Build modifier build group of faces?

Hello all,
I have a difficult question about the build modifier: I’m making a freestyle presentation of a solid that need to be displayed showing the inner sections made by reuleaux triangles


As you can see from the image, showing the problem occuring in several frames, the build modifier builds face by face following the face order and can’t be told, as far as I know, to build by group of faces (section by section in my case).
The blue lines were marked as freestyle edges, the black lines shows the countour and unfortunatly also the tip where the build modifier it’s caught in that frame building the face but hasn’t quite finished. Each section have 60 face

I wish I could render the solid growing section by section not face by face, but I don’t know any other way I could accomplish this
Any idea blender genius? :smiley:

JA12 great idea !!! I didn’t thought about it!
Thanks man!!!