Update generate_book.py

generate_book.py

@@ -1,6 +1,6 @@
 import bpy, bmesh, json, sys, os, math
 
-# -------- parse args: blender -b -P generate_book.py -- --spec spec.json --out out_dir
+# --- parse args: blender -b -P generate_book.py -- --spec spec.json --out out_dir
 argv = sys.argv
 argv = argv[argv.index("--")+1:] if "--" in argv else []
 args = { argv[i].lstrip("-"): argv[i+1] for i in range(0, len(argv), 2) }
@@ -9,43 +9,43 @@ spec_path = args.get("spec"); out_dir = args.get("out", os.getcwd())
 with open(spec_path, "r") as f:
     spec = json.load(f)
 
-name = spec.get("name","Book")
+name = spec.get("name", "Book")
 sx, sy, sz = (spec["size_m"]["x"], spec["size_m"]["y"], spec["size_m"]["z"])
-bevel = spec.get("bevel_m", 0.002)
-corner_caps = spec.get("corner_caps", True)
+bevel = float(spec.get("bevel_m", 0.002))
+corner_caps = bool(spec.get("corner_caps", True))
 strap = spec.get("strap", {"enabled": False})
 
-# -------- clean scene
+# --- clean scene
 bpy.ops.wm.read_factory_settings(use_empty=True)
 
-# -------- build low poly book as a cube
+# --- build low poly: start from cube (2m cube at size=1.0)
 mesh = bpy.data.meshes.new("book_lp")
 obj = bpy.data.objects.new(name, mesh)
 bpy.context.scene.collection.objects.link(obj)
 bm = bmesh.new()
-bmesh.ops.create_cube(bm, size=1.0)  # 2m cube
+bmesh.ops.create_cube(bm, size=1.0)
 bm.to_mesh(mesh); bm.free()
 
-# scale to meters (cube size=2 → scale by half of desired dims)
+# scale to meters (cube at size=1 spans 2m, so use half the desired dims)
 obj.scale = (sx/2, sy/2, sz/2)
 bpy.context.view_layer.objects.active = obj
 bpy.ops.object.transform_apply(location=False, rotation=False, scale=True)
 
-# bevel modifier for soft edges
+# bevel soft edges
 bev = obj.modifiers.new("Bevel","BEVEL")
 bev.width = bevel
 bev.segments = 2
 bev.limit_method = 'ANGLE'
 bev.angle_limit = math.radians(60)
 
-# simple spine loopcut (visual separation only; minimalistic)
+# simple spine loopcut (visual separation — minimal)
 bpy.ops.object.mode_set(mode='EDIT')
 bpy.ops.mesh.loopcut_slide(MESH_OT_loopcut={"number_cuts":1}, TRANSFORM_OT_edge_slide={"value":0.0})
 bpy.ops.object.mode_set(mode='OBJECT')
 
 # optional strap
 if strap.get("enabled", False):
-    w = strap.get("width_m", 0.025)
+    w = float(strap.get("width_m", 0.025))
     bpy.ops.mesh.primitive_cube_add(size=1)
     s = bpy.context.active_object; s.name = "strap"
     s.scale = (sx*0.55, w/2, sz/2*1.05)
@@ -80,19 +80,19 @@ bpy.ops.object.modifier_apply(modifier=bev.name)
 obj.data.use_auto_smooth = True
 bpy.ops.object.shade_smooth()
 
-# basic UV unwrap (smart project to keep it simple for now)
+# UV unwrap (keep simple for now)
 bpy.ops.object.mode_set(mode='EDIT')
 bpy.ops.uv.smart_project(angle_limit=66, island_margin=0.02)
 bpy.ops.object.mode_set(mode='OBJECT')
 
-# simple PBR material (leather)
+# simple PBR material
 mat = bpy.data.materials.new("MAT_Book")
 mat.use_nodes = True
 nt = mat.node_tree
 bsdf = nt.nodes.get("Principled BSDF")
 base = nt.nodes.new("ShaderNodeRGB")
-leather = spec.get("style", {}).get("leather", "dark_brown")
-base.outputs[0].default_value = (0.12,0.06,0.03,1.0) if "brown" in leather else (0.2,0.2,0.2,1.0)
+leather = str(spec.get("style", {}).get("leather", "dark_brown"))
+base.outputs[0].default_value = (0.12, 0.06, 0.03, 1.0) if "brown" in leather else (0.2, 0.2, 0.2, 1.0)
 nt.links.new(base.outputs["Color"], bsdf.inputs["Base Color"])
 bsdf.inputs["Roughness"].default_value = 0.6
 bsdf.inputs["Metallic"].default_value = 0.0