Excuse me, the GLB and FBX format models I exported from Blender are complete when viewed in both the 3D viewer and Blender, but when imported into PlayCanvas, this becomes the case. Can a skilled model expert identify any issues.
From the screenshot it seems the model is inverted inside-out? Perhaps this could help if that is the case: Flip Normals (inverted faces) – Blender Knowledgebase
Thank you, it is indeed this problem, I solved it in blender