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"""This is a basic scenegraph module for Blender
It contains low level API calls..."""
# (c) 2001, Martin Strubel // onk@section5.de
from utils import quat #quaternions
from Blender import Object, Lamp, Scene
TOLERANCE = 0.01
def uniform_scale(vec):
v0 = vec[0]
d = abs(vec[1] - v0)
if d > TOLERANCE:
return 0
d = abs(vec[2] - v0)
if d > TOLERANCE:
return 0
return v0
class Transform:
"""An abstract transform, containing translation, rotation and scale information"""
def __init__(self):
self.scale = (1.0, 1.0, 1.0)
self.translation = (0.0, 0.0, 0.0)
self.rotation = quat.Quat()
self.scaleOrientation = quat.Quat() # axis, angle
self.parent = None
def __mul__(self, other):
s = uniform_scale(self.scale)
if not s:
raise RuntimeError, "non uniform scale, can't multiply"
t = Transform()
sc = other.scale
t.scale = (s * sc[0], s * sc[1], s * sc[2])
t.rotation = self.rotation * other.rotation
tr = s * apply(quat.Vector, other.translation)
t.translation = self.rotation.asMatrix() * tr + self.translation
return t
def getLoc(self):
t = self.translation
return (t[0], t[1], t[2]) # make sure it's a tuple..silly blender
def calcRotfromAxis(self, axisrotation):
self.rotation = apply(quat.fromRotAxis,axisrotation)
def getRot(self):
return self.rotation.asEuler()
def getSize(self):
s = self.scale
return (s[0], s[1], s[2])
def __repr__(self):
return "Transform: rot: %s loc:%s" % (self.getRot(), self.getLoc())
def copy(self):
"returns copy of self"
t = Transform()
t.scale = self.scale
t.translation = self.translation
t.rotation = self.rotation
t.scaleOrientation = self.scaleOrientation
return t
class BID:
"Blender named Object ID"
def __init__(self, name):
self.name = name
self.data = None
class BScene:
def __init__(self, name = None):
from Blender import Scene
self.dict = {'Image': {}, 'Object':{}, 'Mesh' : {}}
self.name = name
def __getitem__(self, name):
return self.dict[name]
def __setitem__(self, name, val):
self.dict[name] = val
def has_key(self, name):
if self.dict.has_key(name):
return 1
else:
return 0
def getnewID(self, templ):
n = 0
name = templ
while self.dict.has_key(name):
n += 1
name = "%s.%03d" % (templ, n)
return name
class BSGNode:
"Blender Scenegraph node"
isRoot = 0
def __init__(self, object = None, type = "", name = ""):
self.type = type
self.name = name
self.children = []
self.level = 0
self.object = object
def addChildren(self, children):
self.children += children
def traverse(self, visitor):
ret = visitor()
for c in self.children:
c.traverse(visitor)
return ret
def setDepth(self, level):
self.level = level
for c in self.children:
c.setDepth(level + 1)
def update(self):
ob.name = self.name
def __repr__(self):
l = self.level
children = ""
pre = l * ' '
return "\n%s%s [%s] ->%s" % (pre, self.name, self.type, self.children)
class ObjectNode(BSGNode):
def __init__(self, object = None, type = "", name = ""):
self.transform = Transform()
self.scene = Scene.getCurrent()
BSGNode.__init__(self, object, type, name)
def makeParent(self, child):
self.child = parent
child.parent = self
def clone(self):
ob = self.object
newob = ob.copy()
self.scene.link(newob)
new = ObjectNode(newob)
new.transform = self.transform.copy()
return new
def insert(self, child):
self.children.append(child)
child.level = self.level + 1
ob = child.object
self.object.makeParent([ob], 1, 1)
# first parent, THEN set local transform
child.update()
def applyTransform(self, tf):
self.transform = tf * self.transform
def update(self):
ob = self.object
t = self.transform
ob.loc = t.getLoc()
ob.size = t.getSize()
ob.rot = t.getRot()
ob.name = self.name
def NodefromData(ob, type, name):
new = ObjectNode(None, type, name)
if ob:
obj = ob
else:
obj = Object.New(type)
Scene.getCurrent().link(obj)
if not obj:
raise RuntimeError, "FATAL: could not create object"
new.object= obj
new.object.name = name
#new.fromData(ob)
return new
class RootNode(ObjectNode):
"""stupid simple scenegraph prototype"""
level = 0
isRoot = 1
type = 'Root'
name = 'ROOT'
def __init__(self, object = None, type = "", name = ""):
from Blender import Scene
self.transform = Transform()
BSGNode.__init__(self, object, type, name)
self.scene = Scene.getCurrent()
def insert(self, child):
child.update()
self.children.append(child)
def update(self):
self.scene.update()
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