def cvxHull(shape_list_or_scene, color=Green):
"""create a convex hull enveloppe
:param Scene scene: a scene with shapes to process
:param color color: a PGL Material to place on the convex hull
:return: a PGL shape
::
scene = Scene()
scene += shapes
hull = cvxhull(scene, color=Material(0,255,0))
scene += hull
Viewer.display(hull)
.. figure:: convex.png
:width: 50%
Example of convex hull enveloppe (of the leaves) added on top of a tree generated with pruning.lpy
"""
group = pgl.Group([sh.geometry for sh in shape_list_or_scene])
tglSet = pgl.fit('convexhull', group)
hull = pgl.Shape(tglSet, color)
return hull
def oneScHullScene(scgroup,pointsbyshape):#aka hullscene
"""cree les cvxHull des groupes de scgroup"""
sc = pgl.Scene()
m = color(20,150,20, trans=True)
for ids in scgroup:
pts = ptUnion(pointsbyshape,ids)
sc += pgl.Shape(pgl.fit('convexhull',pgl.Polyline(pts)),m)
return sc
def computeBoundingShape(scene, shape='bellipsoid'):
"""
Compute a bounding volume for the given `scene`.
The `shape` of this volume can be one of these keyword
Note that the `pgl.fit` could deliver different shapes by using
one of the following keyword instead of 'ellipsoid':
EXTRUDEDHULL ; ASYMMETRICHULL ; EXTRUSION ; SPHERE ; ASPHERE ; BSPHERE
CYLINDER ; ACYLINDER ; BCYLINDER ; ELLIPSOID ; BELLIPSOID2 ; AELLIPSOID
BELLIPSOID ; AALIGNEDBOX ; BALIGNEDBOX ; BOX ; ABOX ; BBOX ; CONVEXHULL
"""
gr = fruti.pgl.Group([sh.geometry for sh in scene])
tglset = pgl.fit(shape, gr)
#hull = pgl.Shape( tglSet, __Green )
return tglset
def ptsHull( ptsList, id = 0 ):
m = color( 20,150,20,trans=True )
shape = pgl.Shape(pgl.fit('convexhull',pgl.Polyline(ptsList)),m)
shape.id = id
return shape
def cvxHull( scene ): #work with scene or shape list group = pgl.Group( [ sh.geometry for sh in scene ] ) tglSet = pgl.fit( 'convexhull', group ) hull = pgl.Shape( tglSet, __Green ) return hull
