BlenderUnrealCollisionScript.txt

#1 December 2018
#Added functionality to toggle auto-unwrap on or off

#26 December 2017
#Dingo_aus 
#Script adds geometry that Unreal Engine interprets to be the collision volumes. Collision data will be added to layer 2 in Blender
#script requires objects to be selected for collision to be added

#0) remove the full stop from previsouly duplicated names
#0.5) Smart Project Unwrap each item (calculate UVs)
#1) Duplicates all selected objects then
#2) runs through a loop and finds the duplicated items with ".001, .002, .003 etc" and renames these 
#   objects to be collision objects. Will also put the collision volumes on Layer 2.

#GLOBAL VARIABLES
#set the variable below to 1 if you want the script to automatically unwrap the UVs of each selected visible mesh.
SHOULD_AUTO_UNWRAP = 0

import bpy
print("Start---------------- ")
#0)

for obj in bpy.context.selected_objects:
    obj.name = obj.name.replace(".","_")
print("---Any fullstops in names successfully replaced with underscores... continuing")

#0.5) - Smart unwrap each object's UVs if GLOBAL variation set to unwrap

if SHOULD_AUTO_UNWRAP == 1:
    bpy.ops.object.mode_set(mode = 'OBJECT')
    unwrapcount = 0
    for obj in bpy.data.objects:
        #bpy.ops.object.select_all(action= 'DESELECT')
        #if obj.layers[0] == True:
        #    bpy.context.scene.objects.active = obj
        #    obj.select = True
        #else:
        #    continue
    #Just to be sure that is everything deselected
        bpy.ops.object.mode_set(mode = 'EDIT')
        bpy.ops.mesh.select_all(action = 'DESELECT')
        bpy.ops.object.mode_set(mode = 'OBJECT')
        print("---unwrapping: " + obj.name)
        bpy.ops.uv.smart_project()
        unwrapcount = unwrapcount + 1
    print("---Total objects unwrapped:" + str(unwrapcount))
    print("---All objects have been unwrapped")
elif SHOULD_AUTO_UNWRAP == 0:
    print("---No Objects Unwrapped, original set UV Coords used---")

#1)
#Duplicate selected objects...then rename to be the collision
bpy.ops.object.duplicate()

print("---All objects duplicated")

#3)
#rename objects
n = 1
for obj in bpy.context.selected_objects:
    n = n +1
    oldname = obj.name
    temp_str = oldname[-4:]
    temp_str2 = "."
    #print(temp_str)
    if temp_str[:1] == temp_str2:
        print("CANDIDATE TO CONVERT TO PHYSICS VOLUME HAS BEEN FOUND: " + oldname)
        #add prefix
        obj.name = "UCX_" + obj.name 
        #remove last four characters
        obj.name = obj.name[:-4]
        #add postfix
        postfix_str = str(n)
        obj.name = obj.name + "_" + postfix_str.rjust(2, '0')
        #add to separate layer so export can exclude UCX objects and painted in Substance Painter etc
        #move to layer 2
        obj.layers=(False, True, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False)
        print("Collision volumes assigned to layer 2")
    print(obj.name)
print("Success!")