Constraint Setup

constraint_setup.py

import bpy
from mathutils import Vector


cam_data = bpy.data.cameras.new("Camera")
cam_data.type = 'ORTHO'
cam_data.ortho_scale = 4.0

cam_obj = bpy.data.objects.new(cam_data.name, cam_data)
cam_obj.location = (10.0, 10.0, 5.0)
bpy.context.collection.objects.link(cam_obj)

empty_obj = bpy.data.objects.new("Cam.Target", None)
empty_obj.location = (0.0, 0.0, 0.0)
bpy.context.collection.objects.link(empty_obj)

look_at_constraint = cam_obj.constraints.new("TRACK_TO")
look_at_constraint.target = empty_obj

area_0 = bpy.data.lights.new("Area.000", 'AREA')
area_1 = bpy.data.lights.new("Area.001", 'AREA')
area_2 = bpy.data.lights.new("Area.002", 'AREA')
lights = [area_0, area_1, area_2]

locs = [
    Vector((2.0, -2.0, 1.0)),
    Vector((2.0, 2.0, 1.0)),
    cam_obj.location + Vector((0.25, -0.25, 1.5))
]

sizes = [1.0, 1.0, 2.0]
energies = [20.0, 20.0, 40.0]

# For lights, colors should have 3 entries, not 4,
# as they do not contain alpha.
clrs = [
    (0.75, 0.0, 0.5),
    (0.1, 0.5, 1.0),
    (1.0, 0.875, 0.825)
]

i_range = range(0, len(lights), 1)
for i in i_range:
    light_data = lights[i]
    light_data.energy = energies[i]
    light_data.color = clrs[i]
    light_data.size = sizes[i]

    light_obj = bpy.data.objects.new(light_data.name, light_data)
    light_obj.location = locs[i]
    bpy.context.collection.objects.link(light_obj)

    look_at_constraint = light_obj.constraints.new("TRACK_TO")
    look_at_constraint.target = empty_obj