Hi all,
find attached a patch for blender's ac3d_export.py
It contains three modifications:
- properly handle modifiers (e.g. Subsurf, Mirror, Boolean)
- properly handle material indices attached to the object instead of the
mesh
- export face vertices in clockwise order looking along the normal
specified in Blender. This also properly handles multiple mirrored
copies of the same mesh, e.g. left and right cockpit door.
This should solve many of the normals issues with the Blender AC3D export.
I'll submit this patch also to William Germano, the current maintainer
of ac3d_export.py.
You'll have to apply the patch using "patch -p0".
Cheers,
Ralf
Index: ac3d_export.py
===================================================================
RCS file: /cvsroot/bf-blender/blender/release/scripts/ac3d_export.py,v
retrieving revision 1.15
diff -u -b -r1.15 ac3d_export.py
--- ac3d_export.py 18 Jun 2006 19:05:51 -0000 1.15
+++ ac3d_export.py 21 Nov 2006 12:51:11 -0000
@@ -96,6 +96,7 @@
import Blender
from Blender import sys as bsys
from Blender import Mathutils
+import Blender.NMesh
# Globals
ERROR_MSG = '' # popup error msg
@@ -347,7 +348,8 @@
self.kids(kidsnum)
if objtype == 'Mesh':
- mesh = self.mesh = obj.getData()
+ mesh = self.mesh = Blender.NMesh.GetRawFromObject(obj.name)
+ # Transform the mesh to worldspace, don't recalc the normals
meshes = self.split_mesh(mesh)
if len(meshes) > 1:
if NO_SPLIT or self.dont_split(objname):
@@ -454,8 +456,8 @@
if texline: file.write(texline)
if AC3D_4:
self.crease(mesh.getMaxSmoothAngle())
- self.numvert(mesh.verts, obj.getMatrix())
- self.numsurf(mesh.faces, mesh.hasFaceUV(), foomesh)
+ self.numvert(mesh.verts,obj.getMatrix())
+ self.numsurf(mesh.faces, mesh.hasFaceUV(), obj.getMatrix(), foomesh)
def MATERIALS(self, meshlist):
for meobj in meshlist:
@@ -551,13 +553,13 @@
def numvert(self, verts, matrix):
file = self.file
file.write("numvert %s\n" % len(verts))
- m = matrix * acmatrix
+ m = matrix*acmatrix
verts = transform_verts(verts, m)
for v in verts:
v0, v1, v2 = Round(v[0]), Round(v[1]), Round(v[2])
file.write("%s %s %s\n" % (v0, v1, v2))
- def numsurf(self, faces, hasFaceUV, foomesh = False):
+ def numsurf(self, faces, hasFaceUV, matrix, foomesh = False):
global ADD_DEFAULT_MAT, MATIDX_ERROR
file = self.file
@@ -568,14 +570,22 @@
mlist = self.mlist
omlist = {}
- objmats = self.mesh.materials[:]
+ objmats = self.obj.getMaterials()[:]
+ meshmats = self.mesh.materials[:]
matidx_error_told = 0
for i in range(len(objmats)):
objmats[i] = objmats[i].name
+ for i in range(len(meshmats)):
+ meshmats[i] = meshmats[i].name
for f in faces:
m_idx = f.materialIndex
+ old_m_idx=m_idx
try:
+ if (m_idx<len(objmats) and objmats[m_idx] is not None):
m_idx = mlist.index(objmats[m_idx])
+ else:
+ m_idx = mlist.index(meshmats[m_idx])
+ if ADD_DEFAULT_MAT: m_idx += 1
except IndexError:
if not MATIDX_ERROR:
rdat = REPORT_DATA['warns']
@@ -599,11 +609,11 @@
two_side = (two_side > 0) << 1
flaghigh = f.smooth | two_side
surfstr = "SURF 0x%d%d\n" % (flaghigh, flaglow)
- if ADD_DEFAULT_MAT and objmats: m_idx += 1
matstr = "mat %s\n" % m_idx
refstr = "refs %s\n" % refs
u, v, vi = 0, 0, 0
fvstr = []
+ self.invertface(f,verts,foomesh,matrix)
if foomesh:
for vert in f.v:
fvstr.append(str(vert.index))
@@ -625,6 +635,28 @@
file.write("%s%s%s%s" % (surfstr, matstr, refstr, fvstr))
+ def invertface(self,f,verts,foomesh,matrix):
+ if foomesh:
+ v0=f.v[0].v.co
+ v1=f.v[1].v.co
+ v2=f.v[2].v.co
+ else:
+ v0=f.v[0].co
+ v1=f.v[1].co
+ v2=f.v[2].co
+ v0=v0*matrix
+ v1=v1*matrix
+ v2=v2*matrix
+ norig=Mathutils.Vector(f.no)*matrix.rotationPart()
+ nnew=Mathutils.TriangleNormal(v0,v1,v2)
+ dir=norig*nnew
+ if dir>=0:
+ return
+ f.col.reverse()
+ f.uv.reverse()
+ f.v.reverse()
+
+
# End of Class AC3DExport
from Blender.Window import FileSelector
-------------------------------------------------------------------------
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