Some POV-ray scripts just give me a blank black screen whilst others run fine. Below is an example (originally written by Steve Waterman) of a scene that just gives me a blank black screen
/*
mecon
*/
#declare a = 0.5;
union {
polygon { 4,
<1, 0, -a >, < 1, -a, 0 >, < 1, 0, a >, < 1, a, 0 > }
polygon { 4,
<-1, -a, 0>, < -1, 0, a>, < -1, a, 0>, <-1, 0, -a > }
polygon { 4,
< 0, a, -1>, < -a, 0, -1>, < 0 ,-a ,-1>, < a , 0, -1> }
polygon { 4,
<-a , 0, 1>, < 0,-a ,1>, < a, 0 , 1>, < 0 , a , 1 > }
polygon { 4,
< a , 1 , 0>, < 0, 1, a>, < -a , 1 , 0 >, < 0 , 1, -a > }
polygon { 4,
<0, -1 , a >, <-a,-1 , 0>, < 0 ,-1, -a>, < a ,-1 , 0 > }
polygon { 6,
<-a, 0 , 1>, < 0, -a , 1>, < 0 ,-1 , a>, <-a, -1 , 0>, < -1, -a , 0>, < -1 , 0 , a > }
polygon { 6,
<-a , 0 , 1>, < -1 , 0 , a>, < -1 , a ,0 >, <-a , 1 , 0 >, < 0 , 1 , a >, < 0 , a , 1> }
polygon { 6,
<0 , a , 1 >, <0 , 1 , a >, < a ,1 , 0 >, < 1 , a , 0 >, < 1 , 0 , a >, < a ,0 , 1 > }
polygon { 6,
<a , 0 , 1 >, < 1 , 0 , a>, < 1 ,-a , 0>, < a, -1 ,0 >, < 0 ,-1 , a >, <0 ,-a ,1 > }
polygon { 6,
<-a , 0 ,-1>, < 0 ,-a ,-1>, < 0 ,-1 ,-a >, <-a, -1 , 0 >, <-1, -a ,0 >, <-1 ,0 ,-a > }
polygon { 6,
<-a , 0 ,-1>, < -1 ,0 ,-a>, < -1 , a , 0>, < -a , 1 , 0>, < 0 , 1,-a>, < 0 ,a,-1 > }
polygon { 6,
<0 , a ,-1>, < 0 , 1 ,-a >, < a , 1 , 0>, < 1 , a , 0>, < 1 , 0, -a >, < a , 0, -1 > }
polygon { 6,
<a ,0 ,-1 >, < 1, 0 ,-a >, < 1, -a , 0>, < a ,-1 , 0 >, < 0, -1, -a >, < 0 ,-a ,-1 > }
}
Whilst the following code works perfectly...
/* Change this at will */
#declare ROOT = 10;
/* This varies the colour ramp, should be between 0 and 1 */
#declare CUTOFF = 0.5;
#declare RADIUS2 = 2 * ROOT;
#declare RADIUS = sqrt(RADIUS2);
#declare SRADIUS = 1/sqrt(2.0);
#declare vp = 0.7*<3*(RADIUS+0.5),(RADIUS+0.5),(RADIUS+0.5)>;
camera {
location vp
up y
right -x*image_width/image_height
angle 60
sky <0,0,1>
look_at <0,0,0>
}
global_settings {
assumed_gamma 1.0
}
light_source {
<3*RADIUS,RADIUS,2*RADIUS>
color rgb <1,1,1>
}
#declare IR = int(RADIUS2+1);
#declare ix = -IR;
#while (ix <= IR)
#declare iy = -IR;
#declare R = ix*ix + iy*iy;
#while (iy <= IR)
#declare iz = -IR;
#while (iz <= IR)
#if (mod(ix+iy+iz,2) = 0)
#declare R = ix*ix + iy*iy + iz*iz;
#if (R <= RADIUS2)
#debug "o"
sphere {
<ix,iy,iz>, SRADIUS
#declare RAMP = (R-CUTOFF*RADIUS2)/(RADIUS2-CUTOFF*RADIUS2);
#if (RAMP > 1)
#declare RAMP = 1;
#end
#if (RAMP < 0)
#declare RAMP = 0;
#end
texture {
pigment { color rgb <RAMP,0,1-RAMP> }
finish { specular 0.3 }
}
}
#end
#end
#declare iz = iz + 1;
#end
#declare iy = iy + 1;
#end
#declare ix = ix + 1;
#end
I am using POV-ray 3.7 on a x64 Win & machine.
I'm new to POV-ray any hidden settings I should know about?
ADDITIONAL NOTE based on comment below:
I added a camera & light source as follows..
#declare vp = 0.7*<3*(a+0.5),(a+0.5),(a+0.5)>;
camera {
location vp
up y
right -x*image_width/image_height
angle 60
sky <0,0,1>
look_at <0,0,0>
}
light_source {
<3*a,a,2*a>
color rgb <1,1,1>
}
global_settings {
assumed_gamma 1.0
}
...but I still get a blank screen.
There are two of problems here:
Solution for Problem 1: Add a background like
to your scene (.pov file). This will render some black object against some bluish-gray background.
Solution for Problem 2: Declare your union as
and use it with
object
directive and give it some textureAnd there you are, you see an object with reddish shades against a bluish-grey background.