when i enter decalMesh.sourceMesh, it returns undefined
After creation, a decal mesh is no different than a regular mesh. If you want to retrieve the parameters you used to create it, you should store them somewhere. For eg, on the decal mesh itself:
const decalMesh = ...; // create the decal mesh
decalMesh.decalSize = size;
decalMesh.decalAngle = angle;
...
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Thank you so much for the reply