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improve slope stuff

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This commit is contained in:
Laura Klünder 2018-12-04 05:57:25 +01:00
parent d72c232bf9
commit ffc37cc636
1 changed files with 112 additions and 5 deletions
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117
src/c3nav/mapdata/render/engines/blender.py
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@ -1,5 +1,7 @@
import re
from shapely.affinity import scale
from shapely.geometry import LineString, Point
from shapely.ops import unary_union
from c3nav.mapdata.render.engines import register_engine
@ -46,7 +48,7 @@ class BlenderEngine(Base3DEngine):
bpy.ops.mesh.select_all(action='SELECT')
bpy.ops.object.mode_set(mode='OBJECT')
def subtract_object(obj, other_obj):
def subtract_object(obj, other_obj, delete_after=False):
select_object(obj)
bpy.ops.object.modifier_add(type='BOOLEAN')
mod = obj.modifiers
@ -54,6 +56,25 @@ class BlenderEngine(Base3DEngine):
mod[0].operation = 'DIFFERENCE'
mod[0].object = other_obj
bpy.ops.object.modifier_apply(apply_as='DATA', modifier=mod[0].name)
bpy.ops.object.mode_set(mode='EDIT')
bpy.ops.mesh.normals_make_consistent()
triangulate_object(obj)
bpy.ops.object.mode_set(mode='OBJECT')
if delete_after:
delete_object(other_obj)
def join_objects(objs):
obj = objs[0]
other_objs = objs[1:]
for other_obj in other_objs:
select_object(obj)
bpy.ops.object.modifier_add(type='BOOLEAN')
mod = obj.modifiers
mod[0].name = 'UNion'
mod[0].operation = 'UNION'
mod[0].object = other_obj
bpy.ops.object.modifier_apply(apply_as='DATA', modifier=mod[0].name)
delete_object(other_obj)
def delete_object(obj):
select_object(obj)
@ -66,8 +87,8 @@ class BlenderEngine(Base3DEngine):
exterior = add_ring(name, exterior, minz, maxz)
for i, interior_coords in enumerate(interiors):
interior = add_ring('%s interior %d' % (name, i), interior_coords, minz-1, maxz+1)
subtract_object(exterior, interior)
delete_object(interior)
subtract_object(exterior, interior, delete_after=True)
return exterior
def add_ring(name, coords, minz, maxz):
if coords[0] == coords[-1]:
@ -93,6 +114,36 @@ class BlenderEngine(Base3DEngine):
extrude_object(obj, maxz-minz)
return obj
def add_polygon_3d(name, coords, extrude):
if coords[0] == coords[-1]:
coords = coords[:-1]
if len(coords) < 3:
raise ValueError('Ring with less than 3 points.')
if bpy.context.object:
bpy.ops.object.mode_set(mode='OBJECT')
deselect_all()
# create ring
indices = tuple(range(len(coords)))
mesh = bpy.data.meshes.new(name=name)
mesh.from_pydata(
coords,
tuple(zip(indices, indices[1:]+(0, ))),
(indices, ),
)
# add ring to scene
obj = bpy.data.objects.new(name, mesh)
scene = bpy.context.scene
scene.objects.link(obj)
## extrude it
extrude_object(obj, extrude)
return obj
polygons_for_join = []
''')
def _clean_python(self, code):
@ -126,14 +177,26 @@ class BlenderEngine(Base3DEngine):
for altitudearea in geoms.altitudeareas:
name = 'Level %s Altitudearea %s' % (geoms.short_label, altitudearea.altitude)
self._add_polygon(name, altitudearea.geometry.geom, min_altitude-1, altitudearea.altitude)
if altitudearea.altitude2 is not None:
min_slope_altitude = min(altitudearea.altitude, altitudearea.altitude2)
max_slope_altitude = max(altitudearea.altitude, altitudearea.altitude2)
self._add_polygon(name, altitudearea.geometry.geom, min_slope_altitude-200, max_slope_altitude)
bounds = altitudearea.geometry.geom.bounds
self._add_slope(bounds, altitudearea.altitude, altitudearea.altitude2,
altitudearea.point1, altitudearea.point2)
self._subtract_slope()
# replace this by limiting the slope instead
self._add_polygon(name, altitudearea.geometry.geom, min_altitude-700, min_slope_altitude)
else:
self._add_polygon(name, altitudearea.geometry.geom, min_altitude-700, altitudearea.altitude)
break
def _add_polygon(self, name, geometry, minz, maxz):
geometry = geometry.buffer(0)
for polygon in assert_multipolygon(geometry):
self._add_python(
'add_polygon(name=%(name)r, exterior=%(exterior)r, interiors=%(interiors)r, '
'last_polygon = add_polygon(name=%(name)r, exterior=%(exterior)r, interiors=%(interiors)r, '
'minz=%(minz)f, maxz=%(maxz)f)' % {
'name': name,
'exterior': tuple(polygon.exterior.coords),
@ -143,5 +206,49 @@ class BlenderEngine(Base3DEngine):
}
)
def _add_slope(self, bounds, altitude1, altitude2, point1, point2):
altitude_diff = altitude2-altitude1
altitude_middle = (altitude1+altitude2)/2
altitude_halfdiff = altitude_diff/2
altitude_base = altitude1
line = LineString([point1, point2])
minx, miny, maxx, maxy = bounds
points_2d = [(minx-100, miny-100), (maxx+100, miny-100), (maxx+100, maxy+100), (minx-100, maxy+100)]
points_3d = []
for i, (x, y) in enumerate(points_2d):
point = Point((x, y))
pos = line.project(point)
while pos <= 0 or pos >= line.length-1:
line = scale(line, xfact=2, yfact=2, zfact=2)
altitude_diff *= 2
altitude_halfdiff *= 2
altitude_base = altitude_middle-altitude_halfdiff
pos = line.project(point)
z = ((pos/line.length)*altitude_diff)+altitude_base
points_3d.append((x, y, z/1000))
self._add_python(
'last_slope = add_polygon_3d(name=%(name)r, coords=%(coords)r, extrude=%(extrude)f)' % {
'name': 'tmpslope',
'coords': tuple(points_3d),
'extrude': abs(altitude1-altitude2)/1000+1,
}
)
def _subtract_slope(self):
self._add_python('subtract_object(last_polygon, last_slope, delete_after=True)')
def _collect_last_polygon_for_join(self):
self._add_python('polygons_for_join.append(last_polygon)')
def _clear_polygons_for_join(self):
self._add_python('polygons_for_join = []')
def _join_polygons(self):
self._add_python('join_objects(polygons_for_join)')
self._add_python('last_polygon = polygons_for_join[0]')
self._clear_polygons_for_join()
def render(self, filename=None):
return self.result.encode()