# Set the start and duration of the build modifer for each object.

# Get the object index. Use that to set the random seed.

# If index < 117
# Start frame = (117 - index) + 125

# If index > 118
# Start frame = (index - 118) + 125

# For symmetry just do abs(120-index). Then start frame zero for
# central regions and progressively increases.

# To create the appearance of long columns, need a non-linear
# increase in start frame. We want it to increase more slowly the
# further we are from the centre.


import bpy



for obj in bpy.data.objects:
    if ('Img3D_XY' in obj.name) and ('rev' not in obj.name):
        index = int(obj.name.split('_')[2])
        
        offset = abs(index - 120)
        foffset = float(offset)
        
        sframe = offset = foffset**2.0
        length = 120
        
        bpy.data.objects[obj.name].modifiers["Build"].frame_start = sframe
        bpy.data.objects[obj.name].modifiers["Build"].frame_duration = length

        
#        if index <= 241:
#            if index < 117:
#                sframe = 117 - index + 125
#                length = 500 - sframe
#                bpy.data.objects[obj.name].modifiers["Build"].frame_start = sframe
#                bpy.data.objects[obj.name].modifiers["Build"].frame_duration = length
#       
#            if index > 118:
#                sframe = index - 118 + 125
#                length = 500 - sframe
#                bpy.data.objects[obj.name].modifiers["Build"].frame_start = sframe
#                bpy.data.objects[obj.name].modifiers["Build"].frame_duration = length