// Persistence of Vision Ray Tracer Scene Description File
// File: materialmapbug.pov
// Vers: 3.5
// Desc: Demonstration of bug in material maps
// Date: 6 April, 2002
// Auth: Henry Bush, henry'at'unforgettable.com

// This scene contains a box with a material map on it (80x80x16 colours)

// Two bugs actually: when this scene is rendered several times, I get (seemingly random) different colours for the 
// space outside the circle (which is palette index 15 and not specified in the map), and therefore the other two
// visible sides of the box. I've had black and yellow mostly (indices 0 and 2-15), but also red occasionally (index 1).
// But I've not got red for quite some time (traced it probs about 100 times as well, so it's not a 1/16 chance!).


// NOTE: This next bit is not a bug. Just checked the docs. The insert material_map states interpolate type 1
// can be used for linear interpolation. Can this be changed?

// (IGNORE) The other bug is that When I use linear interpolation on the material_map, I get a black (index 0) box: no image at
// all. This isn't affected by map type. I discover now that it occurs with image_maps too. Someone must have found
// this bug before, right? (/IGNORE)



// I've tested this bug with both a BMP and a PNG and the bug still occurs in each case.
// Bug has been tested on my system in 3.1g, same thing happens.

// I think I've removed all that I can, including lights. All done with ambient.


// POV 3.5 Build 15, Athlon 650 o/c to 682, 512Mb RAM, Windows XP Pro.

#version 3.5;

global_settings {
	ambient_light 6
  assumed_gamma 1.0
}

// ----------------------------------------

camera {
  location  <0.0, 1.5, -4.0>
  direction 2.5*z
  right     x*4/3 //image_width/image_height
  look_at   <0.5, 0.5,  0.5>
}

background {
	rgb .7
}


// ----------------------------------------



box {
  <0,0,0>
  <1,1,1>
texture {

material_map {
  png "Circular Window 1 Stupidly Small.png" // 
  map_type 0        // Happens with all map types
  interpolate 0     // none, bilinear and normalised work fine, but linear doesn't
  texture { pigment {colour rgb 0} }     // Black
  texture { pigment {colour rgb <1,0,0>} }  // Red
  texture { pigment {colour rgb <1,1,0>} }    // Yellow
} // material_map



}

rotate y*45	// To get a better look
}