Blender LÖVE2D 3D Mesh Exporter

addon.py

import struct

import bpy
from bpy_extras.io_utils import ExportHelper

bl_info = {
    "name": "LÖVE Mesh Binary Exporter",
    "author": "TurtleP",
    "version": (1, 0),
    "blender": (3, 0, 0),
    "location": "File > Export",
    "description": "Export a mesh as a flat binary for a LÖVE Mesh",
    "category": "Import-Export",
}


class ExportLoveMesh(bpy.types.Operator, ExportHelper):
    bl_idname = "export_mesh.love_mesh"
    bl_label = "Export MSH"
    filename_ext = ".msh"

    def get_uvs(self, layer, index):
        if layer is not None:
            return layer.data[index].uv
        return [0.0, 0.0]

    def get_color(self, layer, index):
        if layer is not None:
            return layer.data[index].color
        return [1.0, 1.0, 1.0, 1.0]

    def execute(self, context):
        obj = bpy.context.active_object
        if not obj or obj.type != "MESH":
            raise RuntimeError("Select a mesh object")

        mesh = obj.to_mesh()
        mesh.calc_loop_triangles()

        out = bytearray()
        VERTEX_FMT = "<fffffffff"  # xyz uv rgba

        uv_layer = mesh.uv_layers.active
        color_layer = mesh.vertex_colors.active

        for tri in mesh.loop_triangles:
            for loop_index in tri.loops:
                loop = mesh.loops[loop_index]
                vert = mesh.vertices[loop.vertex_index]

                pos = vert.co
                uv = self.get_uvs(uv_layer, loop_index)
                color = self.get_color(color_layer, loop_index)
                out += struct.pack(VERTEX_FMT, pos.x, pos.y, pos.z, *uv, *color)

        with open(self.filepath, "wb") as f:
            f.write(out)

        self.report({"INFO"}, f"Exported {len(out)} bytes")
        return {"FINISHED"}


def menu_func_export(self, context):
    self.layout.operator(ExportLoveMesh.bl_idname, text="MSH")


def register():
    bpy.utils.register_class(ExportLoveMesh)
    bpy.types.TOPBAR_MT_file_export.append(menu_func_export)


def unregister():
    bpy.types.TOPBAR_MT_file_export.remove(menu_func_export)
    bpy.utils.unregister_class(ExportLoveMesh)


if __name__ == "__main__":
    register()