ingo wrote:
> 
> While exploring the bezier patches, I can not find a way to attatch two, non
> flat, patches without a seam. To get an idea of what I'm trying run the included
> scene.
> 
> Have been looking at the output of sPatch, but I'm still clueless.
> 
> ingo
> --

In October last year Vidar Maddsen asked something similiar. I created a
small scene where I attached two patches. 
The most important thing to understand is that only the four cornerpoint
represent positions of the patch while the rest tells where the 'curve
(spline)' is heading to. In order to get a seamless connection all four
points of seam have to be the same for both patches. In the follwing
example this are the last line of the blue and the first line of the red
patch.
I hopt this one helps:


camera {
 rotate <0,180,0>
 location <7,5,3>
 look_at  <1.5,0,3>
 angle 60
}

light_source { <1.5,9,1.5> color rgb <1.0.0>}


plane {y,-4 pigment {checker rgb<1,1,1>, rgb <0.5,0.5,0.5>}}

//blue patch
bicubic_patch {
  type 1
  flatness 0.01
  u_steps 10
  v_steps 10
  <0.0, 0.0, 0.0>, <0.0, 0.5, 0.0>, <3.0, 0.5, 0.0>, <3.0, 0.0, 0.0>,
  <0.0, 0.5, 1.0>, <0.0, 3.0, 1.0>, <3.0, 3.0, 1.0>, <3.0, 0.5, 1.0>,
  <0.0, 0.5, 2.0>, <0.0, 3.0, 2.0>, <3.0, 3.0, 2.0>, <3.0, 0.5, 2.0>,
  <0.0, 0.0, 3.0>, <0.0, 0.5, 3.0>, <3.0, 0.5, 3.0>, <3.0, 0.0, 3.0>  //
<-+
  pigment {color rgb <0,0,1> } 					      //   |
  }								      //   |s
								      //   |a
                           					      //   |m
//red patch							      //   |e
bicubic_patch {							      //   |  type 1							      	      //   |l
  flatness 0.01  						      //   |i
  u_steps 10							      //   |n
  v_steps 10							      //   |e
  <0.0, 0.0, 3.0>, <0.0, 0.5, 3.0>, <3.0, 0.5, 3.0>, <3.0, 0.0, 3.0>, //
<-+
  <0.0, -0.5, 4.0>, <0.0, -2.0, 4.0>, <3.0, -2.0, 4.0>, <3.0, -0.5,
4.0>,
  <0.0, -0.5, 5.0>, <0.0, -2.0, 5.0>, <3.0, -2.0, 5.0>, <3.0, -0.5,
5.0>,
  <0.0, 0.0, 6.0>, <0.0, 0.5, 6.0>, <3.0, 0.5, 6.0>, <3.0, 0.0, 6.0>
  pigment {color rgb <1,0,0> }
  }


Marc
-- 
Marc Schimmler

Post a reply to this message