KNIFE:Relative coords input by picking a vertex first and locations relative to that

Support Modeling
1

I copied this from another thread I had started.
Since that thread is pretty much solved, still wondering though about this bit

Thank you.
It’s a way I tried but failed because the knife is a “freehand tool”. I was looking for a way to snap the input points to a grid or some to angles. Ok I can point to a vertex from the profile I will be cutting, then what?
If I were to calculate all vertices for the cut, using trig, it would be a mute excercise…
Is there no way to point relative to the first point to define a plane in 3D, to use as a cut ?
Didn’t find it… but it likely exists.

In general cutting with a three point plane using a snap point and to relevant coordinates would work well, for cuts.
For example with AutoCAD that would be pointing to the first point and then
2nd point: @1,1,0 (a point 1 unit in x, 1 unit in y - would be 45degrees - and 0 in Z)
3d point: @0,01 (in the z direction)

PS : I know about SHEAR and it works excellent.
But this way of inputing relative, would be nice with the KNIFE and other commands too.

2

With the knife tool look at the 3d view header for additional option. C turns on/off the angle constraint

Or use a proxy mesh to cut from a precise vertex location to another precise vertex location

3

Thanks, that works by constraining angles and the knife can do a cut that way.
The plane is another more general but indirect method.
Still wonder if there is a way to enter points relative to another