[Question] top-level matrix in tileset.json has rotation defined

[Rakiah]

Hello,

thank you for the tool, i'm currently trying to rotate my model once displayed on the map, as such I was playing with the tileset.json file top-level matrice and noticed something strange,

this tool explains that only transformation is applied (to go from local coordinates to ECEF coordinates) however the matrix has predefined values on rotation parts

shouldn't the matrix be as following ?

1 0 0 0 0 1 0 0 0 0 1 0 tX tY tZ 1

could you explain why isnt that the case and how would I go about applying custom rotation ?

[HeDo88TH]

Check out the official documentation: https://github.com/CesiumGS/3d-tiles/tree/main/specification#transforms And how the calculations are made by Obj2Tiles: https://github.com/OpenDroneMap/Obj2Tiles#rotating-the-model Some math refresh https://www.brainvoyager.com/bv/doc/UsersGuide/CoordsAndTransforms/SpatialTransformationMatrices.html