stop auto recalculate vertex normal

Coding Python Support
1

I’ve read that blender is almost constantly auto recalculating vertex normals. I’ve written a small script to change the vertex normals but unfortunately when I export my model I loose the changes I’ve made because blender recalculated the normals. Is there anything I can do to stop blender from auto recalculating vertex normals?

I am aware that someone built a mod into a cust. build of blender but unfortunately that was for 2.49/2.5 and I need a later version as I need to export to .fbx

2

Is there anything I can do to stop blender from auto recalculating vertex normals

No. You may wanna search the forums for this topic, there are several addons already. The only option is to store the custom normal elsewhere and restore it on user request (e.g. before export).