X-Git-Url: https://git.ao2.it/vrm.git/blobdiff_plain/3761107280d20fdc779f71b8a60358c3639a074f..08e34a873729c718a510ec642d36eebaef6f4ee7:/vrm.py
diff --git a/vrm.py b/vrm.py
index bd61a58..d85b085 100755
--- a/vrm.py
+++ b/vrm.py
@@ -34,7 +34,7 @@ Tooltip: 'Vector Rendering Method Export Script 0.3'
#
# Additional credits:
# Thanks to Emilio Aguirre for S2flender from which I took inspirations :)
-# Thanks to Anthony C. D'Agostino for the backface.py script
+# Thanks to Anthony C. D'Agostino for the original backface.py script
#
# ---------------------------------------------------------------------
@@ -50,187 +50,141 @@ from math import *
#
# ---------------------------------------------------------------------
-class Projection:
- def __init__(self):
- print "New projection"
-
-class PerspectiveProjection(Projection):
- def __init___(self):
- Projection.__init__(self)
- print "Perspective"
-
- def doProjection():
- print "do a perspective projection!!"
-
-def Perspective(fovy, aspect, near, far):
- top = near * tan(fovy * pi / 360.0)
- bottom = -top
- left = bottom*aspect
- right= top*aspect
- x = (2.0 * near) / (right-left)
- y = (2.0 * near) / (top-bottom)
- a = (right+left) / (right-left)
- b = (top+bottom) / (top - bottom)
- c = - ((far+near) / (far-near))
- d = - ((2*far*near)/(far-near))
- return Matrix([x,0.0,a,0.0],[0.0,y,b,0.0],[0.0,0.0,c,d],[0.0,0.0,-1.0,0.0])
-
-def flatten_new(v, cameraObj, canvasSize, obMesh):
-
- cam = cameraObj.getInverseMatrix()
- cam.transpose()
-
- # Changing the view mode
- cmra = cameraObj.getData()
-
- #if cmra.type:
- # print "Ortho"
- #m2 = Ortho(fovy,float(w*ax)/float(h*ay),cmra.clipStart, cmra.clipEnd,17) #cmra.scale)
- #else:
- # print "Perspective"
-
- #Create Frustum
- #frustum = _Frustum(cam,m2)
+class Projector:
+ """Calculate the projection of an object given the camera.
- m1 = Matrix()
- mP = Matrix()
+ A projector is useful to so some per-object transformation to obtain the
+ projection of an object given the camera.
- fovy = atan(0.5/(float(canvasSize[0])/float(canvasSize[1]))/(cmra.lens/32))
- fovy = fovy * 360/pi
+ The main method is #doProjection# see the method description for the
+ parameter list.
+ """
- m2 = Perspective(fovy,float(canvasSize[0])/float(canvasSize[1]),cmra.clipStart, cmra.clipEnd)
+ def __init__(self, cameraObj, obMesh, canvasSize):
+ """Calculate the projection matrix.
- m1 = obMesh.matrixWorld #mat
- m1.transpose()
- mP = cam * m1
- mP = m2 * mP
-
- #Transform the vertices to global coordinates
- p = mP*Vector([v.co[0],v.co[1],v.co[2],1.0])
- #tf.append(p)
- #p = m1*Vector([v.co[0],v.co[1],v.co[2],1.0])
- #t2.append([p[0],p[1],p[2]])
-
- mW = canvasSize[0]/2
- mH = canvasSize[1]/2
-
- if p[3]<=0:
- p[0] = int(p[0]*mW)+mW
- p[1] = int(p[1]*mH)+mH
- else:
- p[0] = int((p[0]/p[3])*mW)+mW
- p[1] = int((p[1]/p[3])*mH)+mH
-
- # Mirror and translate along y
- p[1] *= -1
- p[1] += canvasSize[1]
-
- return p
+ The projection matrix depends, in this case, on the camera settings,
+ and also on object transformation matrix.
+ """
+ self.size = canvasSize
+ camera = cameraObj.getData()
-# distance from camera Z'
-def Distance(PX,PY,PZ):
-
- dist = sqrt(PX*PX+PY*PY+PZ*PZ)
- return dist
+ aspect = float(canvasSize[0])/float(canvasSize[1])
+ near = camera.clipStart
+ far = camera.clipEnd
-def RotatePoint(PX,PY,PZ,AngleX,AngleY,AngleZ):
-
- NewPoint = []
- # Rotate X
- NewY = (PY * cos(AngleX))-(PZ * sin(AngleX))
- NewZ = (PZ * cos(AngleX))+(PY * sin(AngleX))
- # Rotate Y
- PZ = NewZ
- PY = NewY
- NewZ = (PZ * cos(AngleY))-(PX * sin(AngleY))
- NewX = (PX * cos(AngleY))+(PZ * sin(AngleY))
- PX = NewX
- PZ = NewZ
- # Rotate Z
- NewX = (PX * cos(AngleZ))-(PY * sin(AngleZ))
- NewY = (PY * cos(AngleZ))+(PX * sin(AngleZ))
- NewPoint.append(NewX)
- NewPoint.append(NewY)
- NewPoint.append(NewZ)
- return NewPoint
+ fovy = atan(0.5/aspect/(camera.lens/32))
+ fovy = fovy * 360/pi
+
+ # What projection do we want?
+ if camera.type:
+ m2 = self._calcOrthoMatrix(fovy, aspect, near, far, 17) #camera.scale)
+ else:
+ m2 = self._calcPerspectiveMatrix(fovy, aspect, near, far)
+
-def flatten(vertx, verty, vertz, cameraObj, canvasSize):
+ # View transformation
+ cam = Matrix(cameraObj.getInverseMatrix())
+ cam.transpose()
- camera = cameraObj.getData()
- Lens = camera.getLens() # The Camera lens
+ m1 = Matrix(obMesh.getMatrix())
+ m1.transpose()
+
+ mP = cam * m1
+ mP = m2 * mP
- xres = canvasSize[0] # X res for output
- yres = canvasSize[1] # Y res for output
- ratio = xres/yres
+ self.projectionMatrix = mP
- fov = atan(ratio * 16.0 / Lens) # Get fov stuff
-
- dist = xres/2*tan(fov) # Calculate dist from pinhole camera to image plane
+ ##
+ # Public methods
+ #
- screenxy=[0,0,vertz]
- x=-vertx
- y=verty
- z=vertz
+ def doProjection(self, v):
+ """Project the point on the view plane.
- #----------------------------
- # calculate x'=dist*x/z & y'=dist*x/z
- #----------------------------
- screenxy[0]=int(xres/2.0+4*x*dist/z)
- screenxy[1]=int(yres/2.0+4*y*dist/z)
- return screenxy
+ Given a vertex calculate the projection using the current projection
+ matrix.
+ """
+
+ # Note that we need the vertex expressed using homogeneous coordinates
+ p = self.projectionMatrix * Vector([v[0], v[1], v[2], 1.0])
+
+ mW = self.size[0]/2
+ mH = self.size[1]/2
+
+ if p[3]<=0:
+ p[0] = round(p[0]*mW)+mW
+ p[1] = round(p[1]*mH)+mH
+ else:
+ p[0] = round((p[0]/p[3])*mW)+mW
+ p[1] = round((p[1]/p[3])*mH)+mH
+
+ # For now we want (0,0) in the top-left corner of the canvas
+ # Mirror and translate along y
+ p[1] *= -1
+ p[1] += self.size[1]
+
+ return p
-## Backface culling routine
-#
+ ##
+ # Private methods
+ #
+
+ def _calcPerspectiveMatrix(self, fovy, aspect, near, far):
+ """Return a perspective projection matrix."""
+
+ top = near * tan(fovy * pi / 360.0)
+ bottom = -top
+ left = bottom*aspect
+ right= top*aspect
+ x = (2.0 * near) / (right-left)
+ y = (2.0 * near) / (top-bottom)
+ a = (right+left) / (right-left)
+ b = (top+bottom) / (top - bottom)
+ c = - ((far+near) / (far-near))
+ d = - ((2*far*near)/(far-near))
+
+ m = Matrix(
+ [x, 0.0, a, 0.0],
+ [0.0, y, b, 0.0],
+ [0.0, 0.0, c, d],
+ [0.0, 0.0, -1.0, 0.0])
-def isFaceVisible(face, obj, cameraObj):
- """
- Determine if the face is visible from the current camera.
- """
- numvert = len(face)
- # backface culling
- a = []
- a.append(face[0][0])
- a.append(face[0][1])
- a.append(face[0][2])
- a = RotatePoint(a[0], a[1], a[2], obj.RotX, obj.RotY, obj.RotZ)
- a[0] += obj.LocX - cameraObj.LocX
- a[1] += obj.LocY - cameraObj.LocY
- a[2] += obj.LocZ - cameraObj.LocZ
- b = []
- b.append(face[1][0])
- b.append(face[1][1])
- b.append(face[1][2])
- b = RotatePoint(b[0], b[1], b[2], obj.RotX, obj.RotY, obj.RotZ)
- b[0] += obj.LocX - cameraObj.LocX
- b[1] += obj.LocY - cameraObj.LocY
- b[2] += obj.LocZ - cameraObj.LocZ
- c = []
- c.append(face[numvert-1][0])
- c.append(face[numvert-1][1])
- c.append(face[numvert-1][2])
- c = RotatePoint(c[0], c[1], c[2], obj.RotX, obj.RotY, obj.RotZ)
- c[0] += obj.LocX - cameraObj.LocX
- c[1] += obj.LocY - cameraObj.LocY
- c[2] += obj.LocZ - cameraObj.LocZ
-
- norm = [0,0,0]
- norm[0] = (b[1] - a[1])*(c[2] - a[2]) - (c[1] - a[1])*(b[2] - a[2])
- norm[1] = -((b[0] - a[0])*(c[2] - a[2]) - (c[0] - a[0])*(b[2] - a[2]))
- norm[2] = (b[0] - a[0])*(c[1] - a[1]) - (c[0] - a[0])*(b[1] - a[1])
-
- d = norm[0]*a[0] + norm[1]*a[1] + norm[2]*a[2]
- return (d<0)
+ return m
+
+ def _calcOrthoMatrix(self, fovy, aspect , near, far, scale):
+ """Return an orthogonal projection matrix."""
+
+ top = near * tan(fovy * pi / 360.0) * (scale * 10)
+ bottom = -top
+ left = bottom * aspect
+ right= top * aspect
+ rl = right-left
+ tb = top-bottom
+ fn = near-far
+ tx = -((right+left)/rl)
+ ty = -((top+bottom)/tb)
+ tz = ((far+near)/fn)
+
+ m = Matrix(
+ [2.0/rl, 0.0, 0.0, tx],
+ [0.0, 2.0/tb, 0.0, ty],
+ [0.0, 0.0, 2.0/fn, tz],
+ [0.0, 0.0, 0.0, 1.0])
+
+ return m
# ---------------------------------------------------------------------
#
-## Mesh representation class
+## Object representation class
#
# ---------------------------------------------------------------------
# TODO: a class to represent the needed properties of a 2D vector image
+# Just use a NMesh structure?
# ---------------------------------------------------------------------
@@ -262,13 +216,14 @@ class VectorWriter:
self.canvasSize = canvasSize
+ ##
# Public Methods
#
def printCanvas(mesh):
return
-
+ ##
# Private Methods
#
@@ -293,21 +248,29 @@ class SVGVectorWriter(VectorWriter):
VectorWriter.__init__(self, file, canvasSize)
+ ##
# Public Methods
#
- def printCanvas(self, mesh):
- """Convert the mesh representation to SVG."""
+ def printCanvas(self, scene):
+ """Convert the scene representation to SVG."""
self._printHeader()
- for obj in mesh:
- for face in obj:
+ Objects = scene.getChildren()
+ for obj in Objects:
+ self.file.write("\n")
+
+ for face in obj.getData().faces:
self._printPolygon(face)
+
+ self._printWireframe(obj.getData())
+
+ self.file.write("\n")
self._printFooter()
-
+ ##
# Private Methods
#
@@ -315,7 +278,9 @@ class SVGVectorWriter(VectorWriter):
"""Print SVG header."""
self.file.write("\n")
- self.file.write("