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How do I shift a vertex to establish a single, flat surface on a quad?
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One thing that I've noticed when drawing quads is that, if a single surface cannot be established using the vertex arrangement (for example, if you add the default plane and raise a single vertex to 1 on the Z-axis), Blender will treat it a quad (subsurf works fine with it and will smooth it out into a hyperbolic surface) but render it as two conjoined tris (prior to the subsurf).
Now, I'm fairly certain that I should avoid this in most cases and would want to fix it if it does occur. In my example above, I could obviously just shift the vertex back to 0 on the Z-axis, because the surface is completely flat. However, if I were to rotate this quad, I would be in a situation where moving the vertex to establish a flat surface would require very precise changes to the X, Y, and Z positions.
I was wondering if there is some feature of Blender or a technique to adjust vertices exactly that the quad is absolutely flat, even if the quad is rotated.
P.S. I apologize for the very technical and possibly pedantic style of writing. Because I want to ensure the question is communicated clearly, I felt that it was necessary to be scrupulous.
mesh vertices geometry
asked 5 hours ago
thepufferfish
112
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up vote
2
down vote
favorite
One thing that I've noticed when drawing quads is that, if a single surface cannot be established using the vertex arrangement (for example, if you add the default plane and raise a single vertex to 1 on the Z-axis), Blender will treat it a quad (subsurf works fine with it and will smooth it out into a hyperbolic surface) but render it as two conjoined tris (prior to the subsurf).
Now, I'm fairly certain that I should avoid this in most cases and would want to fix it if it does occur. In my example above, I could obviously just shift the vertex back to 0 on the Z-axis, because the surface is completely flat. However, if I were to rotate this quad, I would be in a situation where moving the vertex to establish a flat surface would require very precise changes to the X, Y, and Z positions.
I was wondering if there is some feature of Blender or a technique to adjust vertices exactly that the quad is absolutely flat, even if the quad is rotated.
P.S. I apologize for the very technical and possibly pedantic style of writing. Because I want to ensure the question is communicated clearly, I felt that it was necessary to be scrupulous.
mesh vertices geometry
asked 5 hours ago
thepufferfish
112
New contributor
thepufferfish is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Related blender.stackexchange.com/questions/35193/…
– Mr Zak
3 mins ago
add a comment |Â
up vote
2
down vote
favorite
up vote
2
down vote
favorite
One thing that I've noticed when drawing quads is that, if a single surface cannot be established using the vertex arrangement (for example, if you add the default plane and raise a single vertex to 1 on the Z-axis), Blender will treat it a quad (subsurf works fine with it and will smooth it out into a hyperbolic surface) but render it as two conjoined tris (prior to the subsurf).
Now, I'm fairly certain that I should avoid this in most cases and would want to fix it if it does occur. In my example above, I could obviously just shift the vertex back to 0 on the Z-axis, because the surface is completely flat. However, if I were to rotate this quad, I would be in a situation where moving the vertex to establish a flat surface would require very precise changes to the X, Y, and Z positions.
I was wondering if there is some feature of Blender or a technique to adjust vertices exactly that the quad is absolutely flat, even if the quad is rotated.
P.S. I apologize for the very technical and possibly pedantic style of writing. Because I want to ensure the question is communicated clearly, I felt that it was necessary to be scrupulous.
mesh vertices geometry
asked 5 hours ago
thepufferfish
112
New contributor
thepufferfish is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
One thing that I've noticed when drawing quads is that, if a single surface cannot be established using the vertex arrangement (for example, if you add the default plane and raise a single vertex to 1 on the Z-axis), Blender will treat it a quad (subsurf works fine with it and will smooth it out into a hyperbolic surface) but render it as two conjoined tris (prior to the subsurf).
Now, I'm fairly certain that I should avoid this in most cases and would want to fix it if it does occur. In my example above, I could obviously just shift the vertex back to 0 on the Z-axis, because the surface is completely flat. However, if I were to rotate this quad, I would be in a situation where moving the vertex to establish a flat surface would require very precise changes to the X, Y, and Z positions.
I was wondering if there is some feature of Blender or a technique to adjust vertices exactly that the quad is absolutely flat, even if the quad is rotated.
P.S. I apologize for the very technical and possibly pedantic style of writing. Because I want to ensure the question is communicated clearly, I felt that it was necessary to be scrupulous.
mesh vertices geometry
mesh vertices geometry
asked 5 hours ago
thepufferfish
112
New contributor
thepufferfish is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 5 hours ago
thepufferfish
112
New contributor
thepufferfish is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 5 hours ago
asked 5 hours ago
thepufferfish
112
New contributor
thepufferfish is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 5 hours ago
thepufferfish
112
asked 5 hours ago
thepufferfish
112
112
New contributor
thepufferfish is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
thepufferfish is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
thepufferfish is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Related blender.stackexchange.com/questions/35193/…
– Mr Zak
3 mins ago
add a comment |Â
Related blender.stackexchange.com/questions/35193/…
– Mr Zak
3 mins ago
Related blender.stackexchange.com/questions/35193/…
– Mr Zak
3 mins ago
Related blender.stackexchange.com/questions/35193/…
– Mr Zak
3 mins ago
add a comment |Â
2 Answers
2
active
oldest
votes
up vote
1
down vote
If you only care about planar faces in general, then there's an automatic way for that by selecting Mesh > Clean Up > Make Planar Faces.
If you really want to only move a specific vertex of the quad, you can
- move the 3D Cursor to one of the three other vertices (Select the vertex, Shift+S > Cursor to Selected) and switch to Pivot Point > 3D Cursor (. key)
Shift-select all three vertices that should define your plane and should not move- Hit Ctrl+Alt+Space to define a custom Transform Orientation
- Select the vertex that you want to move and scale it locally along the Z-axis of the new transform orientation: SZZ
0Enter
answered 3 hours ago
binweg
2,0311412
I knew it had to be somewhere ... of course, my meshes never need cleaning up... so I've never found that button ¦ l
– Robin Betts
30 mins ago
add a comment |Â
up vote
0
down vote
This should be possible via python. Basically you rotate the vertex in question around the origin by the difference between the normals of the two planar faces of the non-planar quad.
import bmesh
import bpy
bm = bmesh.from_edit_mesh(bpy.context.object.data)
vert = [v for v in bm.verts if v.select == True][0]
face = vert.link_faces[0]#Assuming single linked face
i = [i for i in range(0, len(face.verts)) if face.verts[i] == vert][0]
next = face.verts[(i+1)%4]#quad
prev = face.verts[(i-1)%4]
opp = face.verts[(i+2)%4]
f1 = bm.faces.new([prev, vert, next])
f2 = bm.faces.new([next, opp, prev])
f1.normal_update()
f2.normal_update()
quat = f1.normal.rotation_difference(f2.normal)
bmesh.ops.rotate(bm, cent=(0,0,0), matrix=quat.to_matrix(), verts=[vert])
bm.faces.remove(f1)
bm.faces.remove(f2)
bpy.ops.object.mode_set(mode = 'OBJECT', toggle = False)
answered 56 mins ago
Blender Dadaist
46317
add a comment |Â
2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
1
down vote
If you only care about planar faces in general, then there's an automatic way for that by selecting Mesh > Clean Up > Make Planar Faces.
If you really want to only move a specific vertex of the quad, you can
- move the 3D Cursor to one of the three other vertices (Select the vertex, Shift+S > Cursor to Selected) and switch to Pivot Point > 3D Cursor (. key)
Shift-select all three vertices that should define your plane and should not move- Hit Ctrl+Alt+Space to define a custom Transform Orientation
- Select the vertex that you want to move and scale it locally along the Z-axis of the new transform orientation: SZZ
0Enter
answered 3 hours ago
binweg
2,0311412
I knew it had to be somewhere ... of course, my meshes never need cleaning up... so I've never found that button ¦ l
– Robin Betts
30 mins ago
add a comment |Â
up vote
1
down vote
If you only care about planar faces in general, then there's an automatic way for that by selecting Mesh > Clean Up > Make Planar Faces.
If you really want to only move a specific vertex of the quad, you can
- move the 3D Cursor to one of the three other vertices (Select the vertex, Shift+S > Cursor to Selected) and switch to Pivot Point > 3D Cursor (. key)
Shift-select all three vertices that should define your plane and should not move- Hit Ctrl+Alt+Space to define a custom Transform Orientation
- Select the vertex that you want to move and scale it locally along the Z-axis of the new transform orientation: SZZ
0Enter
answered 3 hours ago
binweg
2,0311412
I knew it had to be somewhere ... of course, my meshes never need cleaning up... so I've never found that button ¦ l
– Robin Betts
30 mins ago
add a comment |Â
up vote
1
down vote
up vote
1
down vote
If you only care about planar faces in general, then there's an automatic way for that by selecting Mesh > Clean Up > Make Planar Faces.
If you really want to only move a specific vertex of the quad, you can
- move the 3D Cursor to one of the three other vertices (Select the vertex, Shift+S > Cursor to Selected) and switch to Pivot Point > 3D Cursor (. key)
Shift-select all three vertices that should define your plane and should not move- Hit Ctrl+Alt+Space to define a custom Transform Orientation
- Select the vertex that you want to move and scale it locally along the Z-axis of the new transform orientation: SZZ
0Enter
answered 3 hours ago
binweg
2,0311412
If you only care about planar faces in general, then there's an automatic way for that by selecting Mesh > Clean Up > Make Planar Faces.
If you really want to only move a specific vertex of the quad, you can
- move the 3D Cursor to one of the three other vertices (Select the vertex, Shift+S > Cursor to Selected) and switch to Pivot Point > 3D Cursor (. key)
Shift-select all three vertices that should define your plane and should not move- Hit Ctrl+Alt+Space to define a custom Transform Orientation
- Select the vertex that you want to move and scale it locally along the Z-axis of the new transform orientation: SZZ
0Enter
answered 3 hours ago
binweg
2,0311412
edited 58 mins ago
answered 3 hours ago
binweg
2,0311412
answered 3 hours ago
binweg
2,0311412
answered 3 hours ago
binweg
2,0311412
2,0311412
I knew it had to be somewhere ... of course, my meshes never need cleaning up... so I've never found that button ¦ l
– Robin Betts
30 mins ago
add a comment |Â
I knew it had to be somewhere ... of course, my meshes never need cleaning up... so I've never found that button ¦ l
– Robin Betts
30 mins ago
I knew it had to be somewhere ... of course, my meshes never need cleaning up... so I've never found that button ¦ l
– Robin Betts
30 mins ago
I knew it had to be somewhere ... of course, my meshes never need cleaning up... so I've never found that button ¦ l
– Robin Betts
30 mins ago
add a comment |Â
up vote
0
down vote
This should be possible via python. Basically you rotate the vertex in question around the origin by the difference between the normals of the two planar faces of the non-planar quad.
import bmesh
import bpy
bm = bmesh.from_edit_mesh(bpy.context.object.data)
vert = [v for v in bm.verts if v.select == True][0]
face = vert.link_faces[0]#Assuming single linked face
i = [i for i in range(0, len(face.verts)) if face.verts[i] == vert][0]
next = face.verts[(i+1)%4]#quad
prev = face.verts[(i-1)%4]
opp = face.verts[(i+2)%4]
f1 = bm.faces.new([prev, vert, next])
f2 = bm.faces.new([next, opp, prev])
f1.normal_update()
f2.normal_update()
quat = f1.normal.rotation_difference(f2.normal)
bmesh.ops.rotate(bm, cent=(0,0,0), matrix=quat.to_matrix(), verts=[vert])
bm.faces.remove(f1)
bm.faces.remove(f2)
bpy.ops.object.mode_set(mode = 'OBJECT', toggle = False)
answered 56 mins ago
Blender Dadaist
46317
add a comment |Â
up vote
0
down vote
This should be possible via python. Basically you rotate the vertex in question around the origin by the difference between the normals of the two planar faces of the non-planar quad.
import bmesh
import bpy
bm = bmesh.from_edit_mesh(bpy.context.object.data)
vert = [v for v in bm.verts if v.select == True][0]
face = vert.link_faces[0]#Assuming single linked face
i = [i for i in range(0, len(face.verts)) if face.verts[i] == vert][0]
next = face.verts[(i+1)%4]#quad
prev = face.verts[(i-1)%4]
opp = face.verts[(i+2)%4]
f1 = bm.faces.new([prev, vert, next])
f2 = bm.faces.new([next, opp, prev])
f1.normal_update()
f2.normal_update()
quat = f1.normal.rotation_difference(f2.normal)
bmesh.ops.rotate(bm, cent=(0,0,0), matrix=quat.to_matrix(), verts=[vert])
bm.faces.remove(f1)
bm.faces.remove(f2)
bpy.ops.object.mode_set(mode = 'OBJECT', toggle = False)
answered 56 mins ago
Blender Dadaist
46317
add a comment |Â
up vote
0
down vote
up vote
0
down vote
This should be possible via python. Basically you rotate the vertex in question around the origin by the difference between the normals of the two planar faces of the non-planar quad.
import bmesh
import bpy
bm = bmesh.from_edit_mesh(bpy.context.object.data)
vert = [v for v in bm.verts if v.select == True][0]
face = vert.link_faces[0]#Assuming single linked face
i = [i for i in range(0, len(face.verts)) if face.verts[i] == vert][0]
next = face.verts[(i+1)%4]#quad
prev = face.verts[(i-1)%4]
opp = face.verts[(i+2)%4]
f1 = bm.faces.new([prev, vert, next])
f2 = bm.faces.new([next, opp, prev])
f1.normal_update()
f2.normal_update()
quat = f1.normal.rotation_difference(f2.normal)
bmesh.ops.rotate(bm, cent=(0,0,0), matrix=quat.to_matrix(), verts=[vert])
bm.faces.remove(f1)
bm.faces.remove(f2)
bpy.ops.object.mode_set(mode = 'OBJECT', toggle = False)
answered 56 mins ago
Blender Dadaist
46317
This should be possible via python. Basically you rotate the vertex in question around the origin by the difference between the normals of the two planar faces of the non-planar quad.
import bmesh
import bpy
bm = bmesh.from_edit_mesh(bpy.context.object.data)
vert = [v for v in bm.verts if v.select == True][0]
face = vert.link_faces[0]#Assuming single linked face
i = [i for i in range(0, len(face.verts)) if face.verts[i] == vert][0]
next = face.verts[(i+1)%4]#quad
prev = face.verts[(i-1)%4]
opp = face.verts[(i+2)%4]
f1 = bm.faces.new([prev, vert, next])
f2 = bm.faces.new([next, opp, prev])
f1.normal_update()
f2.normal_update()
quat = f1.normal.rotation_difference(f2.normal)
bmesh.ops.rotate(bm, cent=(0,0,0), matrix=quat.to_matrix(), verts=[vert])
bm.faces.remove(f1)
bm.faces.remove(f2)
bpy.ops.object.mode_set(mode = 'OBJECT', toggle = False)
answered 56 mins ago
Blender Dadaist
46317
answered 56 mins ago
Blender Dadaist
46317
answered 56 mins ago
Blender Dadaist
46317
answered 56 mins ago
Blender Dadaist
46317
46317
add a comment |Â
add a comment |Â
thepufferfish is a new contributor. Be nice, and check out our Code of Conduct.
thepufferfish is a new contributor. Be nice, and check out our Code of Conduct.
thepufferfish is a new contributor. Be nice, and check out our Code of Conduct.
thepufferfish is a new contributor. Be nice, and check out our Code of Conduct.
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Related blender.stackexchange.com/questions/35193/…
– Mr Zak
3 mins ago