advanced box morph

hi, just wondering if anyone knows how to make a box morph from an already twisted box with 8 corners to another? problem is when I insert the twisted box into the "referance box component, it turns it into a rectangular bounding box surrounding my twisted box.. any way around this??

Replies to This Discussion

Permalink Reply by David Rutten on July 29, 2014 at 1:33am

Not at the moment. There is no morph logic from twisted boxes, only to twisted boxes.

Permalink Reply by kipodi on July 29, 2014 at 3:31am

nooo! I really need this.. it's for a real pavillion project being built.. have you any idea on how to solve this? I thought maybe doing a cage edit and turning the twisted box into a regular box and then doing the morph .. but rhino doesn't allow to do a cage edit from a non regular box for some reason.. any help would be apriciated..I'm in the dark about this..

Permalink Reply by David Rutten on July 29, 2014 at 4:12am

If you propose an algorithm of how to map a 3D point (xyz) into twisted box (uvw) coordinates I can make you a component that does it.

David Rutten

david@mcneel.com

Permalink Reply by kipodi on July 29, 2014 at 5:40am

the same way as box to twisted box.. problem is the surface morph and box morph turn the twisted box into a regular bounding box.. I am thinking its something in the definition of the grasshopper component that doesn't allow a tbox as an input. I guess you would know better than anyone else..

Permalink Reply by David Rutten on July 29, 2014 at 7:26am

The morph from straight box to twisted box is easy, because I can figure out 'where' in the straight box a point is currently. I can project the XYZ coordinates onto the three box axes and thus figure out the UVW coordinates of the point in box-space.

It is also straightforward to go from UVW back to XYZ either through a straight or a twisted box.

What I have problems with is how to figure the UVW of an XYZ point in twistedbox-space. There's probably a not-too-difficult solution to this, but I couldn't think of it back when I wrote the twistedbox morphing algorithms and I haven't thought about it since (until now).

David Rutten

david@mcneel.com

Permalink Reply by kipodi on July 29, 2014 at 7:37am

haha, well unsolved geometrical questions always creep back up at some point in life..

the box I want to use actually is not really twisted.. just the 8 points are aligned differently in space, not orthogonal one to the other... when straight lines connect them..the whole project pretty much depends on it :)

Permalink Reply by Danny Boyes on July 29, 2014 at 8:08am

Why not make use of the P input to the BBox component to orient your box to a specific plane.

Permalink Reply by kipodi on July 30, 2014 at 5:52am

ok,I see.. I thought about mappping all the box faces from one to the other and build a virtual grid , reparameterized from 0-1, so that all points are relative to it..

another option is using a notation matrix and inverting it.. is there a way to get the matrix out of the box morph component? because its output doesn't have it.. that might be useful.

thanx

Permalink Reply by Tibbar Looc on July 29, 2014 at 4:56am