I am trying to re-render the Munsell color cylinder scene from the 
object collection. However, the results look too drab. Compare it to this:

https://commons.wikimedia.org/wiki/File:Munsell_1929_color_solid.png

Does anyone have any tips to improve the render?




// Title: Munsell 1929 color solid v1.1
// Author: Michael Horvath, http://isometricland.net
// Created: 2009-11-10
// Updated: 2015-11-22
// This file is licensed under the terms of the CC-LGPL.


//------------------------------------------------------------------------------Includes

#version 3.7
#include "functions.inc"
#include "math.inc"
#include "CIE.inc"					// 
http://www.ignorancia.org/en/index.php?page=Lightsys


//------------------------------------------------------------------------------Scenery

global_settings
{
	assumed_gamma	1.0
	adc_bailout		0.005
	max_trace_level	50
	ambient_light	1
	radiosity
	{
		pretrace_start	0.08
		pretrace_end	0.01
		count		50
		error_bound	0.1
		recursion_limit	1
		normal		on
		brightness	0.8
		always_sample	yes
		gray_threshold	0.8
		media		on
	}
}

background {color srgb 1}

light_source
{
	<-1,+1,-1,> * 300
	color srgb	1
	parallel
}

#local Muns_cam_view = 0;
camera
{
	#local Muns_cam_distance =	20;
	#local Muns_cam_planesize =	3;
	#local Muns_cam_aspectratio =	image_width/image_height;
	orthographic
	location	-z * Muns_cam_distance
	direction	+z// * Muns_cam_distance
	right		+x * Muns_cam_planesize
	up		+y * Muns_cam_planesize/Muns_cam_aspectratio
	#switch (Muns_cam_view)
		#case (0)
			rotate		+x * asind(tand(30))
			rotate		+y * 045
//			rotate		+y * 180
		#break
		#case (1)
			rotate		+x * 090
			rotate		+y * 045
			rotate		+y * 180
		#case (2)
			rotate		+y * 045
			rotate		+y * 180
		#break
	#end
}


//------------------------------------------------------------------------------CSG 
objects

// Munsell Renotation Data, http://www.cis.rit.edu/mcsl/online/munsell.php
// h,	V,	C,	x,		y,		Y
#declare Muns_coo_table = array[956][6]
{
{002.5,	02,	02,	00.3825,	00.3785,	03.1260},
{005.0,	02,	02,	00.3757,	00.3839,	03.1260},
{007.5,	02,	02,	00.3660,	00.3858,	03.1260},
{010.0,	02,	02,	00.3556,	00.3848,	03.1260},
{012.5,	02,	02,	00.3421,	00.3803,	03.1260},
{015.0,	02,	02,	00.3309,	00.3743,	03.1260},
{017.5,	02,	02,	00.3165,	00.3650,	03.1260},
{020.0,	02,	02,	00.3069,	00.3580,	03.1260},
{022.5,	02,	02,	00.2978,	00.3507,	03.1260},
{025.0,	02,	02,	00.2918,	00.3450,	03.1260},
{027.5,	02,	02,	00.2869,	00.3400,	03.1260},
{030.0,	02,	02,	00.2820,	00.3341,	03.1260},
{032.5,	02,	02,	00.2765,	00.3271,	03.1260},
{035.0,	02,	02,	00.2697,	00.3175,	03.1260},
{037.5,	02,	02,	00.2651,	00.3098,	03.1260},
{040.0,	02,	02,	00.2606,	00.3010,	03.1260},
{042.5,	02,	02,	00.2578,	00.2940,	03.1260},
{045.0,	02,	02,	00.2559,	00.2874,	03.1260},
{047.5,	02,	02,	00.2545,	00.2799,	03.1260},
{050.0,	02,	02,	00.2558,	00.2725,	03.1260},
{052.5,	02,	02,	00.2592,	00.2675,	03.1260},
{055.0,	02,	02,	00.2638,	00.2624,	03.1260},
{057.5,	02,	02,	00.2712,	00.2582,	03.1260},
{060.0,	02,	02,	00.2803,	00.2567,	03.1260},
{062.5,	02,	02,	00.2892,	00.2583,	03.1260},
{065.0,	02,	02,	00.2984,	00.2612,	03.1260},
{067.5,	02,	02,	00.3071,	00.2647,	03.1260},
{070.0,	02,	02,	00.3161,	00.2691,	03.1260},
{072.5,	02,	02,	00.3279,	00.2754,	03.1260},
{075.0,	02,	02,	00.3383,	00.2829,	03.1260},
{077.5,	02,	02,	00.3459,	00.2892,	03.1260},
{080.0,	02,	02,	00.3532,	00.2957,	03.1260},
{082.5,	02,	02,	00.3614,	00.3033,	03.1260},
{085.0,	02,	02,	00.3692,	00.3111,	03.1260},
{087.5,	02,	02,	00.3751,	00.3181,	03.1260},
{090.0,	02,	02,	00.3811,	00.3274,	03.1260},
{092.5,	02,	02,	00.3852,	00.3365,	03.1260},
{095.0,	02,	02,	00.3880,	00.3476,	03.1260},
{097.5,	02,	02,	00.3889,	00.3590,	03.1260},
{100.0,	02,	02,	00.3872,	00.3688,	03.1260},
{032.5,	02,	04,	00.2343,	00.3378,	03.1260},
{035.0,	02,	04,	00.2234,	00.3150,	03.1260},
{037.5,	02,	04,	00.2162,	00.2981,	03.1260},
{047.5,	02,	04,	00.2063,	00.2400,	03.1260},
{050.0,	02,	04,	00.2102,	00.2313,	03.1260},
{052.5,	02,	04,	00.2175,	00.2245,	03.1260},
{055.0,	02,	04,	00.2263,	00.2192,	03.1260},
{057.5,	02,	04,	00.2420,	00.2148,	03.1260},
{060.0,	02,	04,	00.2600,	00.2162,	03.1260},
{062.5,	02,	04,	00.2758,	00.2208,	03.1260},
{065.0,	02,	04,	00.2908,	00.2261,	03.1260},
{067.5,	02,	04,	00.3048,	00.2321,	03.1260},
{070.0,	02,	04,	00.3189,	00.2390,	03.1260},
{072.5,	02,	04,	00.3382,	00.2496,	03.1260},
{075.0,	02,	04,	00.3558,	00.2597,	03.1260},
{077.5,	02,	04,	00.3702,	00.2683,	03.1260},
{080.0,	02,	04,	00.3850,	00.2778,	03.1260},
{082.5,	02,	04,	00.4021,	00.2900,	03.1260},
{085.0,	02,	04,	00.4184,	00.3032,	03.1260},
{087.5,	02,	04,	00.4335,	00.3169,	03.1260},
{052.5,	02,	06,	00.1825,	00.1857,	03.1260},
{055.0,	02,	06,	00.1942,	00.1811,	03.1260},
{057.5,	02,	06,	00.2189,	00.1790,	03.1260},
{060.0,	02,	06,	00.2440,	00.1840,	03.1260},
{062.5,	02,	06,	00.2661,	00.1921,	03.1260},
{065.0,	02,	06,	00.2850,	00.1992,	03.1260},
{067.5,	02,	06,	00.3025,	00.2058,	03.1260},
{070.0,	02,	06,	00.3207,	00.2132,	03.1260},
{072.5,	02,	06,	00.3470,	00.2259,	03.1260},
{075.0,	02,	06,	00.3708,	00.2380,	03.1260},
{077.5,	02,	06,	00.3918,	00.2490,	03.1260},
{080.0,	02,	06,	00.4139,	00.2608,	03.1260},
{082.5,	02,	06,	00.4390,	00.2760,	03.1260},
{085.0,	02,	06,	00.4642,	00.2934,	03.1260},
{080.0,	02,	08,	00.4428,	00.2419,	03.1260},
{002.5,	03,	02,	00.3703,	00.3700,	06.5550},
{005.0,	03,	02,	00.3646,	00.3748,	06.5550},
{007.5,	03,	02,	00.3589,	00.3778,	06.5550},
{010.0,	03,	02,	00.3513,	00.3789,	06.5550},
{012.5,	03,	02,	00.3412,	00.3768,	06.5550},
{015.0,	03,	02,	00.3319,	00.3729,	06.5550},
{017.5,	03,	02,	00.3180,	00.3644,	06.5550},
{020.0,	03,	02,	00.3088,	00.3578,	06.5550},
{022.5,	03,	02,	00.2999,	00.3500,	06.5550},
{025.0,	03,	02,	00.2935,	00.3439,	06.5550},
{027.5,	03,	02,	00.2890,	00.3391,	06.5550},
{030.0,	03,	02,	00.2844,	00.3337,	06.5550},
{032.5,	03,	02,	00.2799,	00.3271,	06.5550},
{035.0,	03,	02,	00.2742,	00.3192,	06.5550},
{037.5,	03,	02,	00.2699,	00.3120,	06.5550},
{040.0,	03,	02,	00.2660,	00.3050,	06.5550},
{042.5,	03,	02,	00.2636,	00.2983,	06.5550},
{045.0,	03,	02,	00.2617,	00.2921,	06.5550},
{047.5,	03,	02,	00.2616,	00.2857,	06.5550},
{050.0,	03,	02,	00.2631,	00.2801,	06.5550},
{052.5,	03,	02,	00.2663,	00.2756,	06.5550},
{055.0,	03,	02,	00.2708,	00.2719,	06.5550},
{057.5,	03,	02,	00.2777,	00.2687,	06.5550},
{060.0,	03,	02,	00.2847,	00.2670,	06.5550},
{062.5,	03,	02,	00.2922,	00.2680,	06.5550},
{065.0,	03,	02,	00.2997,	00.2700,	06.5550},
{067.5,	03,	02,	00.3088,	00.2740,	06.5550},
{070.0,	03,	02,	00.3170,	00.2790,	06.5550},
{072.5,	03,	02,	00.3272,	00.2861,	06.5550},
{075.0,	03,	02,	00.3370,	00.2940,	06.5550},
{077.5,	03,	02,	00.3450,	00.3001,	06.5550},
{080.0,	03,	02,	00.3526,	00.3068,	06.5550},
{082.5,	03,	02,	00.3591,	00.3130,	06.5550},
{085.0,	03,	02,	00.3645,	00.3190,	06.5550},
{087.5,	03,	02,	00.3690,	00.3248,	06.5550},
{090.0,	03,	02,	00.3728,	00.3314,	06.5550},
{092.5,	03,	02,	00.3757,	00.3391,	06.5550},
{095.0,	03,	02,	00.3771,	00.3476,	06.5550},
{097.5,	03,	02,	00.3771,	00.3549,	06.5550},
{100.0,	03,	02,	00.3747,	00.3630,	06.5550},
{002.5,	03,	04,	00.4277,	00.4166,	06.5550},
{012.5,	03,	04,	00.3772,	00.4484,	06.5550},
{015.0,	03,	04,	00.3554,	00.4429,	06.5550},
{017.5,	03,	04,	00.3270,	00.4288,	06.5550},
{020.0,	03,	04,	00.3053,	00.4123,	06.5550},
{022.5,	03,	04,	00.2836,	00.3915,	06.5550},
{025.0,	03,	04,	00.2711,	00.3780,	06.5550},
{027.5,	03,	04,	00.2618,	00.3667,	06.5550},
{030.0,	03,	04,	00.2525,	00.3537,	06.5550},
{032.5,	03,	04,	00.2437,	00.3386,	06.5550},
{035.0,	03,	04,	00.2343,	00.3200,	06.5550},
{037.5,	03,	04,	00.2272,	00.3041,	06.5550},
{040.0,	03,	04,	00.2221,	00.2886,	06.5550},
{042.5,	03,	04,	00.2183,	00.2748,	06.5550},
{045.0,	03,	04,	00.2176,	00.2632,	06.5550},
{047.5,	03,	04,	00.2200,	00.2536,	06.5550},
{050.0,	03,	04,	00.2246,	00.2467,	06.5550},
{052.5,	03,	04,	00.2312,	00.2405,	06.5550},
{055.0,	03,	04,	00.2393,	00.2361,	06.5550},
{057.5,	03,	04,	00.2520,	00.2319,	06.5550},
{060.0,	03,	04,	00.2660,	00.2319,	06.5550},
{062.5,	03,	04,	00.2792,	00.2342,	06.5550},
{065.0,	03,	04,	00.2928,	00.2386,	06.5550},
{067.5,	03,	04,	00.3072,	00.2448,	06.5550},
{070.0,	03,	04,	00.3214,	00.2517,	06.5550},
{072.5,	03,	04,	00.3400,	00.2624,	06.5550},
{075.0,	03,	04,	00.3586,	00.2742,	06.5550},
{077.5,	03,	04,	00.3739,	00.2851,	06.5550},
{080.0,	03,	04,	00.3889,	00.2969,	06.5550},
{082.5,	03,	04,	00.4021,	00.3076,	06.5550},
{085.0,	03,	04,	00.4148,	00.3190,	06.5550},
{087.5,	03,	04,	00.4240,	00.3302,	06.5550},
{090.0,	03,	04,	00.4308,	00.3412,	06.5550},
{092.5,	03,	04,	00.4360,	00.3563,	06.5550},
{095.0,	03,	04,	00.4376,	00.3715,	06.5550},
{097.5,	03,	04,	00.4378,	00.3865,	06.5550},
{100.0,	03,	04,	00.4341,	00.4018,	06.5550},
{032.5,	03,	06,	00.2132,	00.3468,	06.5550},
{035.0,	03,	06,	00.2020,	00.3188,	06.5550},
{037.5,	03,	06,	00.1928,	00.2958,	06.5550},
{040.0,	03,	06,	00.1861,	00.2722,	06.5550},
{042.5,	03,	06,	00.1826,	00.2536,	06.5550},
{045.0,	03,	06,	00.1835,	00.2375,	06.5550},
{047.5,	03,	06,	00.1875,	00.2258,	06.5550},
{050.0,	03,	06,	00.1933,	00.2173,	06.5550},
{052.5,	03,	06,	00.2022,	00.2101,	06.5550},
{055.0,	03,	06,	00.2122,	00.2052,	06.5550},
{057.5,	03,	06,	00.2311,	00.2010,	06.5550},
{060.0,	03,	06,	00.2511,	00.2031,	06.5550},
{062.5,	03,	06,	00.2691,	00.2072,	06.5550},
{065.0,	03,	06,	00.2870,	00.2135,	06.5550},
{067.5,	03,	06,	00.3057,	00.2208,	06.5550},
{070.0,	03,	06,	00.3243,	00.2293,	06.5550},
{072.5,	03,	06,	00.3501,	00.2425,	06.5550},
{075.0,	03,	06,	00.3765,	00.2569,	06.5550},
{077.5,	03,	06,	00.3990,	00.2708,	06.5550},
{080.0,	03,	06,	00.4218,	00.2864,	06.5550},
{082.5,	03,	06,	00.4409,	00.3009,	06.5550},
{085.0,	03,	06,	00.4592,	00.3168,	06.5550},
{087.5,	03,	06,	00.4738,	00.3316,	06.5550},
{090.0,	03,	06,	00.4854,	00.3467,	06.5550},
{092.5,	03,	06,	00.4954,	00.3692,	06.5550},
{047.5,	03,	08,	00.1583,	00.1987,	06.5550},
{050.0,	03,	08,	00.1658,	00.1905,	06.5550},
{052.5,	03,	08,	00.1780,	00.1833,	06.5550},
{055.0,	03,	08,	00.1908,	00.1799,	06.5550},
{057.5,	03,	08,	00.2149,	00.1761,	06.5550},
{060.0,	03,	08,	00.2387,	00.1786,	06.5550},
{062.5,	03,	08,	00.2615,	00.1845,	06.5550},
{065.0,	03,	08,	00.2819,	00.1910,	06.5550},
{067.5,	03,	08,	00.3037,	00.1981,	06.5550},
{070.0,	03,	08,	00.3269,	00.2075,	06.5550},
{072.5,	03,	08,	00.3598,	00.2233,	06.5550},
{075.0,	03,	08,	00.3930,	00.2395,	06.5550},
{077.5,	03,	08,	00.4234,	00.2556,	06.5550},
{080.0,	03,	08,	00.4552,	00.2741,	06.5550},
{082.5,	03,	08,	00.4821,	00.2918,	06.5550},
{085.0,	03,	08,	00.5064,	00.3114,	06.5550},
{087.5,	03,	08,	00.5251,	00.3297,	06.5550},
{052.5,	03,	10,	00.1576,	00.1600,	06.5550},
{055.0,	03,	10,	00.1718,	00.1562,	06.5550},
{057.5,	03,	10,	00.2005,	00.1536,	06.5550},
{060.0,	03,	10,	00.2278,	00.1565,	06.5550},
{062.5,	03,	10,	00.2548,	00.1638,	06.5550},
{065.0,	03,	10,	00.2772,	00.1707,	06.5550},
{067.5,	03,	10,	00.3020,	00.1794,	06.5550},
{070.0,	03,	10,	00.3286,	00.1889,	06.5550},
{072.5,	03,	10,	00.3681,	00.2054,	06.5550},
{075.0,	03,	10,	00.4073,	00.2235,	06.5550},
{077.5,	03,	10,	00.4445,	00.2419,	06.5550},
{080.0,	03,	10,	00.4851,	00.2618,	06.5550},
{082.5,	03,	10,	00.5191,	00.2811,	06.5550},
{085.0,	03,	10,	00.5500,	00.3024,	06.5550},
{055.0,	03,	12,	00.1557,	00.1356,	06.5550},
{002.5,	04,	02,	00.3633,	00.3654,	12.0000},
{005.0,	04,	02,	00.3590,	00.3701,	12.0000},
{007.5,	04,	02,	00.3542,	00.3727,	12.0000},
{010.0,	04,	02,	00.3436,	00.3732,	12.0000},
{012.5,	04,	02,	00.3382,	00.3706,	12.0000},
{015.0,	04,	02,	00.3312,	00.3678,	12.0000},
{017.5,	04,	02,	00.3185,	00.3604,	12.0000},
{020.0,	04,	02,	00.3109,	00.3550,	12.0000},
{022.5,	04,	02,	00.3012,	00.3470,	12.0000},
{025.0,	04,	02,	00.2959,	00.3417,	12.0000},
{027.5,	04,	02,	00.2919,	00.3371,	12.0000},
{030.0,	04,	02,	00.2880,	00.3327,	12.0000},
{032.5,	04,	02,	00.2840,	00.3270,	12.0000},
{035.0,	04,	02,	00.2799,	00.3208,	12.0000},
{037.5,	04,	02,	00.2764,	00.3148,	12.0000},
{040.0,	04,	02,	00.2740,	00.3091,	12.0000},
{042.5,	04,	02,	00.2727,	00.3038,	12.0000},
{045.0,	04,	02,	00.2723,	00.2992,	12.0000},
{047.5,	04,	02,	00.2733,	00.2947,	12.0000},
{050.0,	04,	02,	00.2753,	00.2910,	12.0000},
{052.5,	04,	02,	00.2782,	00.2876,	12.0000},
{055.0,	04,	02,	00.2816,	00.2842,	12.0000},
{057.5,	04,	02,	00.2861,	00.2819,	12.0000},
{060.0,	04,	02,	00.2911,	00.2804,	12.0000},
{062.5,	04,	02,	00.2962,	00.2807,	12.0000},
{065.0,	04,	02,	00.3022,	00.2825,	12.0000},
{067.5,	04,	02,	00.3093,	00.2859,	12.0000},
{070.0,	04,	02,	00.3162,	00.2902,	12.0000},
{072.5,	04,	02,	00.3231,	00.2951,	12.0000},
{075.0,	04,	02,	00.3310,	00.3010,	12.0000},
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{045.0,	07,	04,	00.2633,	00.2972,	43.0600},
{047.5,	07,	04,	00.2651,	00.2927,	43.0600},
{050.0,	07,	04,	00.2685,	00.2886,	43.0600},
{052.5,	07,	04,	00.2729,	00.2848,	43.0600},
{055.0,	07,	04,	00.2773,	00.2828,	43.0600},
{057.5,	07,	04,	00.2833,	00.2809,	43.0600},
{060.0,	07,	04,	00.2886,	00.2801,	43.0600},
{062.5,	07,	04,	00.2950,	00.2810,	43.0600},
{065.0,	07,	04,	00.3009,	00.2831,	43.0600},
{067.5,	07,	04,	00.3111,	00.2880,	43.0600},
{070.0,	07,	04,	00.3181,	00.2920,	43.0600},
{072.5,	07,	04,	00.3254,	00.2971,	43.0600},
{075.0,	07,	04,	00.3332,	00.3032,	43.0600},
{077.5,	07,	04,	00.3389,	00.3079,	43.0600},
{080.0,	07,	04,	00.3446,	00.3125,	43.0600},
{082.5,	07,	04,	00.3499,	00.3171,	43.0600},
{085.0,	07,	04,	00.3552,	00.3222,	43.0600},
{087.5,	07,	04,	00.3611,	00.3282,	43.0600},
{090.0,	07,	04,	00.3671,	00.3360,	43.0600},
{092.5,	07,	04,	00.3715,	00.3439,	43.0600},
{095.0,	07,	04,	00.3750,	00.3530,	43.0600},
{097.5,	07,	04,	00.3772,	00.3613,	43.0600},
{100.0,	07,	04,	00.3778,	00.3719,	43.0600},
{002.5,	07,	06,	00.4073,	00.4073,	43.0600},
{005.0,	07,	06,	00.4009,	00.4198,	43.0600},
{007.5,	07,	06,	00.3943,	00.4264,	43.0600},
{010.0,	07,	06,	00.3864,	00.4305,	43.0600},
{012.5,	07,	06,	00.3728,	00.4316,	43.0600},
{015.0,	07,	06,	00.3581,	00.4291,	43.0600},
{017.5,	07,	06,	00.3341,	00.4191,	43.0600},
{020.0,	07,	06,	00.3142,	00.4058,	43.0600},
{022.5,	07,	06,	00.2933,	00.3873,	43.0600},
{025.0,	07,	06,	00.2801,	00.3721,	43.0600},
{027.5,	07,	06,	00.2728,	00.3622,	43.0600},
{042.5,	07,	06,	00.2418,	00.2960,	43.0600},
{045.0,	07,	06,	00.2410,	00.2854,	43.0600},
{047.5,	07,	06,	00.2436,	00.2787,	43.0600},
{050.0,	07,	06,	00.2478,	00.2728,	43.0600},
{052.5,	07,	06,	00.2538,	00.2677,	43.0600},
{055.0,	07,	06,	00.2596,	00.2643,	43.0600},
{057.5,	07,	06,	00.2687,	00.2612,	43.0600},
{060.0,	07,	06,	00.2776,	00.2612,	43.0600},
{062.5,	07,	06,	00.2873,	00.2633,	43.0600},
{065.0,	07,	06,	00.2961,	00.2663,	43.0600},
{067.5,	07,	06,	00.3111,	00.2730,	43.0600},
{070.0,	07,	06,	00.3221,	00.2786,	43.0600},
{072.5,	07,	06,	00.3338,	00.2854,	43.0600},
{075.0,	07,	06,	00.3470,	00.2949,	43.0600},
{077.5,	07,	06,	00.3562,	00.3022,	43.0600},
{080.0,	07,	06,	00.3648,	00.3098,	43.0600},
{082.5,	07,	06,	00.3728,	00.3170,	43.0600},
{085.0,	07,	06,	00.3805,	00.3244,	43.0600},
{087.5,	07,	06,	00.3888,	00.3336,	43.0600},
{090.0,	07,	06,	00.3984,	00.3452,	43.0600},
{092.5,	07,	06,	00.4053,	00.3570,	43.0600},
{095.0,	07,	06,	00.4091,	00.3701,	43.0600},
{097.5,	07,	06,	00.4107,	00.3820,	43.0600},
{100.0,	07,	06,	00.4102,	00.3960,	43.0600},
{002.5,	07,	08,	00.4353,	00.4312,	43.0600},
{005.0,	07,	08,	00.4271,	00.4462,	43.0600},
{007.5,	07,	08,	00.4184,	00.4568,	43.0600},
{010.0,	07,	08,	00.4090,	00.4641,	43.0600},
{012.5,	07,	08,	00.3919,	00.4684,	43.0600},
{015.0,	07,	08,	00.3722,	00.4669,	43.0600},
{017.5,	07,	08,	00.3406,	00.4558,	43.0600},
{020.0,	07,	08,	00.3140,	00.4387,	43.0600},
{022.5,	07,	08,	00.2861,	00.4129,	43.0600},
{067.5,	07,	08,	00.3109,	00.2584,	43.0600},
{070.0,	07,	08,	00.3256,	00.2654,	43.0600},
{072.5,	07,	08,	00.3417,	00.2745,	43.0600},
{075.0,	07,	08,	00.3603,	00.2869,	43.0600},
{077.5,	07,	08,	00.3722,	00.2963,	43.0600},
{080.0,	07,	08,	00.3851,	00.3067,	43.0600},
{082.5,	07,	08,	00.3961,	00.3160,	43.0600},
{085.0,	07,	08,	00.4067,	00.3256,	43.0600},
{087.5,	07,	08,	00.4196,	00.3382,	43.0600},
{090.0,	07,	08,	00.4308,	00.3533,	43.0600},
{092.5,	07,	08,	00.4371,	00.3679,	43.0600},
{095.0,	07,	08,	00.4402,	00.3842,	43.0600},
{097.5,	07,	08,	00.4415,	00.3996,	43.0600},
{100.0,	07,	08,	00.4399,	00.4164,	43.0600},
{002.5,	07,	10,	00.4606,	00.4516,	43.0600},
{005.0,	07,	10,	00.4509,	00.4696,	43.0600},
{007.5,	07,	10,	00.4400,	00.4830,	43.0600},
{012.5,	07,	10,	00.4091,	00.5030,	43.0600},
{015.0,	07,	10,	00.3852,	00.5051,	43.0600},
{017.5,	07,	10,	00.3461,	00.4950,	43.0600},
{090.0,	07,	10,	00.4600,	00.3596,	43.0600},
{092.5,	07,	10,	00.4671,	00.3768,	43.0600},
{095.0,	07,	10,	00.4711,	00.3972,	43.0600},
{097.5,	07,	10,	00.4704,	00.4151,	43.0600},
{100.0,	07,	10,	00.4667,	00.4335,	43.0600},
{002.5,	08,	02,	00.3406,	00.3484,	59.1000},
{005.0,	08,	02,	00.3394,	00.3518,	59.1000},
{007.5,	08,	02,	00.3379,	00.3540,	59.1000},
{010.0,	08,	02,	00.3359,	00.3552,	59.1000},
{012.5,	08,	02,	00.3327,	00.3555,	59.1000},
{015.0,	08,	02,	00.3284,	00.3542,	59.1000},
{017.5,	08,	02,	00.3194,	00.3502,	59.1000},
{020.0,	08,	02,	00.3121,	00.3459,	59.1000},
{022.5,	08,	02,	00.3053,	00.3404,	59.1000},
{025.0,	08,	02,	00.3009,	00.3359,	59.1000},
{027.5,	08,	02,	00.2981,	00.3326,	59.1000},
{030.0,	08,	02,	00.2957,	00.3293,	59.1000},
{032.5,	08,	02,	00.2940,	00.3268,	59.1000},
{035.0,	08,	02,	00.2919,	00.3228,	59.1000},
{037.5,	08,	02,	00.2900,	00.3183,	59.1000},
{040.0,	08,	02,	00.2894,	00.3152,	59.1000},
{042.5,	08,	02,	00.2897,	00.3124,	59.1000},
{045.0,	08,	02,	00.2908,	00.3096,	59.1000},
{047.5,	08,	02,	00.2922,	00.3077,	59.1000},
{050.0,	08,	02,	00.2935,	00.3062,	59.1000},
{052.5,	08,	02,	00.2957,	00.3047,	59.1000},
{055.0,	08,	02,	00.2974,	00.3039,	59.1000},
{057.5,	08,	02,	00.3003,	00.3034,	59.1000},
{060.0,	08,	02,	00.3027,	00.3035,	59.1000},
{062.5,	08,	02,	00.3048,	00.3040,	59.1000},
{065.0,	08,	02,	00.3065,	00.3047,	59.1000},
{067.5,	08,	02,	00.3107,	00.3070,	59.1000},
{070.0,	08,	02,	00.3131,	00.3084,	59.1000},
{072.5,	08,	02,	00.3154,	00.3100,	59.1000},
{075.0,	08,	02,	00.3180,	00.3120,	59.1000},
{077.5,	08,	02,	00.3200,	00.3136,	59.1000},
{080.0,	08,	02,	00.3218,	00.3152,	59.1000},
{082.5,	08,	02,	00.3236,	00.3169,	59.1000},
{085.0,	08,	02,	00.3254,	00.3186,	59.1000},
{087.5,	08,	02,	00.3277,	00.3211,	59.1000},
{090.0,	08,	02,	00.3301,	00.3237,	59.1000},
{092.5,	08,	02,	00.3334,	00.3276,	59.1000},
{095.0,	08,	02,	00.3373,	00.3330,	59.1000},
{097.5,	08,	02,	00.3395,	00.3379,	59.1000},
{100.0,	08,	02,	00.3407,	00.3434,	59.1000},
{002.5,	08,	04,	00.3684,	00.3751,	59.1000},
{005.0,	08,	04,	00.3650,	00.3826,	59.1000},
{007.5,	08,	04,	00.3622,	00.3861,	59.1000},
{010.0,	08,	04,	00.3581,	00.3883,	59.1000},
{012.5,	08,	04,	00.3504,	00.3887,	59.1000},
{015.0,	08,	04,	00.3433,	00.3872,	59.1000},
{017.5,	08,	04,	00.3266,	00.3809,	59.1000},
{020.0,	08,	04,	00.3140,	00.3727,	59.1000},
{022.5,	08,	04,	00.3009,	00.3614,	59.1000},
{025.0,	08,	04,	00.2924,	00.3523,	59.1000},
{027.5,	08,	04,	00.2874,	00.3464,	59.1000},
{042.5,	08,	04,	00.2668,	00.3067,	59.1000},
{045.0,	08,	04,	00.2671,	00.2998,	59.1000},
{047.5,	08,	04,	00.2688,	00.2956,	59.1000},
{050.0,	08,	04,	00.2718,	00.2911,	59.1000},
{052.5,	08,	04,	00.2758,	00.2879,	59.1000},
{062.5,	08,	04,	00.2962,	00.2850,	59.1000},
{065.0,	08,	04,	00.3012,	00.2868,	59.1000},
{067.5,	08,	04,	00.3114,	00.2915,	59.1000},
{070.0,	08,	04,	00.3175,	00.2955,	59.1000},
{072.5,	08,	04,	00.3239,	00.3000,	59.1000},
{075.0,	08,	04,	00.3308,	00.3052,	59.1000},
{077.5,	08,	04,	00.3360,	00.3092,	59.1000},
{080.0,	08,	04,	00.3412,	00.3135,	59.1000},
{082.5,	08,	04,	00.3460,	00.3177,	59.1000},
{085.0,	08,	04,	00.3510,	00.3224,	59.1000},
{087.5,	08,	04,	00.3564,	00.3279,	59.1000},
{090.0,	08,	04,	00.3621,	00.3349,	59.1000},
{092.5,	08,	04,	00.3667,	00.3429,	59.1000},
{095.0,	08,	04,	00.3690,	00.3510,	59.1000},
{097.5,	08,	04,	00.3699,	00.3586,	59.1000},
{100.0,	08,	04,	00.3701,	00.3674,	59.1000},
{002.5,	08,	06,	00.3969,	00.4009,	59.1000},
{005.0,	08,	06,	00.3913,	00.4117,	59.1000},
{007.5,	08,	06,	00.3862,	00.4175,	59.1000},
{010.0,	08,	06,	00.3803,	00.4216,	59.1000},
{012.5,	08,	06,	00.3690,	00.4230,	59.1000},
{015.0,	08,	06,	00.3573,	00.4214,	59.1000},
{017.5,	08,	06,	00.3339,	00.4129,	59.1000},
{020.0,	08,	06,	00.3150,	00.4014,	59.1000},
{022.5,	08,	06,	00.2952,	00.3851,	59.1000},
{025.0,	08,	06,	00.2822,	00.3702,	59.1000},
{072.5,	08,	06,	00.3327,	00.2898,	59.1000},
{075.0,	08,	06,	00.3440,	00.2978,	59.1000},
{077.5,	08,	06,	00.3521,	00.3042,	59.1000},
{080.0,	08,	06,	00.3600,	00.3112,	59.1000},
{082.5,	08,	06,	00.3671,	00.3175,	59.1000},
{097.5,	08,	06,	00.4000,	00.3770,	59.1000},
{100.0,	08,	06,	00.3994,	00.3896,	59.1000},
{002.5,	08,	08,	00.4231,	00.4231,	59.1000},
{005.0,	08,	08,	00.4158,	00.4378,	59.1000},
{007.5,	08,	08,	00.4088,	00.4466,	59.1000},
{010.0,	08,	08,	00.4008,	00.4520,	59.1000},
{012.5,	08,	08,	00.3858,	00.4550,	59.1000},
{015.0,	08,	08,	00.3696,	00.4542,	59.1000},
{017.5,	08,	08,	00.3408,	00.4452,	59.1000},
{005.0,	08,	10,	00.4376,	00.4601,	59.1000},
{007.5,	08,	10,	00.4283,	00.4712,	59.1000},
{005.0,	08,	12,	00.4562,	00.4788,	59.1000}
}

#local Muns_gap_width = 1/16;
#local Muns_gap_vector = y * Muns_gap_width;
#local Muns_coo_count = 0;
#while (Muns_coo_count < 956)
	#local Muns_param_h = Muns_coo_table[Muns_coo_count][0];
	#local Muns_param_V = Muns_coo_table[Muns_coo_count][1];
	#local Muns_param_C = Muns_coo_table[Muns_coo_count][2];
	#local Muns_param_x = Muns_coo_table[Muns_coo_count][3];
	#local Muns_param_y = Muns_coo_table[Muns_coo_count][4];
	#local Muns_param_Y = Muns_coo_table[Muns_coo_count][5]/100;
	#local Muns_coo_xyY = <Muns_param_x,Muns_param_y,Muns_param_Y,>;
	#local Muns_coo_RGB = 
MapGamut(xyz2RGB(ChromaMatchSource(xyY2xyz(Muns_coo_xyY))));
	#local Muns_bound_object = cylinder {0,+y,Muns_param_C + 1};
	intersection
	{
		plane {+x,-Muns_gap_width}
		plane {-x,-Muns_gap_width rotate -y * 9}
		difference
		{
			cylinder {Muns_gap_vector,+y - Muns_gap_vector,Muns_param_C - 
Muns_gap_width + 1}
			cylinder {0,+y,Muns_param_C + Muns_gap_width}
			bounded_by {Muns_bound_object}
		}
		bounded_by {Muns_bound_object}
		pigment {color srgb Muns_coo_RGB}
		finish {ambient 1}
		translate	+y * (Muns_param_V - 5)
		rotate		+y * Muns_param_h/100 * 360
		scale		1/10
	}
//	#debug concat("#",str(Muns_coo_count,3,0)," = 
<",vstr(3,Muns_coo_RGB,",",0,-1),">\n");
	#local Muns_coo_count = Muns_coo_count + 1;
#end

Post a reply to this message

Le 15-11-22 14:55, Mike Horvath a écrit :
> I am trying to re-render the Munsell color cylinder scene from the
> object collection. However, the results look too drab. Compare it to this:
>
> https://commons.wikimedia.org/wiki/File:Munsell_1929_color_solid.png
>
> Does anyone have any tips to improve the render?
>
>
>
>
> // Title: Munsell 1929 color solid v1.1
> // Author: Michael Horvath, http://isometricland.net
> // Created: 2009-11-10
> // Updated: 2015-11-22
> // This file is licensed under the terms of the CC-LGPL.
> ...
> #while (Muns_coo_count < 956)
>      #local Muns_param_h = Muns_coo_table[Muns_coo_count][0];
>      #local Muns_param_V = Muns_coo_table[Muns_coo_count][1];
>      #local Muns_param_C = Muns_coo_table[Muns_coo_count][2];
>      #local Muns_param_x = Muns_coo_table[Muns_coo_count][3];
>      #local Muns_param_y = Muns_coo_table[Muns_coo_count][4];
>      #local Muns_param_Y = Muns_coo_table[Muns_coo_count][5]/100;
>      #local Muns_coo_xyY = <Muns_param_x,Muns_param_y,Muns_param_Y,>;
>      #local Muns_coo_RGB =
> MapGamut(xyz2RGB(ChromaMatchSource(xyY2xyz(Muns_coo_xyY))));
>      #local Muns_bound_object = cylinder {0,+y,Muns_param_C + 1};
>      intersection
>      {
>          plane {+x,-Muns_gap_width}
>          plane {-x,-Muns_gap_width rotate -y * 9}
>          difference
>          {
>              cylinder {Muns_gap_vector,+y - Muns_gap_vector,Muns_param_C
> - Muns_gap_width + 1}
>              cylinder {0,+y,Muns_param_C + Muns_gap_width}
>              bounded_by {Muns_bound_object}
>          }
>          bounded_by {Muns_bound_object}
>          pigment {color srgb Muns_coo_RGB}
>          finish {ambient 1}
>          translate    +y * (Muns_param_V - 5)
>          rotate        +y * Muns_param_h/100 * 360
>          scale        1/10
>      }
> //    #debug concat("#",str(Muns_coo_count,3,0)," =
> <",vstr(3,Muns_coo_RGB,",",0,-1),">\n");
>      #local Muns_coo_count = Muns_coo_count + 1;
> #end

You may try to use rgb instead of srgb.
If the original render used assumed_gamma 1 and uncorrected rgb values, 
then, using srgb would give incorrect results.


Alain

Post a reply to this message

On 11/22/2015 4:22 PM, Alain wrote:
 > Le 15-11-22 14:55, Mike Horvath a écrit :
 >> I am trying to re-render the Munsell color cylinder scene from the
 >> object collection. However, the results look too drab. Compare it to
 >> this:
 >>
 >> https://commons.wikimedia.org/wiki/File:Munsell_1929_color_solid.png
 >>
 >> Does anyone have any tips to improve the render?
 >>
 >>
 >>
 >>
 >> // Title: Munsell 1929 color solid v1.1
 >> // Author: Michael Horvath, http://isometricland.net
 >> // Created: 2009-11-10
 >> // Updated: 2015-11-22
 >> // This file is licensed under the terms of the CC-LGPL.
 >> ...
 >> #while (Muns_coo_count < 956)
 >>      #local Muns_param_h = Muns_coo_table[Muns_coo_count][0];
 >>      #local Muns_param_V = Muns_coo_table[Muns_coo_count][1];
 >>      #local Muns_param_C = Muns_coo_table[Muns_coo_count][2];
 >>      #local Muns_param_x = Muns_coo_table[Muns_coo_count][3];
 >>      #local Muns_param_y = Muns_coo_table[Muns_coo_count][4];
 >>      #local Muns_param_Y = Muns_coo_table[Muns_coo_count][5]/100;
 >>      #local Muns_coo_xyY = <Muns_param_x,Muns_param_y,Muns_param_Y,>;
 >>      #local Muns_coo_RGB =
 >> MapGamut(xyz2RGB(ChromaMatchSource(xyY2xyz(Muns_coo_xyY))));
 >>      #local Muns_bound_object = cylinder {0,+y,Muns_param_C + 1};
 >>      intersection
 >>      {
 >>          plane {+x,-Muns_gap_width}
 >>          plane {-x,-Muns_gap_width rotate -y * 9}
 >>          difference
 >>          {
 >>              cylinder {Muns_gap_vector,+y - Muns_gap_vector,Muns_param_C
 >> - Muns_gap_width + 1}
 >>              cylinder {0,+y,Muns_param_C + Muns_gap_width}
 >>              bounded_by {Muns_bound_object}
 >>          }
 >>          bounded_by {Muns_bound_object}
 >>          pigment {color srgb Muns_coo_RGB}
 >>          finish {ambient 1}
 >>          translate    +y * (Muns_param_V - 5)
 >>          rotate        +y * Muns_param_h/100 * 360
 >>          scale        1/10
 >>      }
 >> //    #debug concat("#",str(Muns_coo_count,3,0)," =
 >> <",vstr(3,Muns_coo_RGB,",",0,-1),">\n");
 >>      #local Muns_coo_count = Muns_coo_count + 1;
 >> #end
 >
 > You may try to use rgb instead of srgb.
 > If the original render used assumed_gamma 1 and uncorrected rgb values,
 > then, using srgb would give incorrect results.
 >
 >
 > Alain


Well, the colors are supposed to be exact values using Lightsys. I want 
to get them physically correct.


Mike

Post a reply to this message

>  >>      #local Muns_coo_RGB =
>  >> MapGamut(xyz2RGB(ChromaMatchSource(xyY2xyz(Muns_coo_xyY))));

>  >>          pigment {color srgb Muns_coo_RGB}
>  >>          finish {ambient 1}


>  > You may try to use rgb instead of srgb.
>  > If the original render used assumed_gamma 1 and uncorrected rgb values,
>  > then, using srgb would give incorrect results.

> Well, the colors are supposed to be exact values using Lightsys. I want
> to get them physically correct.

If MapGamut returns linear RGB values (it looks like it does, I couldn't 
see anything that indicated it does a rgb->srgb conversion) then you 
must use the rgb keyword in POV as Alain suggested.

The srgb keyword is used to supply colours in srgb space, and POV will 
then "undo" the srgb gamma correction before using the values 
internally, which is not what you want in this case. Using rgb will 
force POV to use the values you supply directly.

Post a reply to this message

Mike Horvath <mik### [at] gmailcom> wrote:
> On 11/22/2015 4:22 PM, Alain wrote:
>  > You may try to use rgb instead of srgb.
>  > If the original render used assumed_gamma 1 and uncorrected rgb values,
>  > then, using srgb would give incorrect results.
>
>
> Well, the colors are supposed to be exact values using Lightsys. I want
> to get them physically correct.

Alain is correct.  CIE.inc was written years before the srgb keyword was
introduced to the POV-Ray 3.7 betas, and was designed for proper use without it,
using assumed_gamma 1.0.  You already use assumed_gamma 1.0 in this draft, as
well as in v1.0 of this module (although the included illustration is washed out
for some reason unknown to me).  The srgb keyword was intended for color values
from outside sources.  By using it on CIE.inc-generated values, you're just
messing up what was already physically correct.

On 2009 November 10, you posted scene file munsell_color_solid_cie.pov to
p.b.s-f.  That scene renders what I expect are the correct color intensities,
notwithstanding the unrealistically high ambient value.

Post a reply to this message

On 11/23/2015 4:42 AM, scott wrote:
> If MapGamut returns linear RGB values (it looks like it does, I couldn't
> see anything that indicated it does a rgb->srgb conversion) then you
> must use the rgb keyword in POV as Alain suggested.
>
> The srgb keyword is used to supply colours in srgb space, and POV will
> then "undo" the srgb gamma correction before using the values
> internally, which is not what you want in this case. Using rgb will
> force POV to use the values you supply directly.
>

This lightened them up a little, but they are still too desaturated.


Mike

Post a reply to this message

On 11/23/2015 4:42 AM, scott wrote:
> If MapGamut returns linear RGB values (it looks like it does, I couldn't
> see anything that indicated it does a rgb->srgb conversion) then you
> must use the rgb keyword in POV as Alain suggested.
>
> The srgb keyword is used to supply colours in srgb space, and POV will
> then "undo" the srgb gamma correction before using the values
> internally, which is not what you want in this case. Using rgb will
> force POV to use the values you supply directly.
>

Also, does this mean that Lightsys is out of date?


Mike

Post a reply to this message

>> If MapGamut returns linear RGB values (it looks like it does, I couldn't
>> see anything that indicated it does a rgb->srgb conversion) then you
>> must use the rgb keyword in POV as Alain suggested.
>>
>> The srgb keyword is used to supply colours in srgb space, and POV will
>> then "undo" the srgb gamma correction before using the values
>> internally, which is not what you want in this case. Using rgb will
>> force POV to use the values you supply directly.
>>
>
> Also, does this mean that Lightsys is out of date?

No, Lightsys is providing you with linear RGB values, which is exactly 
what you want for use within a raytracer. The rgb keyword in POV is 
meant for this type of thing.

 > This lightened them up a little, but they are still too desaturated.

Could that be because of the bright white background and radiosity?

Post a reply to this message

"Cousin Ricky" <rickysttATyahooDOTcom> wrote:
> Mike Horvath <mik### [at] gmailcom> wrote:
> > On 11/22/2015 4:22 PM, Alain wrote:
> >  > You may try to use rgb instead of srgb.
> >  > If the original render used assumed_gamma 1 and uncorrected rgb values,
> >  > then, using srgb would give incorrect results.
> >
> >
> > Well, the colors are supposed to be exact values using Lightsys. I want
> > to get them physically correct.
>
> Alain is correct.  CIE.inc was written years before the srgb keyword was
> introduced to the POV-Ray 3.7 betas, and was designed for proper use without it,
> using assumed_gamma 1.0.  You already use assumed_gamma 1.0 in this draft, as
> well as in v1.0 of this module (although the included illustration is washed out
> for some reason unknown to me).  The srgb keyword was intended for color values
> from outside sources.  By using it on CIE.inc-generated values, you're just
> messing up what was already physically correct.
>

The original image looks a bit washed out to me, too (although I don't have a
true Munsell color wheel to look at.) I have an idea about why that might be so
(and about why the new 3.7 render looks more saturated, but *possibly* still
incorrect) Just a guess: I assume the original render was done in v3.6xx. *If*
it was rendered with an assumed-Gamma of 1.0 instead of 2.2, then the color
values you chose to use may have been 'gamma-lightened' incorrectly there;
whereas the newer render in 3.7, although set up correctly in the SDL with
#version 3.7 and assumed-gamma 1.0, may itself be doing some gamma-fudging
because of the original color values that were used. Hmm, sounds complicated!
;-)

Over and above all this, my own eyes (and CRT monitor) tell me that there's
something not-quite-right about the *greens* in both images; they look a bit
'olive'-colored to me. That's just a subjective assessment, of course, but I
wonder if anyone else sees it that way?

Something else I noticed: There seem to be shadows falling on some of the color
blocks, at least in the *original* image; perhaps that effect is producing a
somewhat false impression of the colors. Maybe a shadowless light would help(?)

Post a reply to this message

Am 23.11.2015 um 11:41 schrieb Mike Horvath:
> On 11/23/2015 4:42 AM, scott wrote:
>> If MapGamut returns linear RGB values (it looks like it does, I couldn't
>> see anything that indicated it does a rgb->srgb conversion) then you
>> must use the rgb keyword in POV as Alain suggested.
>>
>> The srgb keyword is used to supply colours in srgb space, and POV will
>> then "undo" the srgb gamma correction before using the values
>> internally, which is not what you want in this case. Using rgb will
>> force POV to use the values you supply directly.
>>
> 
> This lightened them up a little, but they are still too desaturated.

You probably need to replace the "ambient" with "emission".

The "ambient" keyword was originally intended as a very simple model for
diffuse illumination from other objects: Even with only one light
source, the shadowed sides of objects aren't completely black, as they
are illuminated by light scattered from other objects. The "ambient"
mechanism models this by simply adding a bit of constant brightness to
an object. (Typical "ambient" values for this purpose would be around 0.1.)

On the other hand, people found that "ambient" could also be used to
model glowing objects, i.e. ones that emit light of their own. (For this
purpose, "ambient" would typically be set to 1.0.)

Enter radiosity. This mechanism is intended to model the same thing that
"ambient" was originally designed for -- light scattered from other
objects -- except that it gives far superior results. So on the one hand
"ambient" is obsolete in scenes with radiosity, and up until 3.6 it
would typically be disabled by either defining the materials to not have
any ambient in the first place, or by setting the global "ambient_light"
to zero to allow re-use of materials designed for non-radiosity scenes.
However, on the other hand, the latter would prevent the use of
"ambient" to model glowing objects.

To solve this dilemma, POV-Ray 3.7 introduced the "emission" keyword,
which now takes over the role of "ambient" for glowing objects, while
the use of "ambient" is now limited to its original role as "poor man's
radiosity", by automatically disabling it whenever radiosity is used.

It seems to me that your original scene didn't use radiosity, so the
"ambient" parameter served both roles there; so now that you have added
radiosity, rather than blindly replacing "ambient 1" with "emission 1"
you will probably have to use a lower value; I think "emission 0.5"
gives good results.

Note however that radiosity messes with the apparent colour of objects,
as it adds some coloured illumination from nearby objects; this may be
undesired in an image intended to represent a colour model, so my
personal recommendation would be to disable radiosity in the scene
again. Alternatively, you may want to set "gray_threshold" to 1.0 to
make radiosity illumination completely colourless.

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