Hi all,

  I'm trying to create an animation where an aircraft flies past a building
with a rainbow in the background.  The aircraft is a png file with a
transparent background that I am using as an image map in a box object.  It
flies in front of the building without blocking outside of the aircraft's
silhouette.  However, when  it passes in front of the rainbow, something is
causing a box-shaped area to be blocked on the rainbow.  I've tried a number
of things but since I've only been at this a week, there's a lot that I
don't know yet.  I'm supplying the code that I'm using below.  Thanks in
advance for any help.

Hugh

#include "colors.inc"
#include "stones.inc"

#declare r_violet1 = color rgbf<1.0, 0.5, 1.0, 1.0>;
#declare r_violet2 = color rgbf<1.0, 0.5, 1.0, 0.8>;
#declare r_indigo = color rgbf<0.5, 0.5, 1.0, 0.8>;
#declare r_blue = color rgbf<0.2, 0.2, 1.0, 0.8>;
#declare r_cyan = color rgbf<0.2, 1.0, 1.0, 0.8>;
#declare r_green = color rgbf<0.2, 1.0, 0.2, 0.8>;
#declare r_yellow = color rgbf<1.0, 1.0, 0.2, 0.8>;
#declare r_orange = color rgbf<1.0, 0.5, 0.2, 0.8>;
#declare r_red1 = color rgbf<1.0, 0.2, 0.2, 0.8>;
#declare r_red2 = color rgbf<1.0, 0.2, 0.2, 1.0>;


camera {
 location <10, 30, -20>
 look_at <10, 40, 0>
 // Animation setting
// location <-10, 30, -50>
// look_at <0, 25, 0>
}

light_source { <-20, 120, -20> color White }

background { rgb <.7, .7, 1> }

plane {
 y, 0
 pigment { color Green }
 finish { ambient .3 diffuse .7 }
}

// -------- Sky -------------
sky_sphere {
 pigment {
  bozo
  turbulence 0.65
  octaves 6
  omega 0.7
  lambda 2
  color_map {
   [0.0 0.1 color rgb <0.85, 0.85, 0.85>
    color rgb <0.75, 0.75, 0.75>]
   [0.1 0.5 color rgb <0.75, 0.75, 0.75>
    color rgbt <1, 1, 1, 1>]
   [0.5 1.0 color rgbt <1, 1, 1, 1>
    color rgbt <1, 1, 1, 1>]
  }
  scale <0.2, 0.5, 0.2>
 }
 rotate -150*x
 rotate -150*z
}


// Gently disappearing rainbow in the sky
rainbow {
 angle 42.5
 width 5
 arc_angle 170
 falloff_angle 30
 distance 1.0e5
 direction <-0.2, -0.2, 1>
 jitter 0.01
 color_map {
  [0.000 color r_violet1 transmit 0.25]
  [0.100 color r_violet2 transmit 0.25]
  [0.214 color r_indigo transmit 0.25]
  [0.328 color r_blue transmit 0.3]
  [0.442 color r_cyan transmit 0.25]
  [0.556 color r_green transmit 0.25]
  [0.670 color r_yellow transmit 0.25]
  [0.784 color r_orange transmit 0.2]
  [0.900 color r_red1 transmit 0.45]
 }
}

// Temporary stone box representing the building
box {
 <-8, 0, 0>, // Near lower left corner
 < 8, 40, 10> // Far upper right corner
 texture {
  T_Stone25 // Pre-defined from stones.inc
  scale 4 // Scale by the same amount in all
  // directions
 }
 rotate y*20 // Equivalent to "rotate <0,20,0>"
 translate <0, 0, 20>
}

// Aircraft containment box
box {
 <-9, -3, 0>, // Near lower left corner
 < 8, 2, 0> // Far upper right corner
 pigment {
  image_map{
   png "B2FrontClean.png"
   once
  }
  scale <16, 4, 0>
  translate <-8.35, -2.65, 0>
 }
 rotate <0, -30, 90>
 // This translation is for static viewing
 translate <10, 40, 0>
        // These are for the animation
// translate <-20, 40, 0>
// translate <10*clock, 0, 0>
}

Post a reply to this message