAAAABXCMX6MGVHI2DSMVQWIX3LMV43ERDJONRXK43TNFXW4OZXHE3DCNBYHA> . You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>

[scanline]

Thanks Laurens!

Do you happen to have a sample .osgt file utilizing a NormalArray & TangentArray I could study?

[LaurensVoerman]

Attached is an osgt file using osgFX::BumpMapping, which needs normals, binormals and tangents as vec4 on vertex attributes 6,7 and 15. The textures (whitemetal_normal.jpg and whitemetal_diffuse.jpg) are part of openscengraph data <https://github.com/openscenegraph/OpenSceneGraph-Data>. Regards, Laurens.

…

On Thu, Feb 13, 2025 at 8:08 PM scanline ***@***.***> wrote: Thanks Laurens! Do you happen to have a sample .osgt file utilizing a NormalArray & TangentArray I could study? — Reply to this email directly, view it on GitHub <#1358 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AEXFTWQDNNUGIJ4DZYUMV6T2PTUT5AVCNFSM6AAAAABXCMX6MGVHI2DSMVQWIX3LMV43URDJONRXK43TNFXW4Q3PNVWWK3TUHMYTEMJZGE4DENY> . You are receiving this because you commented.Message ID: <openscenegraph/OpenSceneGraph/repo-discussions/1358/comments/12191827@ github.com>