Write a script to generate silhouettes from models

This one doesn't require autotracing the lines, which should make
for better results.

scripts/blender-freestyle.py

@@ -0,0 +1,100 @@
+import bpy
+from mathutils import Vector, Euler
+from math import pi
+import json
+import os
+import subprocess
+import xml.etree.ElementTree as ET
+
+c = bpy.data.objects["cam"]
+
+selected = bpy.context.selected_objects[0]
+
+bpy.ops.object.transform_apply( rotation = True )
+
+data = {}
+
+b = selected
+
+FRONT = [0, 1, 2, "Front"]
+SIDE = [1, 1, 2, "Side"]
+TOP = [0, 0, 1, "Top"]
+ANGLED = [0.5, 1, 2, "Angled"]
+
+sides = [FRONT, SIDE, TOP, ANGLED]
+
+path = "/tmp/macrovision/"
+
+media_path = "/home/crux/furry/macrovision/media/"
+media_folder = "buildings/Houses/"
+
+os.makedirs(path, exist_ok=True)
+os.makedirs(os.path.join(media_path, media_folder), exist_ok=True)
+
+
+ns = {"svg": "http://www.w3.org/2000/svg"}
+ET.register_namespace("", ns["svg"])
+
+TEMPLATE =  """
+        {{
+            name: "{0}",
+            sides: {{
+{1}
+            }}
+        }}"""
+
+VIEW_TEMPLATE = '                "{0}": {{ height: math.unit({1}, "meters") }}'
+
+for angles in sides:
+    local_bbox_center = 0.125 * sum((Vector(box) for box in b.bound_box), Vector())
+    global_bbox_center = b.matrix_world @ local_bbox_center
+    c.location = global_bbox_center
+    c.data.ortho_scale = max(b.dimensions) * 1.1
+    c.rotation_euler = Euler([angles[1] * pi / 2, 0, angles[0] * pi / 2])
+    rot = c.rotation_euler.to_matrix()
+    rot.invert()
+    c.location = c.location + Vector([0, 0, 100]) @ rot
+    data[angles[3]] = b.dimensions[angles[2]]
+    output_path = os.path.join(path, f"{b.name}-{angles[3]}")
+    bpy.context.scene.render.filepath = output_path
+
+    svg_path = output_path + "0001.svg"
+
+    bpy.ops.render.render(write_still = True)
+    os.rename(svg_path, output_path + ".svg")
+
+    subprocess.check_output([
+        "potrace",
+        "-b",
+        "svg",
+        output_path + ".bmp",
+        "-o",
+        output_path + "-fill.svg"
+    ])
+
+    line_xml = ET.parse(output_path + ".svg")
+    fill_xml = ET.parse(output_path + "-fill.svg")
+    
+    lines = line_xml.find("./svg:g", namespaces=ns)
+
+    fill_xml.find("svg:g[@fill='#000000']", namespaces=ns).attrib["fill"] = "#1a1a1a"
+
+    fill_xml.iter().__next__().append(lines)
+
+    fill_xml.write(output_path + "-combined.svg")
+
+    subprocess.Popen([
+        "inkscape",
+        "--without-gui",
+        "--export-plain-svg=" + os.path.join(media_path, media_folder, f"{b.name}-{angles[3]}.svg"),
+        "--export-area-drawing",
+        output_path + "-combined.svg"
+    ])
+
+    fill_xml.write(os.path.join(media_path, media_folder, f"{b.name}-{angles[3]}.svg"))
+
+lines = []
+for key, value in data.items():
+    lines.append(VIEW_TEMPLATE.format(key, value))
+
+print(TEMPLATE.format(b.name, ",\n".join(lines)))