Hi!
Can I import the smoothing groups included in an .obj file into Houdini?
Thanks for any help
How do I import .obj with smoothing groups?
6243 4 0- EmAr
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Thanks for the suggestion, I'll give it a try but obj format does support smoothing groups via vertex normals as far as I know. Here's the .obj output of the same box, with and without smoothing respectively. They have pretty different vertex normals data and they show different smoothing groups when imported back into a program other than Houdini.
# Wavefront OBJ exported by MilkShape 3D
v -20.000000 20.000000 20.000000
v -20.000000 -20.000000 20.000000
v 20.000000 20.000000 20.000000
v 20.000000 -20.000000 20.000000
v 20.000000 20.000000 -20.000000
v 20.000000 -20.000000 -20.000000
v -20.000000 20.000000 -20.000000
v -20.000000 -20.000000 -20.000000
# 8 vertices
vt 0.000000 1.000000
vt 0.000000 0.000000
vt 1.000000 1.000000
vt 1.000000 0.000000
# 4 texture coordinates
vn -0.666667 0.666667 0.333333
vn -0.408248 -0.408248 0.816497
vn 0.408248 0.408248 0.816497
vn 0.666667 -0.666667 0.333333
vn 0.666667 0.666667 -0.333333
vn 0.408248 -0.408248 -0.816497
vn -0.408248 0.408248 -0.816497
vn -0.666667 -0.666667 -0.333333
# 8 normals
g Box05
s 1
f 1/1/1 2/2/2 3/3/3
f 2/2/2 4/4/4 3/3/3
f 3/1/3 4/2/4 5/3/5
f 4/2/4 6/4/6 5/3/5
f 5/1/5 6/2/6 7/3/7
f 6/2/6 8/4/8 7/3/7
f 7/1/7 8/2/8 1/3/1
f 8/2/8 2/4/2 1/3/1
f 7/1/7 1/2/1 5/3/5
f 1/2/1 3/4/3 5/3/5
f 2/1/2 8/2/8 4/3/4
f 8/2/8 6/4/6 4/3/4
# 12 triangles in group
# 12 triangles total
# Wavefront OBJ exported by MilkShape 3D
v -20.000000 20.000000 20.000000
v -20.000000 -20.000000 20.000000
v 20.000000 20.000000 20.000000
v 20.000000 -20.000000 20.000000
v 20.000000 20.000000 -20.000000
v 20.000000 -20.000000 -20.000000
v -20.000000 20.000000 -20.000000
v -20.000000 -20.000000 -20.000000
# 8 vertices
vt 0.000000 1.000000
vt 0.000000 0.000000
vt 1.000000 1.000000
vt 1.000000 0.000000
# 4 texture coordinates
vn 0.000000 0.000000 1.000000
vn 1.000000 0.000000 0.000000
vn 0.000000 0.000000 -1.000000
vn -1.000000 0.000000 0.000000
vn 0.000000 1.000000 0.000000
vn 0.000000 -1.000000 0.000000
# 6 normals
g Box05
s 1
f 1/1/1 2/2/1 3/3/1
f 2/2/1 4/4/1 3/3/1
s 2
f 3/1/2 4/2/2 5/3/2
f 4/2/2 6/4/2 5/3/2
s 1
f 5/1/3 6/2/3 7/3/3
f 6/2/3 8/4/3 7/3/3
s 2
f 7/1/4 8/2/4 1/3/4
f 8/2/4 2/4/4 1/3/4
s 3
f 7/1/5 1/2/5 5/3/5
f 1/2/5 3/4/5 5/3/5
f 2/1/6 8/2/6 4/3/6
f 8/2/6 6/4/6 4/3/6
# 12 triangles in group
# 12 triangles total
# Wavefront OBJ exported by MilkShape 3D
v -20.000000 20.000000 20.000000
v -20.000000 -20.000000 20.000000
v 20.000000 20.000000 20.000000
v 20.000000 -20.000000 20.000000
v 20.000000 20.000000 -20.000000
v 20.000000 -20.000000 -20.000000
v -20.000000 20.000000 -20.000000
v -20.000000 -20.000000 -20.000000
# 8 vertices
vt 0.000000 1.000000
vt 0.000000 0.000000
vt 1.000000 1.000000
vt 1.000000 0.000000
# 4 texture coordinates
vn -0.666667 0.666667 0.333333
vn -0.408248 -0.408248 0.816497
vn 0.408248 0.408248 0.816497
vn 0.666667 -0.666667 0.333333
vn 0.666667 0.666667 -0.333333
vn 0.408248 -0.408248 -0.816497
vn -0.408248 0.408248 -0.816497
vn -0.666667 -0.666667 -0.333333
# 8 normals
g Box05
s 1
f 1/1/1 2/2/2 3/3/3
f 2/2/2 4/4/4 3/3/3
f 3/1/3 4/2/4 5/3/5
f 4/2/4 6/4/6 5/3/5
f 5/1/5 6/2/6 7/3/7
f 6/2/6 8/4/8 7/3/7
f 7/1/7 8/2/8 1/3/1
f 8/2/8 2/4/2 1/3/1
f 7/1/7 1/2/1 5/3/5
f 1/2/1 3/4/3 5/3/5
f 2/1/2 8/2/8 4/3/4
f 8/2/8 6/4/6 4/3/4
# 12 triangles in group
# 12 triangles total
# Wavefront OBJ exported by MilkShape 3D
v -20.000000 20.000000 20.000000
v -20.000000 -20.000000 20.000000
v 20.000000 20.000000 20.000000
v 20.000000 -20.000000 20.000000
v 20.000000 20.000000 -20.000000
v 20.000000 -20.000000 -20.000000
v -20.000000 20.000000 -20.000000
v -20.000000 -20.000000 -20.000000
# 8 vertices
vt 0.000000 1.000000
vt 0.000000 0.000000
vt 1.000000 1.000000
vt 1.000000 0.000000
# 4 texture coordinates
vn 0.000000 0.000000 1.000000
vn 1.000000 0.000000 0.000000
vn 0.000000 0.000000 -1.000000
vn -1.000000 0.000000 0.000000
vn 0.000000 1.000000 0.000000
vn 0.000000 -1.000000 0.000000
# 6 normals
g Box05
s 1
f 1/1/1 2/2/1 3/3/1
f 2/2/1 4/4/1 3/3/1
s 2
f 3/1/2 4/2/2 5/3/2
f 4/2/2 6/4/2 5/3/2
s 1
f 5/1/3 6/2/3 7/3/3
f 6/2/3 8/4/3 7/3/3
s 2
f 7/1/4 8/2/4 1/3/4
f 8/2/4 2/4/4 1/3/4
s 3
f 7/1/5 1/2/5 5/3/5
f 1/2/5 3/4/5 5/3/5
f 2/1/6 8/2/6 4/3/6
f 8/2/6 6/4/6 4/3/6
# 12 triangles in group
# 12 triangles total
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