Last active
August 5, 2018 23:23
-
-
Save tamask/3bf05cfff9da02f908f0a79701b6da7e to your computer and use it in GitHub Desktop.
Blender exporter for beziers
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
import os | |
import bpy | |
import math | |
import mathutils | |
bl_info = { | |
'name': 'Export Beziers (.svg)', | |
'author': 'Tamas Kemenczy', | |
'version': (0, 1), | |
'blender': (2, 6, 9), | |
'location': 'File > Import-Export > Beziers (.svg)', | |
'description': 'Flatten and export bezier curves to SVG', | |
'category': 'Import-Export', | |
} | |
def f(v): | |
return ('%.6f' % v).rstrip('0').rstrip('.') | |
def export_beziers(fp, objects): | |
min_x = max_x = min_y = max_y = 0 | |
for obj in objects: | |
corners = [ | |
obj.matrix_world * mathutils.Vector(v[:]) | |
for v in obj.bound_box] | |
for c in corners: | |
min_x = min(min_x, c.x) | |
max_x = max(max_x, c.x) | |
min_y = min(min_y, c.y) | |
max_y = max(max_y, c.y) | |
extent = max((abs(min_x), abs(max_x), abs(min_y), abs(max_y))) + 0.1 | |
extent = math.ceil(extent / 0.1) * 0.1 | |
root_objects = set() | |
all_objects = [] | |
curves = [obj for obj in objects if obj.type == 'CURVE'] | |
for obj in curves: | |
all_objects.append(obj) | |
while obj.parent: | |
obj = obj.parent | |
all_objects.append(obj) | |
root_objects.add(obj) | |
data = ( | |
('<svg viewBox="%s %s %s %s">' | |
'<g transform="scale(100,100)" ' | |
'vector-effect="non-scaling-stroke" ' | |
'fill="none" stroke="black" stroke-width="%s">') % | |
(f(-extent * 100), | |
f(-extent * 100), | |
f(extent * 200), | |
f(extent * 200), f(0.01)) | |
) | |
for r in root_objects: | |
data += svg_object(r, all_objects) | |
data += '</g></svg>' | |
fp.write(data) | |
def svg_object(obj, all_objects): | |
out = '<g id="%s" transform="%s">' % (obj.name, svg_transform(obj)) | |
if obj.type == 'CURVE': | |
out += svg_path(obj) | |
for child in obj.children: | |
if child in all_objects: | |
out += svg_object(child, all_objects) | |
out += '</g>' | |
return out | |
def svg_path(obj): | |
return '<path id="%s.%s" d="%s" />' % (obj.name, obj.data.name, svg_path_d(obj)) | |
def svg_transform(obj): | |
return ( | |
'translate(%s,%s) rotate(%s) scale(%s,%s)' % ( | |
f(obj.location.x), f(-obj.location.y), | |
f(math.degrees(-obj.rotation_euler.z)), | |
f(obj.scale.x), f(obj.scale.y), | |
)) | |
def svg_path_d(obj): | |
paths = [] | |
for spline in obj.data.splines: | |
if spline.type == 'BEZIER': | |
path = spline_to_commands(obj, spline) | |
paths.append(path) | |
return ' '.join(paths) | |
def spline_to_commands(obj, spline): | |
points = [] | |
q = mathutils.Euler((obj.rotation_euler.x, obj.rotation_euler.y, 0)).to_quaternion() | |
for p in spline.bezier_points: | |
points.extend((q * p.handle_left, q * p.co, q * p.handle_right)) | |
if spline.use_cyclic_u: | |
p = points.pop(0) | |
points.append(p) | |
points.append(points[0]) | |
else: | |
points.pop(0) | |
points.pop(len(points) - 1) | |
p = points[0] | |
commands = ['M %s,%s' % (f(p.x), f(-p.y)), 'C'] | |
i = 1 | |
while i < len(points): | |
p = points[i] | |
x1 = p.x | |
y1 = -p.y | |
i += 1 | |
p = points[i] | |
x2 = p.x | |
y2 = -p.y | |
i += 1 | |
p = points[i] | |
x = p.x | |
y = -p.y | |
i += 1 | |
commands.append(( | |
'%s,%s %s,%s %s,%s' % | |
(f(x1), f(y1), f(x2), f(y2), f(x), f(y)) | |
)) | |
if spline.use_cyclic_u: | |
commands.append('Z') | |
return ' '.join(commands) | |
class BezierExporter(bpy.types.Operator): | |
bl_idname = 'export_scene.beziers' | |
bl_label = 'Export Beziers' | |
filepath = bpy.props.StringProperty(subtype='FILE_PATH',) | |
@classmethod | |
def poll(cls, context): | |
return True | |
def execute(self, context): | |
objects = context.scene.objects | |
with open(self.filepath, 'w') as fp: | |
export_beziers(fp, context.scene.objects) | |
fp.flush() | |
return {'FINISHED'} | |
def invoke(self, context, event): | |
if not self.filepath: | |
self.filepath = bpy.path.ensure_ext(bpy.data.filepath, ".svg") | |
path = os.path.dirname(self.filepath) | |
blendname = os.path.splitext(os.path.basename(bpy.data.filepath))[0] | |
filename = '%s.svg' % blendname | |
self.filepath = os.path.join(path, filename) | |
wm = context.window_manager | |
wm.fileselect_add(self) | |
return {'RUNNING_MODAL'} | |
def menu_export(self, context): | |
self.layout.operator(BezierExporter.bl_idname, text="Beziers (.svg)") | |
bpy.utils.register_class(BezierExporter) | |
bpy.types.INFO_MT_file_export.append(menu_export) |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment