There is any way to apply trasnform matrix set model?

[learnerandtrainer]

Hi, I have a b3dm model that created by sharp gltf and one json file that cantains transform parameter for cesium to load my b3dm. whenI want to preview every think is okey. But I want to set my transform parameter into b3dm(glb) itself because cesium transform my other child geometries using root and childs parameters. I used model.ApplyBasisTransform function but it doesnt work. Is there any way to transform model by trasnform matrix? Here my example files 157146.zip

[vpenades]

Not sure which would be the solution, since b3dm is beyond the scope of SharpGLTF.

I suspect the problem lies in that b3dm uses the internal meshes of a glTF, but not the transforms, which are overriden by b3dm. If that's the case, changing the transforms of the nodes in the gltf (as ApplyBasisTransform does) will take no effect.

[learnerandtrainer]

Hi vpenades, do you have any idea about trasnform tringles by trasnform matrix before set them into gltf?

[vpenades]

I think the best approach is this:

You have to "transfer" the mesh resources from one glTF to another, applying a mesh transform in between.

there is a unit test that does something like that here

Essentially, you create a new SceneBuilder, and you add the meshes from the source glTF to the destination SceneBuilder, applying a transform matrix, Then, you can save the SceneBuilder as a glTF

[learnerandtrainer]

Hi vpenades, I cant combine them in a new one because they have different trasnform values. for this scenario I have to trasnform geometries by their transform parameter before save them as gltf. I dont know cesium how calculate geometries by transform at runtime. I asked them but didnt get answer yet. I suppose that it is a bit complex. But I find new solution to merge them without calculating geometries by transform. I took center point of 15 level for 15,17,18 levels. And then translated all levels by this center point . This helped identify a single conversion for all levels . After that I could add levels as upper level child and set trasnform to only root element. Thank you for answers