blender render engine: render buildings… in theory
This commit is contained in:
Laura Klünder
parent
1d40e3f02a
commit
5b4ee0b4d0
6 changed files with 142 additions and 9 deletions
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@ -43,12 +43,13 @@ class RenderEngine(ABC):
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self.maxx = self.minx + width / scale
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self.maxy = self.miny + height / scale
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self.bbox = box(self.minx, self.miny, self.maxx, self.maxy)
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# how many pixels around the image should be added and later cropped (otherwise rsvg does not blur correctly)
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self.buffer = int(math.ceil(buffer*self.scale))
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self.buffered_width = self.width + 2 * self.buffer
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self.buffered_height = self.height + 2 * self.buffer
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self.buffered_bbox = box(self.minx, self.miny, self.maxx, self.maxy).buffer(buffer, join_style=JOIN_STYLE.mitre)
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self.buffered_bbox = self.bbox.buffer(buffer, join_style=JOIN_STYLE.mitre)
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self.background_rgb = tuple(int(background[i:i + 2], 16)/255 for i in range(1, 6, 2))
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@ -1,5 +1,8 @@
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import re
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from itertools import chain
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import numpy as np
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from shapely import prepared
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from shapely.affinity import scale
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from shapely.geometry import LineString, Point
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from shapely.ops import unary_union
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@ -8,6 +11,7 @@ from c3nav.mapdata.render.engines import register_engine
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from c3nav.mapdata.render.engines.base3d import Base3DEngine
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from c3nav.mapdata.render.utils import get_full_levels, get_min_altitude
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from c3nav.mapdata.utils.geometry import assert_multipolygon
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from c3nav.mapdata.utils.mesh import triangulate_gapless_mesh_from_polygons
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@register_engine
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@ -35,6 +39,13 @@ class BlenderEngine(Base3DEngine):
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bmesh.ops.triangulate(bm, faces=bm.faces[:], quad_method=0, ngon_method=0)
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bmesh.update_edit_mesh(me, True)
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def clone_object(obj):
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new_obj = obj.copy()
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new_obj.data = obj.data.copy()
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scene = bpy.context.scene
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scene.objects.link(new_obj)
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return new_obj
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def extrude_object(obj, height):
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select_object(obj)
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bpy.ops.object.mode_set(mode='EDIT')
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@ -46,7 +57,7 @@ class BlenderEngine(Base3DEngine):
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)
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triangulate_object(obj)
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bpy.ops.mesh.select_all(action='SELECT')
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bpy.ops.mesh.normals_make_consistent()
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bpy.ops.mesh.normals_make_consistent(inside=False)
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bpy.ops.object.mode_set(mode='OBJECT')
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def subtract_object(obj, other_obj, delete_after=False):
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@ -152,7 +163,37 @@ class BlenderEngine(Base3DEngine):
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extrude_object(obj, extrude)
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return obj
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def add_mesh(name, vertices, faces):
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edges = set()
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for face in faces:
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for edge in ((face[0], face[1]), (face[1], face[2]), (face[2], face[0])):
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edges.add(tuple(sorted(edge)))
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# create mesh
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mesh = bpy.data.meshes.new(name=name)
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mesh.from_pydata(
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vertices,
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tuple(edges),
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faces,
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)
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# add mesh to scene
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obj = bpy.data.objects.new(name, mesh)
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scene = bpy.context.scene
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scene.objects.link(obj)
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return obj
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def cut_using_mesh_planes(obj, bottom_mesh_plane, top_mesh_plane, height):
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height = abs(height)
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bottom_obj = clone_object(bottom_mesh_plane)
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extrude_object(bottom_obj, -height)
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subtract_object(obj, bottom_obj, delete_after=False)
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top_obj = clone_object(top_mesh_plane)
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extrude_object(top_obj, height)
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subtract_object(obj, top_obj, delete_after=False)
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polygons_for_join = []
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current_mesh_plane = None
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''')
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def _clean_python(self, code):
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@ -168,10 +209,16 @@ class BlenderEngine(Base3DEngine):
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def _add_python(self, code):
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self.result += self._clean_python(code)+'\n'
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def custom_render(self, level_render_data, bbox, access_permissions):
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def custom_render(self, level_render_data, access_permissions):
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levels = get_full_levels(level_render_data)
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min_altitude = get_min_altitude(levels, default=level_render_data.base_altitude)
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vertices, faces = triangulate_gapless_mesh_from_polygons([self.buffered_bbox])
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current_min_z = min_altitude-700
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current_max_z = min_altitude-700
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vertices = np.hstack((vertices, np.full((vertices.shape[0], 1), current_min_z)))
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self._add_mesh_plane('Bottom mesh', vertices / 1000, faces)
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for geoms in levels:
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# hide indoor and outdoor rooms if their access restriction was not unlocked
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restricted_spaces_indoors = unary_union(
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@ -184,22 +231,79 @@ class BlenderEngine(Base3DEngine):
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)
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restricted_spaces = unary_union((restricted_spaces_indoors, restricted_spaces_outdoors)) # noqa
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# crop altitudeareas
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for altitudearea in geoms.altitudeareas:
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altitudearea.geometry = altitudearea.geometry.geom.difference(restricted_spaces)
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altitudearea.geometry_prep = prepared.prep(altitudearea.geometry)
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# crop heightareas
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new_heightareas = []
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for geometry, height in geoms.heightareas:
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geometry = geometry.geom.difference(restricted_spaces)
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geometry_prep = prepared.prep(geometry)
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new_heightareas.append((geometry, geometry_prep, height))
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geoms.heightareas = new_heightareas
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# create upper bounds for this level's walls (next mesh plane)
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vertices, faces = triangulate_gapless_mesh_from_polygons(
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[self.buffered_bbox] + assert_multipolygon(geoms.buildings) +
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list(chain(*(assert_multipolygon(altitudearea.geometry) for altitudearea in geoms.altitudeareas)))
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)
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altitudes = []
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for x, y in vertices:
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point = Point(x/1000, y/1000)
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xy = np.array((x, y))
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matching_altitudeareas = [altitudearea for altitudearea in geoms.altitudeareas
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if altitudearea.geometry_prep.intersects(point)]
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if not matching_altitudeareas:
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altitudearea_distances = tuple((altitudearea.geometry.distance(point), altitudearea)
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for altitudearea in geoms.altitudeareas)
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min_distance = min(distance for distance, altitudearea in altitudearea_distances)
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matching_altitudeareas = [altitudearea for distance, altitudearea in altitudearea_distances
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if distance == min_distance]
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altitude = max(altitudearea.get_altitudes(xy)[0] for altitudearea in matching_altitudeareas)
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matching_heights = [height for geom, geom_prep, height in geoms.heightareas
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if geom_prep.intersects(point)]
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if not matching_heights:
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heightarea_distances = tuple((geom.distance(point), i)
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for i, (geom, geom_prep, height) in enumerate(geoms.heightareas))
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min_distance = min(distance for distance, i in heightarea_distances)
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matching_heights = [geoms.heightareas[i][2] for distance, i in heightarea_distances
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if distance == min_distance]
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height = max(matching_heights)
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altitudes.append(altitude+height)
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last_min_z = current_min_z
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last_max_z = current_max_z # noqa
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current_min_z = min(altitudes) # noqa
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current_max_z = max(altitudes)
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vertices = np.hstack((vertices, np.array(altitudes).reshape((vertices.shape[0], 1))))
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self._add_mesh_plane('Level %s top mesh plane' % geoms.short_label, vertices / 1000, faces)
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self._add_polygon('Level %s buildings' % geoms.short_label, geoms.buildings,
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last_min_z-1, current_max_z+1)
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self._cut_last_poly_with_mesh_planes(last_min_z-1, current_max_z+1)
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for altitudearea in geoms.altitudeareas:
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break
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name = 'Level %s Altitudearea %s' % (geoms.short_label, altitudearea.altitude)
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if altitudearea.altitude2 is not None:
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min_slope_altitude = min(altitudearea.altitude, altitudearea.altitude2)
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max_slope_altitude = max(altitudearea.altitude, altitudearea.altitude2)
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self._add_polygon(name, altitudearea.geometry.geom, min_slope_altitude, max_slope_altitude)
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bounds = altitudearea.geometry.geom.bounds
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self._add_polygon(name, altitudearea.geometry, min_slope_altitude, max_slope_altitude)
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bounds = altitudearea.geometry.bounds
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self._add_slope(bounds, altitudearea.altitude, altitudearea.altitude2,
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altitudearea.point1, altitudearea.point2)
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self._subtract_slope()
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self._collect_last_polygon_for_join()
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self._add_polygon(name, altitudearea.geometry.geom, min_altitude-700, min_slope_altitude)
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self._add_polygon(name, altitudearea.geometry, min_altitude-700, min_slope_altitude)
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self._collect_last_polygon_for_join()
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self._join_polygons()
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else:
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self._add_polygon(name, altitudearea.geometry.geom, min_altitude-700, altitudearea.altitude)
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self._add_polygon(name, altitudearea.geometry, min_altitude-700, altitudearea.altitude)
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break
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@ -216,6 +320,8 @@ class BlenderEngine(Base3DEngine):
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'maxz': maxz/1000,
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}
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)
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self._collect_last_polygon_for_join()
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self._join_polygons()
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def _add_slope(self, bounds, altitude1, altitude2, point1, point2):
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altitude_diff = altitude2-altitude1
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@ -247,6 +353,20 @@ class BlenderEngine(Base3DEngine):
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}
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)
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def _add_mesh_plane(self, name, vertices, faces):
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self._add_python('last_mesh_plane = current_mesh_plane')
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self._add_python(
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'current_mesh_plane = add_mesh(name=%(name)r, vertices=%(vertices)r, faces=%(faces)r)' % {
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'name': name,
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'vertices': vertices.tolist(),
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'faces': faces.tolist(),
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}
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)
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def _cut_last_poly_with_mesh_planes(self, minz, maxz):
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height = maxz-minz
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self._add_python('cut_using_mesh_planes(last_polygon, last_mesh_plane, current_mesh_plane, %f)' % (height/1000))
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def _subtract_slope(self):
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self._add_python('subtract_object(last_polygon, last_slope, delete_after=True)')
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