Morphing example (morph.rvb)

   Copyright (C) 2004 Stylianos Dritsas

   This software is provided 'as-is', without any expressed or implied warranty.
   In no event will the author be held liable for any damages arising from the
   use of this software.

   Permission is granted to anyone to use this software for any purpose,
   including commercial applications, and to alter it and redistribute it
   freely, subject to the following restrictions:

   1. The origin of this software must not be misrepresented; you must not
      claim that you wrote the original software. If you use this software
      in a product, an acknowledgment in the product documentation would be
      appreciated but is not required.
   2. Altered source versions must be plainly marked as such, and must not be
      misrepresented as being the original software.
   3. This notice may not be removed or altered from any source distribution.

   Stylianos Dritsas <dritsas@alum.mit.edu>

dim u: u = 0: dim min: min = 0

dim v: v = 1: dim max: max = 1

sa = rhino.getobject( "sa" )

sb = rhino.getobject( "sb" )

dim steps: steps = 12

for i = 1 to steps - 1

   call surface_interpolate( sa, sb, 10, 10, i/steps )
next

function surface_interpolate( sa, sb, cols, rows, factor )

   dim nu: nu = cols
   dim nv: nv = rows

   dim cpa: cpa = array( nu, nv )
   dim cpb: cpb = array( nu, nv )

   dim da: da = array( rhino.surfacedomain( sa, U ), rhino.surfacedomain( sa, V ) )
   dim db: db = array( rhino.surfacedomain( sb, U ), rhino.surfacedomain( sb, V ) )

   dim dua: dua = ( da( U )( MAX ) - da( U )( MIN ) ) / ( cpa( U ) - 1 )
   dim dva: dva = ( da( V )( MAX ) - da( V )( MIN ) ) / ( cpa( V ) - 1 )
   dim ua: ua = da( U )( MIN )
   dim va: va = da( V )( MIN )

   dim dub: dub = ( db( U )( MAX ) - db( U )( MIN ) ) / ( cpb( U ) - 1 )
   dim dvb: dvb = ( db( V )( MAX ) - db( V )( MIN ) ) / ( cpb( V ) - 1 )
   dim ub: ub = db( U )( MIN )
   dim vb: vb = db( V )( MIN )

   dim point: point = 0
   redim points( nu * nv - 1 )

   dim pu, pv
   for pu = 0 to nu - 1
     for pv = 0 to nv - 1
       dim pa: pa = rhino.evaluatesurface( sa, array( pu ** dua + ua, pv ** dva + va ) )
       dim pb: pb = rhino.evaluatesurface( sb, array( pu ** dub + ub, pv ** dvb + vb ) )
       points( point ) = vertex_interpolate( pa, pb, factor )
       point = point + 1
     next
   next
   surface_interpolate = rhino.addsrfptgrid( cpa, points )
end function