def build_normalPerVertex( vertices, creaseAngle, vertexArray=None ):
'''Create a normal vector using creaseAngle to determine smoothing
Note: the semantics of normalPerVertex requires using expanded
(i.e. tessellated) values, as the generated normals are *not*
supposed to be applied to each vertex, but instead to each
*use* of each vertex (i.e. each triangle's ref to the vertex
has a potentially different normal)
vertices -- list of vertex objects in rendering order (triangles)
creaseAngle -- radian angle above which faces do not smooth.
vertexArray -- x*3*3 array of coordinates expanded into a flat
data-array, if not provided, generated from vertices
'''
if vertexArray is None:
vertexArray = array([vertex.point for vertex in vertices],'f')
faceNormals = triangleutilities.normalPerFace( vertexArray )
vertexNormals = repeat(faceNormals,[3]*len(faceNormals),0)
faceNormals = array(vertexNormals[:])
items = {}
for index in range( len( vertices)):
try:
items.setdefault( vertices[index].coordIndex, []).append( index )
except TypeError, err:
print vertices[index]
print type(vertices[index].coordIndex),vertices[index].coordIndex
raise
def build_normalPerVertex(vertices, creaseAngle, vertexArray=None):
'''Create a normal vector using creaseAngle to determine smoothing
Note: the semantics of normalPerVertex requires using expanded
(i.e. tessellated) values, as the generated normals are *not*
supposed to be applied to each vertex, but instead to each
*use* of each vertex (i.e. each triangle's ref to the vertex
has a potentially different normal)
vertices -- list of vertex objects in rendering order (triangles)
creaseAngle -- radian angle above which faces do not smooth.
vertexArray -- x*3*3 array of coordinates expanded into a flat
data-array, if not provided, generated from vertices
'''
if vertexArray is None:
vertexArray = array([vertex.point for vertex in vertices], 'f')
faceNormals = triangleutilities.normalPerFace(vertexArray)
vertexNormals = repeat(faceNormals, [3] * len(faceNormals), 0)
faceNormals = array(vertexNormals[:])
items = {}
for index in range(len(vertices)):
try:
items.setdefault(vertices[index].coordIndex, []).append(index)
except TypeError, err:
print vertices[index]
print type(vertices[index].coordIndex), vertices[index].coordIndex
raise
def __init__(self, points, normals=None, ccw=1):
"""Initialize the EdgeSet
points -- n*3 array of points, n%3 == 0, where each
set of three points defines a single triangle in
ccw winding
normals -- optional array of per-triangle normals, will
be calculated if necessary
ccw -- boolean indicating whether counter-clock-wise
winding is to be used (normal OpenGL/VRML winding)
if false, then use clockwise winding
(Note that this has never been tested, as I don't
have any cw geometry around to test with, and haven't
felt energetic enough to work around the standard
tools to make any)
"""
self.volumes = weakref.WeakKeyDictionary()
self.ccw = ccw
self.points = points
self.normals = triangleutilities.normalPerFace(points, ccw=ccw)
self.points_to_edges()
def __init__( self, points, normals=None, ccw = 1 ):
"""Initialize the EdgeSet
points -- n*3 array of points, n%3 == 0, where each
set of three points defines a single triangle in
ccw winding
normals -- optional array of per-triangle normals, will
be calculated if necessary
ccw -- boolean indicating whether counter-clock-wise
winding is to be used (normal OpenGL/VRML winding)
if false, then use clockwise winding
(Note that this has never been tested, as I don't
have any cw geometry around to test with, and haven't
felt energetic enough to work around the standard
tools to make any)
"""
self.volumes = weakref.WeakKeyDictionary()
self.ccw = ccw
self.points = points
self.normals = triangleutilities.normalPerFace( points, ccw=ccw )
self.points_to_edges()
def build_normalPerVertex(vertices, creaseAngle, vertexArray=None):
'''Create a normal vector using creaseAngle to determine smoothing
Note: the semantics of normalPerVertex requires using expanded
(i.e. tessellated) values, as the generated normals are *not*
supposed to be applied to each vertex, but instead to each
*use* of each vertex (i.e. each triangle's ref to the vertex
has a potentially different normal)
vertices -- list of vertex objects in rendering order (triangles)
creaseAngle -- radian angle above which faces do not smooth.
vertexArray -- x*3*3 array of coordinates expanded into a flat
data-array, if not provided, generated from vertices
'''
if vertexArray is None:
vertexArray = array([vertex.point for vertex in vertices], 'f')
faceNormals = triangleutilities.normalPerFace(vertexArray)
vertexNormals = repeat(faceNormals, [3] * len(faceNormals), 0)
faceNormals = array(vertexNormals[:])
items = {}
for index in range(len(vertices)):
try:
items.setdefault(vertices[index].coordIndex, []).append(index)
except TypeError as err:
print vertices[index]
print type(vertices[index].coordIndex), vertices[index].coordIndex
raise
# verticies. We use ones instead of zeros because each face
# contributes to its own corner. Note: will be promoted to float
# during the final division
counts = ones((len(vertexNormals), ), 'f')
for vertexSet in items.values():
# For each primary user (triangle corner)
for index in range(len(vertexSet)):
primaryNormal = faceNormals[vertexSet[index]]
# check to see if any of the remaining triangles should
# be blended with this one
for innerindex in range(index + 1, len(vertexSet)):
secondaryNormal = faceNormals[vertexSet[innerindex]]
# if angle < creaseAngle... should calculate
# cos(creaseAngle) instead of using arccos each time
try:
angle = arccos(dot(primaryNormal, secondaryNormal))
except ValueError as err: # arccos of equal vectors goes kablooie
angle = 0
if angle < creaseAngle:
#add to each other's cummulative total (in place)
add(vertexNormals[vertexSet[index]], secondaryNormal,
vertexNormals[vertexSet[index]]) # add in place
add(vertexNormals[vertexSet[innerindex]], primaryNormal,
vertexNormals[vertexSet[innerindex]]) # add in place
# and increment the element counts
counts[vertexSet[index]] = counts[vertexSet[index]] + 1
counts[vertexSet[innerindex]] = counts[
vertexSet[innerindex]] + 1
# reshape counts to allow for in-place division...
counts.shape = (-1, 1)
# divide in place, completing the averaging (and thereby hopefully
# re-normalising the Normal vectors)
divide(vertexNormals, counts, vertexNormals)
return vertexNormals
def compile(
self,
visible=1,
lit=1,
textured=1,
transparent=0,
mode=None,
):
"""Compile to an opaque textured display-list"""
dl = displaylist.DisplayList()
dl.start()
try:
if (not self.target.normal) or (
self.target.normal and not len(self.target.normal.vector)):
# need to generate per-face or per-vertex-use vectors,
# require tessellation!
vertices = self.tessellate()
if not vertices:
return None
if self.target.normalPerVertex:
normalArray = build_normalPerVertex(
vertices, self.target.creaseAngle)
normalStep = 1
else:
normalArray = triangleutilities.normalPerFace(vertexArray)
normalArray = repeat(normalArray, [3] * len(normalArray),
0)
normalStep = 3
glBegin(GL_TRIANGLES)
if self.target.DEBUG_DRAW_NORMALS:
normalValues = []
try:
normalIndex = -1
for vIndex in xrange(len(vertices)):
vertex = vertices[vIndex]
if vIndex % normalStep == 0:
normalIndex += 1
glNormal3dv(normalArray[normalIndex])
if vertex.color is not None:
glColor3dv(vertex.color)
if vertex.textureCoordinate is not None:
glTexCoord2dv(vertex.textureCoordinate)
glVertex3dv(vertex.point)
if self.target.DEBUG_DRAW_NORMALS:
normalValues.append(
(vertex.point,
vertex.point + normalArray[normalIndex]))
finally:
glEnd()
if self.target.DEBUG_DRAW_NORMALS:
glBegin(GL_LINES)
try:
for (v, n) in normalValues:
glColor3f(1, 0, 0)
glVertex3dv(v)
glColor3f(0, 1, 0)
glVertex3dv(n)
finally:
glEnd()
else:
# already has normals, can render without tessellation
for polygon in self.polygons():
if len(polygon) == 3:
glBegin(GL_TRIANGLES)
elif len(polygon) == 4:
glBegin(GL_QUADS)
elif len(polygon) < 3:
continue
else:
glBegin(GL_POLYGON)
try:
for vertex in polygon:
if vertex.normal is not None:
glNormal3dv(vertex.normal)
if vertex.color is not None:
glColor3dv(vertex.color)
if vertex.textureCoordinate is not None:
glTexCoord2dv(vertex.textureCoordinate)
glVertex3dv(vertex.point)
finally:
glEnd()
return DisplayListRenderer(dl)
finally:
dl.end()
def compile(
self,
visible=1,
lit=1,
textured=1,
transparent=0,
mode=None,
):
"""Compile the rendering structures for an ArrayGeometry version of IFS
XXX Should redo to cache like so...
cache tessellated triangle indices
if any indices change, need to re-calculate everything
coord -> [ pointIndices ], [ calcualtedNormals ]
normal -> [ normalIndices ]
when points change, just re-calculate:
expanded-normals (if we are calculating normals)
expanded-points
when normals change (explicit normal/indices)
expanded-normals
fully-expanded normal, texCooord, and color
"""
### XXX should store normals regardless of "lit" field and discard lit
# XXX check to see if we are all using the same indices,
# if so, we can possibly use IndexedPolygons instead
# of IndexedFaceSet for rendering...
vertices = self.tessellate()
# vertices is now a list of vertices such that
# every three vertices represents a single triangle
# good time to build normals if required...
vertexArray = array([vertex.point for vertex in vertices], 'f')
if len(vertexArray) == 0:
return DUMMY_RENDER
else:
if (not self.target.normal) or (not len(
self.target.normal.vector)):
# need to calculate normals
if self.target.normalPerVertex:
normalArray = build_normalPerVertex(
vertices, self.target.creaseAngle, vertexArray)
else:
normalArray = triangleutilities.normalPerFace(vertexArray)
normalArray = repeat(normalArray, [3] * len(normalArray),
0)
else:
normalArray = []
for vertex in vertices:
if vertex.normal is not None:
normalArray.append(vertex.normal)
elif normalArray:
normalArray.append(normalArray[-1])
else:
normalArray.append((0, 0, 1))
normalArray = array(normalArray, 'f')
if self.target.color and len(self.target.color.color):
try:
colorArray = array([vertex.color for vertex in vertices],
'f')
except TypeError:
colorArray = None
log.warn(
"""%s tessellation appears to have created invalid color for tesselated vertex""",
self.target)
else:
colorArray = None
if self.target.texCoord and len(self.target.texCoord.point):
textureCoordinateArray = array(
[vertex.textureCoordinate for vertex in vertices], 'f')
else:
textureCoordinateArray = None
log.debug(
'Arrays: \nvertex -- %s\nnormal -- %s',
vertexArray,
normalArray,
)
ag = arraygeometry.ArrayGeometry(
vertexArray,
colorArray,
normalArray,
textureCoordinateArray,
objectType=GL_TRIANGLES,
ccw=self.target.ccw,
solid=self.target.solid,
)
return ag
def compile(
self,
visible = 1,
lit = 1,
textured = 1,
transparent = 0,
mode=None,
):
"""Compile to an opaque textured display-list"""
dl = displaylist.DisplayList()
dl.start()
try:
if (not self.target.normal) or (self.target.normal and not len(self.target.normal.vector)):
# need to generate per-face or per-vertex-use vectors,
# require tessellation!
vertices = self.tessellate()
if not vertices:
return None
if self.target.normalPerVertex:
normalArray = build_normalPerVertex(
vertices, self.target.creaseAngle
)
normalStep = 1
else:
normalArray = triangleutilities.normalPerFace( vertexArray)
normalArray = repeat( normalArray,[3]*len(normalArray),0)
normalStep = 3
glBegin( GL_TRIANGLES )
if self.target.DEBUG_DRAW_NORMALS:
normalValues = []
try:
normalIndex = -1
for vIndex in xrange(len(vertices)):
vertex = vertices[vIndex]
if vIndex % normalStep == 0:
normalIndex += 1
glNormal3dv( normalArray[normalIndex] )
if vertex.color is not None:
glColor3dv( vertex.color )
if vertex.textureCoordinate is not None:
glTexCoord2dv( vertex.textureCoordinate )
glVertex3dv( vertex.point )
if self.target.DEBUG_DRAW_NORMALS:
normalValues.append( (vertex.point, vertex.point+normalArray[normalIndex]) )
finally:
glEnd()
if self.target.DEBUG_DRAW_NORMALS:
glBegin( GL_LINES )
try:
for (v,n) in normalValues:
glColor3f( 1,0,0)
glVertex3dv( v )
glColor3f( 0,1,0)
glVertex3dv( n )
finally:
glEnd()
else:
# already has normals, can render without tessellation
for polygon in self.polygons():
if len(polygon) == 3:
glBegin( GL_TRIANGLES )
elif len(polygon) == 4:
glBegin( GL_QUADS )
elif len(polygon) < 3:
continue
else:
glBegin( GL_POLYGON )
try:
for vertex in polygon:
if vertex.normal is not None:
glNormal3dv( vertex.normal )
if vertex.color is not None:
glColor3dv( vertex.color )
if vertex.textureCoordinate is not None:
glTexCoord2dv( vertex.textureCoordinate )
glVertex3dv( vertex.point )
finally:
glEnd()
return DisplayListRenderer( dl )
finally:
dl.end()
def compile(
self,
visible = 1,
lit = 1,
textured = 1,
transparent = 0,
mode=None,
):
"""Compile the rendering structures for an ArrayGeometry version of IFS
XXX Should redo to cache like so...
cache tessellated triangle indices
if any indices change, need to re-calculate everything
coord -> [ pointIndices ], [ calcualtedNormals ]
normal -> [ normalIndices ]
when points change, just re-calculate:
expanded-normals (if we are calculating normals)
expanded-points
when normals change (explicit normal/indices)
expanded-normals
fully-expanded normal, texCooord, and color
"""
### XXX should store normals regardless of "lit" field and discard lit
# XXX check to see if we are all using the same indices,
# if so, we can possibly use IndexedPolygons instead
# of IndexedFaceSet for rendering...
vertices = self.tessellate()
# vertices is now a list of vertices such that
# every three vertices represents a single triangle
# good time to build normals if required...
vertexArray = array([vertex.point for vertex in vertices],'f')
if len(vertexArray) == 0:
return DUMMY_RENDER
else:
if (not self.target.normal) or (not len(self.target.normal.vector)):
# need to calculate normals
if self.target.normalPerVertex:
normalArray = build_normalPerVertex(
vertices, self.target.creaseAngle, vertexArray
)
else:
normalArray = triangleutilities.normalPerFace( vertexArray)
normalArray = repeat( normalArray,[3]*len(normalArray), 0)
else:
normalArray = []
for vertex in vertices:
if vertex.normal is not None:
normalArray.append( vertex.normal )
elif normalArray:
normalArray.append( normalArray[-1] )
else:
normalArray.append( (0,0,1))
normalArray = array(normalArray,'f')
if self.target.color and len(self.target.color.color):
try:
colorArray = array([vertex.color for vertex in vertices],'f')
except TypeError:
colorArray = None
log.warn("""%s tessellation appears to have created invalid color for tesselated vertex""",self.target)
else:
colorArray = None
if self.target.texCoord and len(self.target.texCoord.point):
textureCoordinateArray = array([vertex.textureCoordinate for vertex in vertices],'f')
else:
textureCoordinateArray = None
log.debug(
'Arrays: \nvertex -- %s\nnormal -- %s',
vertexArray, normalArray,
)
ag = arraygeometry.ArrayGeometry(
vertexArray,
colorArray,
normalArray,
textureCoordinateArray,
objectType= GL_TRIANGLES,
ccw = self.target.ccw,
solid = self.target.solid,
)
return ag
