extruded circle from vertex a to vertex b

Coding Python Support
#1

hi

how can i draw a an extruded circle from vertex a ( x1, y1, z1 ) to vertex b ( x2, y2 , z2 ) ?

so i draw the circle at vertex a:
bpy.ops.mesh.primitive_circle_add(vertices=16, radius=0.02, fill=True, view_align=False, enter_editmode=False, location=( x1, y1, z1 ), rotation=(0.0, 0.0, 0.0))

but how do i extrude to vertex b ?

thanks for any help
sc3*2

#2 

import bpy
from mathutils import Vector

# exectute while in object mode with nothing selected.
# no rotation
myVec1 = Vector((0,0,0))
myVec2 = Vector((0,2,1))
bpy.ops.mesh.primitive_circle_add(vertices=16, radius=0.42, fill=True, view_align=False, enter_editmode=False, location=myVec1, rotation=(0.0, 0.0, 0.0))
bpy.ops.object.editmode_toggle()
bpy.ops.mesh.extrude_region_move(MESH_OT_extrude={"type":'REGION'}, TRANSFORM_OT_translate={"value":myVec2})
#3

thanks zeffii
that works

but there is still something i don’t understand

when i create for example a cube

and run the following code
the extruded circles don’t ‘follow’ the edges


 ob = bpy.context.object
    me = ob.data
    verts = me.vertices
    for e in me.edges:
        vs = e.vertices
        start = vs[0]
        end = vs[1]
        meshVertexStart = verts[start]
        meshVertexEnd = verts[end]
        
        startco = meshVertexStart.co
        endco = meshVertexEnd.co
        
        bpy.ops.mesh.primitive_circle_add(vertices=8, radius=0.03, fill=True, view_align=False, enter_editmode=False, location=startco, rotation=(0.0, 0.0, 0.0))
        
        bpy.ops.object.editmode_toggle()
        bpy.ops.mesh.extrude_region_move(MESH_OT_extrude={"type":'REGION'}, TRANSFORM_OT_translate={"value":endco})
        bpy.ops.object.editmode_toggle()

thanks for any help
sc3*2

#4

I think you need a vector from the edge to make your extrusion… and also rotate the circle before doing that… Try this change to your code, it even worked on a monkey :wink: -there may be better ways I completly ignore, it would be nice to know some math- edit: it should work now


import bpy, mathutils
ob = bpy.context.object
me = ob.data
verts = me.vertices
for e in me.edges:
    vs = e.vertices
    start = vs[0]
    end = vs[1]
    meshVertexStart = verts[start]
    meshVertexEnd = verts[end]
    startco = meshVertexStart.co
    endco = meshVertexEnd.co
    victor = endco - startco
    r = victor.angle((0,0,1))
    a = victor.cross((0,0,1))
    bpy.ops.mesh.primitive_circle_add(vertices=8, radius=0.03, fill=True, view_align=False, enter_editmode=False, location=startco)
    bpy.ops.object.editmode_toggle()
    bpy.ops.transform.rotate(value=[r], axis=a)
    bpy.ops.mesh.extrude_region_move(MESH_OT_extrude={"type":'REGION'}, TRANSFORM_OT_translate={"value":victor})
    bpy.ops.object.editmode_toggle()
#5

thanks liero
works almost perfectly :slight_smile:

#6

but how did you find this ?

    vector = endco - startco
    v = vector.angle((0,1,1))

and what does it actually do ?

thanks
sc3sc3

#7

look like solidify edges
but it does only the top and bottom part not the edges on the sides!
and new top and bottom is disconnected !
so need to remove doulbe also i think!

is that what your trying to do ?

happy 2.5

#8

yes indeed
looks and sounds like a solidified duck :slight_smile:

#9

but why are the sides not done ?
are you going to add it ?

thanks

#10

yes doubles can be removed
and the ‘joints’ where the extruded circles meet are a little messy

but other than that i don’t really know what you are talking about
what sides ?

regards
sc3*2

#11

[ATTACH=CONFIG]141211[/ATTACH]do you see it

thanks

#12

ok
that’s because of the angle of the circle where the extrusion starts
the angle between the direction of the extrusion and the surface of that circle is not 90 °
probably not that very hard to fix
but i don’t know how to do that right now

regards

#13

Hi, I updated the code above so that it really rotates the circle before extruding… a simple way of geting similar results would be deleting faces and converting edges to curve, then adding bevel. But again, it is good to learn something new.

#14

nice :slight_smile:
thanks