12-21-2012, 08:45 AM
(This post was last modified: 12-21-2012, 07:41 PM by puzzledpaul.)
Had already started this prior to discussing rod centre / null point movement ... so added here for possible use.
Strip describes a Vert | Bend Clamped (lmb) option.
0 : Shows the basic object being used prior to the op. I've done several things on purpose.
Blue areas are going to be the clamped / unbent part of the object. Note that they're different.
Orange edges have been used to show the Rod Centre (null point) edgeloop - note that this is neither in the centre of the object nor the centre of the region to be bent.
I've also used orange for the (12) axial edges along the cylinder, to (hopefully) clarify the locations used for the various stages of the op. Rod Centre and Rod Top selection points must lie on this orange line unless you want a twisted (and bent) object.
NB. Deliberately mis-aligning Rod Centre / Top points opens up a whole new world of interesting shapes / possibilities - both the RC > RTop distance and their angular misalignment play important roles in the creation of such shapes - experiment
The object is lying on the XZ plane - so it could be argued that words like 'top' and 'bottom' are irrelevant ...
![[Image: bendclampedcombo50pc.gif]](http://img.photobucket.com/albums/v492/pppix/bendclampedcombo50pc.gif)
1 : Start Vert | Clamped Bend > Plastic (lmb) ... for Rod Centre, select vert shown (where orange edges intersect)
2 : For Rod Top, select vert shown - note it's only one section away from Rod Centre. This means that the angle displayed (during dragging) in top left info will be the angle between the 2 edgeloops associated with these 2 verts.
3 : For Bend Normal, select vert shown - this particular vector passes through the centre of the finished bend - both before the op. commences and after the op. is finished. This is because it passes through the Rod Centre / Null Point.
Although other elements that produce a similar / parallel vector (eg all the other verts on the straight orange edges [except end ones]) will do the job ... the only time their vectors will pass thro' the bend centre is after bending is complete.
4 : For Top Clamp point, select vert shown - any of the verts (or edges) on that eloop will be ok. Choosing elements that aren't on the same (orange) line as Rod Centre / Top / B. Normal won't matter.
5 : For Bottom Clamp point, select vert shown. Note that the order of specifying clamp points is unimportant.
6, 6a, 7 : Various finished shapes. 6 + 7 were dragged to +15deg and -15deg ...so that's the angle between adjacent eloops. The bold blue right angled lnes in 6 and 7 show that 90 deg is 6 x 15deg segments.
The lower sequence shows that the eloop associated with the Rod Centre vert hasn't moved during the op.
The same shape could be achieved by selecting a Rod Top point anywhere along the straight orange edges (except Rod Centre) ... the only difference would be the drag angle needed (and the maths involved)
Angle displayed = Angle between adjacent segments X Number of segments (between Rod Centre and Rod Top points)
pp
oort - any chance of describing / showing a pic of the w/flow used for behaviour mentioned in #25?
Strip describes a Vert | Bend Clamped (lmb) option.
0 : Shows the basic object being used prior to the op. I've done several things on purpose.
Blue areas are going to be the clamped / unbent part of the object. Note that they're different.
Orange edges have been used to show the Rod Centre (null point) edgeloop - note that this is neither in the centre of the object nor the centre of the region to be bent.
I've also used orange for the (12) axial edges along the cylinder, to (hopefully) clarify the locations used for the various stages of the op. Rod Centre and Rod Top selection points must lie on this orange line unless you want a twisted (and bent) object.
NB. Deliberately mis-aligning Rod Centre / Top points opens up a whole new world of interesting shapes / possibilities - both the RC > RTop distance and their angular misalignment play important roles in the creation of such shapes - experiment
The object is lying on the XZ plane - so it could be argued that words like 'top' and 'bottom' are irrelevant ...
1 : Start Vert | Clamped Bend > Plastic (lmb) ... for Rod Centre, select vert shown (where orange edges intersect)
2 : For Rod Top, select vert shown - note it's only one section away from Rod Centre. This means that the angle displayed (during dragging) in top left info will be the angle between the 2 edgeloops associated with these 2 verts.
3 : For Bend Normal, select vert shown - this particular vector passes through the centre of the finished bend - both before the op. commences and after the op. is finished. This is because it passes through the Rod Centre / Null Point.
Although other elements that produce a similar / parallel vector (eg all the other verts on the straight orange edges [except end ones]) will do the job ... the only time their vectors will pass thro' the bend centre is after bending is complete.
4 : For Top Clamp point, select vert shown - any of the verts (or edges) on that eloop will be ok. Choosing elements that aren't on the same (orange) line as Rod Centre / Top / B. Normal won't matter.
5 : For Bottom Clamp point, select vert shown. Note that the order of specifying clamp points is unimportant.
6, 6a, 7 : Various finished shapes. 6 + 7 were dragged to +15deg and -15deg ...so that's the angle between adjacent eloops. The bold blue right angled lnes in 6 and 7 show that 90 deg is 6 x 15deg segments.
The lower sequence shows that the eloop associated with the Rod Centre vert hasn't moved during the op.
The same shape could be achieved by selecting a Rod Top point anywhere along the straight orange edges (except Rod Centre) ... the only difference would be the drag angle needed (and the maths involved)
Angle displayed = Angle between adjacent segments X Number of segments (between Rod Centre and Rod Top points)
pp
oort - any chance of describing / showing a pic of the w/flow used for behaviour mentioned in #25?