Move POV-ray stuff to a new file

5 files changed, 312 insertions, 263 deletions

diff --git a/src/Makefile.am b/src/Makefile.am
index 5a9cd309..259542fb 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -46,7 +46,7 @@ powder_plot_SOURCES = powder_plot.c cell.c utils.c image.c hdf5-file.c \
                       detector.c
 powder_plot_LDADD = @LIBS@
 
-render_hkl_SOURCES = render_hkl.c cell.c reflections.c utils.c
+render_hkl_SOURCES = render_hkl.c cell.c reflections.c utils.c povray.c
 render_hkl_LDADD = @LIBS@
 
 calibrate_detector_SOURCES = calibrate_detector.c utils.c hdf5-file.c image.c \
diff --git a/src/Makefile.in b/src/Makefile.in
index 403e790e..950b5789 100644
--- a/src/Makefile.in
+++ b/src/Makefile.in
@@ -108,7 +108,7 @@ am_process_hkl_OBJECTS = process_hkl.$(OBJEXT) sfac.$(OBJEXT) \
 process_hkl_OBJECTS = $(am_process_hkl_OBJECTS)
 process_hkl_DEPENDENCIES =
 am_render_hkl_OBJECTS = render_hkl.$(OBJEXT) cell.$(OBJEXT) \
-	reflections.$(OBJEXT) utils.$(OBJEXT)
+	reflections.$(OBJEXT) utils.$(OBJEXT) povray.$(OBJEXT)
 render_hkl_OBJECTS = $(am_render_hkl_OBJECTS)
 render_hkl_DEPENDENCIES =
 DEFAULT_INCLUDES = -I.@am__isrc@ -I$(top_builddir)
@@ -261,7 +261,7 @@ powder_plot_SOURCES = powder_plot.c cell.c utils.c image.c hdf5-file.c \
                       detector.c
 
 powder_plot_LDADD = @LIBS@
-render_hkl_SOURCES = render_hkl.c cell.c reflections.c utils.c
+render_hkl_SOURCES = render_hkl.c cell.c reflections.c utils.c povray.c
 render_hkl_LDADD = @LIBS@
 calibrate_detector_SOURCES = calibrate_detector.c utils.c hdf5-file.c image.c \
                              filters.c peaks.c detector.c cell.c diffraction.c \
@@ -393,6 +393,7 @@ distclean-compile:
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/likelihood.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/pattern_sim.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/peaks.Po@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/povray.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/powder_plot.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/process_hkl.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/reflections.Po@am__quote@
diff --git a/src/povray.c b/src/povray.c
new file mode 100644
index 00000000..69e5b3cc
--- /dev/null
+++ b/src/povray.c
@@ -0,0 +1,281 @@
+/*
+ * povray.c
+ *
+ * Invoke POV-ray
+ *
+ * (c) 2006-2010 Thomas White <taw@physics.org>
+ *
+ * Part of CrystFEL - crystallography with a FEL
+ *
+ */
+
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+
+#include "cell.h"
+#include "utils.h"
+
+
+#define MAX_PROC (256)
+
+
+int povray_render_animation(UnitCell *cell, double *ref,
+                             unsigned int *c, unsigned int nproc)
+{
+	FILE *fh;
+	double asx, asy, asz;
+	double bsx, bsy, bsz;
+	double csx, csy, csz;
+	pid_t pids[MAX_PROC];
+	float max;
+	int i;
+	signed int h, k, l;
+
+	if ( (nproc > MAX_PROC) || (nproc < 1) ) {
+		ERROR("Number of processes must be a number between 1 and %i\n",
+		      MAX_PROC);
+		return 1;
+	}
+
+	fh = fopen("render.pov", "w");
+	fprintf(fh, "/* POV-Ray scene written by CrystFEL */\n\n");
+	fprintf(fh, "#include \"colors.inc\"\n");
+	fprintf(fh, "#include \"textures.inc\"\n\n");
+	fprintf(fh, "global_settings {\n");
+	fprintf(fh, "	assumed_gamma 1.0\n");
+	fprintf(fh, "	ambient_light 5.0\n");
+	fprintf(fh, "}\n\n");
+
+	/* First quarter */
+	fprintf(fh, "#if ( (clock >= 0) & (clock <= 124) )\n");
+	fprintf(fh, "camera { location <0.0, -3.0, 0.0>"
+	            " sky z direction 1.1*y\n"
+	            " right -x*(image_width/image_height)\n"
+	            " look_at <0.0, 0.0, 0.0> }\n\n");
+	fprintf(fh, "#end\n");
+
+	/* Second quarter */
+	fprintf(fh, "#if ( (clock >= 125) & (clock <= 249) )\n");
+	fprintf(fh, "camera { location <0.0,"
+	            " -(2.0+cos(radians((clock-125)*(180/125)))), 0.0>"
+	            " sky z direction 1.1*y\n"
+	            " right -x*(image_width/image_height)\n"
+	            " look_at <0.0, 0.0, 0.0> }\n\n");
+	fprintf(fh, "#end\n");
+
+	/* Third quarter */
+	fprintf(fh, "#if ( (clock >= 250) & (clock <= 374) )\n");
+	fprintf(fh, "camera { location <0.0, -1.0, 0.0>"
+	            " sky z direction 1.1*y\n"
+	            " right -x*(image_width/image_height)\n"
+	            " look_at <0.0, 0.0, 0.0> }\n\n");
+	fprintf(fh, "#end\n");
+
+	/* Fourth quarter */
+	fprintf(fh, "#if ( (clock >= 375) & (clock <= 500) )\n");
+	fprintf(fh, "camera { location <0.0,"
+	            " -(2.0+cos(radians((clock-375)*(180/125)+180))), 0.0>"
+	            " sky z direction 1.1*y\n"
+	            " right -x*(image_width/image_height)\n"
+	            " look_at <0.0, 0.0, 0.0> }\n\n");
+	fprintf(fh, "#end\n");
+
+	fprintf(fh, "light_source { <-3.0 -3.0 3.0> White }\n");
+	fprintf(fh, "light_source { <+3.0 -3.0 3.0> White }\n");
+	fprintf(fh, "light_source { <0.0, -3.0, 0.0> 2*White }\n");
+	fprintf(fh, "plane {z,-2.0 pigment { rgb <0.0, 0.0, 0.1> } }\n");
+	fprintf(fh, "plane {-z,-2.0 pigment { rgb <0.0, 0.0, 0.05> } }\n\n");
+
+	cell_get_reciprocal(cell, &asx, &asy, &asz,
+	                          &bsx, &bsy, &bsz,
+	                          &csx, &csy, &csz);
+
+	fprintf(fh, "#declare WCA = (720/19);\n");
+	fprintf(fh, "#declare WCL = (360/8.5);\n");
+	fprintf(fh, "#declare TA = (4.875);\n");
+	fprintf(fh, "#declare TB = (1.125);\n");
+
+	fprintf(fh, "#declare TRANS = \n");
+	fprintf(fh, "transform {\n");
+
+	/* First half */
+
+	/* Acceleration */
+	fprintf(fh, "#if ( clock <= 24 )\n"
+	"rotate <0, 0, 0.5*WCA*(clock/25)*(clock/25)>\n"
+	"#end\n"
+
+	/* Cruise */
+	"#if ( (clock >= 25) & (clock <= 224) )\n"
+	"rotate <0, 0, (WCA/2)+WCA*((clock-25)/25)>\n"
+	"#end\n"
+
+	/* Overlap */
+
+	/* Deceleration */
+	"#if ( (clock >= 225) & (clock <= 274) )\n"
+	"rotate <0, 0, 360-WCA + WCA*((clock-225)/25) "
+	" - 0.5*(WCA/2)*((clock-225)/25)*((clock-225)/25) >\n"
+	"#end\n"
+
+	/* Acceleration */
+	"#if ( (clock >= 225) & (clock <= 274) )\n"
+	"rotate <0.5*(WCL/2)*((clock-225)/25)*((clock-225)/25), 0, 0>\n"
+	"#end\n"
+
+	/* Second half */
+
+	/* Cruise */
+	"#if ( (clock >= 275) & (clock <= 396) )\n"
+	"rotate <WCL + WCL*((clock-275)/25), 0, 0>\n"
+	"#end\n"
+
+	/* Deceleration to pause */
+	"#if ( (clock >= 397) & (clock <= 421) )\n"
+	"rotate <(1+TA)*WCL+ WCL*((clock-397)/25) "
+	" - 0.5*WCL*((clock-397)/25)*((clock-397)/25), 0, 0 >\n"
+	"#end\n"
+
+	/* Acceleration after pause */
+	"#if ( (clock >= 422) & (clock <= 446) )\n"
+	"rotate <(1.5+TA)*WCL"
+	" + 0.5*WCL*((clock-422)/25)*((clock-422)/25), 0, 0>\n"
+	"#end\n"
+
+	/* Final Cruise */
+	"#if ( (clock >= 447) & (clock <= 474) )\n"
+	"rotate <(2+TA)*WCL + WCL*((clock-447)/25), 0, 0>\n"
+	"#end\n"
+
+	/* Final Deceleration */
+	"#if ( (clock >= 475) & (clock <= 499) )\n"
+	"rotate <(2+TA+TB)*WCL + WCL*((clock-475)/25) "
+	" - 0.5*WCL*((clock-475)/25)*((clock-475)/25), 0, 0 >\n"
+	"#end\n");
+
+	fprintf(fh, "}\n");
+
+	max = 0.5e6;
+	for ( h=-INDMAX; h<INDMAX; h++ ) {
+	for ( k=-INDMAX; k<INDMAX; k++ ) {
+	for ( l=-INDMAX; l<INDMAX; l++ ) {
+
+		float radius, x, y, z;
+		int s;
+		float val, p, r, g, b, trans;
+
+		if ( !lookup_count(c, h, k, l) ) continue;
+
+		val = lookup_intensity(ref, h, k, l);
+
+		val = max-val;
+
+		s = val / (max/6);
+		p = fmod(val, max/6);
+		p /= (max/6);
+
+		r = 0;	g = 0;	b = 0;
+
+		if ( (val < 0.0) ) {
+			s = 0;
+			p = 1.0;
+		}
+		if ( (val > max) ) {
+			s = 6;
+		}
+		switch ( s ) {
+		case 0 :   /* Black to blue */
+			r = 0.0;  g = 0.0;  b = p;
+			break;
+		case 1 :   /* Blue to green */
+			r = 0.0;  g = p;  b = 1.0-p;
+			break;
+		case 2 :   /* Green to red */
+			r =p;  g = 1.0-p;  b = 0.0;
+			break;
+		case 3 :   /* Red to Orange */
+			r = 1.0;  g = 0.5*p;  b = 0.0;
+			break;
+		case 4 :   /* Orange to Yellow */
+			r = 1.0;  g = 0.5 + 0.5*p;  b = 0.0;
+			break;
+		case 5 :   /* Yellow to White */
+			r = 1.0;  g = 1.0;  b = 1.0*p;
+			break;
+		case 6 :   /* Pixel has hit the maximum value */
+			r = 1.0;  g = 1.0;  b = 1.0;
+			break;
+		}
+
+		val = max-val;
+
+		if ( val <= 0.0 ) continue;
+		radius = 0.1 * sqrt(sqrt(val))/1e2;
+		radius -= 0.005;
+		if ( radius > 0.03 ) radius = 0.03;
+		if ( radius <= 0.0 ) continue;
+		trans = (0.03-radius)/0.03;
+		radius += 0.002;
+
+		x = asx*h + bsx*k + csx*l;
+		y = asy*h + bsy*k + csy*l;
+		z = asz*h + bsz*k + csz*l;
+
+		fprintf(fh, "sphere { <%.5f, %.5f, %.5f>, %.5f "
+		            "texture{pigment{color rgb <%f, %f, %f>"
+		            " transmit %f} "
+		            "finish { reflection 0.1 } } \n"
+			    "transform { TRANS }\n"
+			    "}\n",
+			x/1e9, y/1e9, z/1e9, radius, r, g, b, trans);
+
+	}
+	}
+	}
+
+	fprintf(fh, "\n");
+	fclose(fh);
+
+	for ( i=0; i<nproc; i++ ) {
+
+		pids[i] = fork();
+		if ( !( (pids[i] != 0) && (pids[i] != -1) ) ) {
+			if ( pids[i] == -1 ) {
+				ERROR("fork() failed.\n");
+			} else {
+
+				char minf[256];
+				char maxf[256];
+				float nf, xf, nsec;
+
+				nsec = 500.0 / (float)nproc;
+				nf = nsec * (float)i;
+				xf = (nsec * (float)i + nsec) - 1.0;
+
+				snprintf(minf, 255, "+SF%i", (int)nf);
+				snprintf(maxf, 255, "+EF%i", (int)xf);
+
+				/* Forked successfully, child process */
+				execlp("povray", "", "+W1024", "+H768",
+				       "+Irender.pov", "+Orender.png",
+				       "+KFI0", "+KFF499", "+KI0", "+KF499",
+				       minf, maxf, "-D", NULL);
+
+			}
+		} /* else start the next one */
+	}
+
+	for ( i=0; i<nproc; i++ ) {
+		int r;
+		waitpid(pids[i], &r, 0);
+	}
+
+	return 0;
+}
diff --git a/src/povray.h b/src/povray.h
new file mode 100644
index 00000000..f60bd566
--- /dev/null
+++ b/src/povray.h
@@ -0,0 +1,22 @@
+/*
+ * povray.c
+ *
+ * Invoke POV-ray
+ *
+ * (c) 2006-2010 Thomas White <taw@physics.org>
+ *
+ * Part of CrystFEL - crystallography with a FEL
+ *
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#ifndef POVRAY_H
+#define POVRAY_H
+
+extern int povray_render_animation(UnitCell *cell, double *ref,
+                                   unsigned int *c, unsigned int nproc);
+
+#endif	/* POVRAY_H */
diff --git a/src/render_hkl.c b/src/render_hkl.c
index e8590096..e1498b6c 100644
--- a/src/render_hkl.c
+++ b/src/render_hkl.c
@@ -20,23 +20,19 @@
 #include <string.h>
 #include <unistd.h>
 #include <getopt.h>
-#include <sys/types.h>
-#include <sys/wait.h>
 #include <cairo.h>
 #include <cairo-pdf.h>
 
 #include "utils.h"
 #include "reflections.h"
-
-
-#define MAX_PROC (256)
+#include "povray.h"
 
 
 static void show_help(const char *s)
 {
 	printf("Syntax: %s [options] <file.hkl>\n\n", s);
 	printf(
-"Render intensity lists using POV-ray.\n"
+"Render intensity lists in various ways.\n"
 "\n"
 "  -h, --help       Display this help message.\n"
 "      --povray     Render a 3D animation using POV-ray.\n"
@@ -172,253 +168,6 @@ out:
 }
 
 
-static void povray_render_animation(UnitCell *cell, double *ref,
-                                    unsigned int *c, unsigned int nproc)
-{
-	FILE *fh;
-	double asx, asy, asz;
-	double bsx, bsy, bsz;
-	double csx, csy, csz;
-	pid_t pids[MAX_PROC];
-	float max;
-	int i;
-	signed int h, k, l;
-
-	fh = fopen("render.pov", "w");
-	fprintf(fh, "/* POV-Ray scene written by CrystFEL */\n\n");
-	fprintf(fh, "#include \"colors.inc\"\n");
-	fprintf(fh, "#include \"textures.inc\"\n\n");
-	fprintf(fh, "global_settings {\n");
-	fprintf(fh, "	assumed_gamma 1.0\n");
-	fprintf(fh, "	ambient_light 5.0\n");
-	fprintf(fh, "}\n\n");
-
-	/* First quarter */
-	fprintf(fh, "#if ( (clock >= 0) & (clock <= 124) )\n");
-	fprintf(fh, "camera { location <0.0, -3.0, 0.0>"
-	            " sky z direction 1.1*y\n"
-	            " right -x*(image_width/image_height)\n"
-	            " look_at <0.0, 0.0, 0.0> }\n\n");
-	fprintf(fh, "#end\n");
-
-	/* Second quarter */
-	fprintf(fh, "#if ( (clock >= 125) & (clock <= 249) )\n");
-	fprintf(fh, "camera { location <0.0,"
-	            " -(2.0+cos(radians((clock-125)*(180/125)))), 0.0>"
-	            " sky z direction 1.1*y\n"
-	            " right -x*(image_width/image_height)\n"
-	            " look_at <0.0, 0.0, 0.0> }\n\n");
-	fprintf(fh, "#end\n");
-
-	/* Third quarter */
-	fprintf(fh, "#if ( (clock >= 250) & (clock <= 374) )\n");
-	fprintf(fh, "camera { location <0.0, -1.0, 0.0>"
-	            " sky z direction 1.1*y\n"
-	            " right -x*(image_width/image_height)\n"
-	            " look_at <0.0, 0.0, 0.0> }\n\n");
-	fprintf(fh, "#end\n");
-
-	/* Fourth quarter */
-	fprintf(fh, "#if ( (clock >= 375) & (clock <= 500) )\n");
-	fprintf(fh, "camera { location <0.0,"
-	            " -(2.0+cos(radians((clock-375)*(180/125)+180))), 0.0>"
-	            " sky z direction 1.1*y\n"
-	            " right -x*(image_width/image_height)\n"
-	            " look_at <0.0, 0.0, 0.0> }\n\n");
-	fprintf(fh, "#end\n");
-
-	fprintf(fh, "light_source { <-3.0 -3.0 3.0> White }\n");
-	fprintf(fh, "light_source { <+3.0 -3.0 3.0> White }\n");
-	fprintf(fh, "light_source { <0.0, -3.0, 0.0> 2*White }\n");
-	fprintf(fh, "plane {z,-2.0 pigment { rgb <0.0, 0.0, 0.1> } }\n");
-	fprintf(fh, "plane {-z,-2.0 pigment { rgb <0.0, 0.0, 0.05> } }\n\n");
-
-	cell_get_reciprocal(cell, &asx, &asy, &asz,
-	                          &bsx, &bsy, &bsz,
-	                          &csx, &csy, &csz);
-
-	fprintf(fh, "#declare WCA = (720/19);\n");
-	fprintf(fh, "#declare WCL = (360/8.5);\n");
-	fprintf(fh, "#declare TA = (4.875);\n");
-	fprintf(fh, "#declare TB = (1.125);\n");
-
-	fprintf(fh, "#declare TRANS = \n");
-	fprintf(fh, "transform {\n");
-
-	/* First half */
-
-	/* Acceleration */
-	fprintf(fh, "#if ( clock <= 24 )\n"
-	"rotate <0, 0, 0.5*WCA*(clock/25)*(clock/25)>\n"
-	"#end\n"
-
-	/* Cruise */
-	"#if ( (clock >= 25) & (clock <= 224) )\n"
-	"rotate <0, 0, (WCA/2)+WCA*((clock-25)/25)>\n"
-	"#end\n"
-
-	/* Overlap */
-
-	/* Deceleration */
-	"#if ( (clock >= 225) & (clock <= 274) )\n"
-	"rotate <0, 0, 360-WCA + WCA*((clock-225)/25) "
-	" - 0.5*(WCA/2)*((clock-225)/25)*((clock-225)/25) >\n"
-	"#end\n"
-
-	/* Acceleration */
-	"#if ( (clock >= 225) & (clock <= 274) )\n"
-	"rotate <0.5*(WCL/2)*((clock-225)/25)*((clock-225)/25), 0, 0>\n"
-	"#end\n"
-
-	/* Second half */
-
-	/* Cruise */
-	"#if ( (clock >= 275) & (clock <= 396) )\n"
-	"rotate <WCL + WCL*((clock-275)/25), 0, 0>\n"
-	"#end\n"
-
-	/* Deceleration to pause */
-	"#if ( (clock >= 397) & (clock <= 421) )\n"
-	"rotate <(1+TA)*WCL+ WCL*((clock-397)/25) "
-	" - 0.5*WCL*((clock-397)/25)*((clock-397)/25), 0, 0 >\n"
-	"#end\n"
-
-	/* Acceleration after pause */
-	"#if ( (clock >= 422) & (clock <= 446) )\n"
-	"rotate <(1.5+TA)*WCL"
-	" + 0.5*WCL*((clock-422)/25)*((clock-422)/25), 0, 0>\n"
-	"#end\n"
-
-	/* Final Cruise */
-	"#if ( (clock >= 447) & (clock <= 474) )\n"
-	"rotate <(2+TA)*WCL + WCL*((clock-447)/25), 0, 0>\n"
-	"#end\n"
-
-	/* Final Deceleration */
-	"#if ( (clock >= 475) & (clock <= 499) )\n"
-	"rotate <(2+TA+TB)*WCL + WCL*((clock-475)/25) "
-	" - 0.5*WCL*((clock-475)/25)*((clock-475)/25), 0, 0 >\n"
-	"#end\n");
-
-	fprintf(fh, "}\n");
-
-	max = 0.5e6;
-	for ( h=-INDMAX; h<INDMAX; h++ ) {
-	for ( k=-INDMAX; k<INDMAX; k++ ) {
-	for ( l=-INDMAX; l<INDMAX; l++ ) {
-
-		float radius, x, y, z;
-		int s;
-		float val, p, r, g, b, trans;
-
-		if ( !lookup_count(c, h, k, l) ) continue;
-
-		val = lookup_intensity(ref, h, k, l);
-
-		val = max-val;
-
-		s = val / (max/6);
-		p = fmod(val, max/6);
-		p /= (max/6);
-
-		r = 0;	g = 0;	b = 0;
-
-		if ( (val < 0.0) ) {
-			s = 0;
-			p = 1.0;
-		}
-		if ( (val > max) ) {
-			s = 6;
-		}
-		switch ( s ) {
-		case 0 :   /* Black to blue */
-			r = 0.0;  g = 0.0;  b = p;
-			break;
-		case 1 :   /* Blue to green */
-			r = 0.0;  g = p;  b = 1.0-p;
-			break;
-		case 2 :   /* Green to red */
-			r =p;  g = 1.0-p;  b = 0.0;
-			break;
-		case 3 :   /* Red to Orange */
-			r = 1.0;  g = 0.5*p;  b = 0.0;
-			break;
-		case 4 :   /* Orange to Yellow */
-			r = 1.0;  g = 0.5 + 0.5*p;  b = 0.0;
-			break;
-		case 5 :   /* Yellow to White */
-			r = 1.0;  g = 1.0;  b = 1.0*p;
-			break;
-		case 6 :   /* Pixel has hit the maximum value */
-			r = 1.0;  g = 1.0;  b = 1.0;
-			break;
-		}
-
-		val = max-val;
-
-		if ( val <= 0.0 ) continue;
-		radius = 0.1 * sqrt(sqrt(val))/1e2;
-		radius -= 0.005;
-		if ( radius > 0.03 ) radius = 0.03;
-		if ( radius <= 0.0 ) continue;
-		trans = (0.03-radius)/0.03;
-		radius += 0.002;
-
-		x = asx*h + bsx*k + csx*l;
-		y = asy*h + bsy*k + csy*l;
-		z = asz*h + bsz*k + csz*l;
-
-		fprintf(fh, "sphere { <%.5f, %.5f, %.5f>, %.5f "
-		            "texture{pigment{color rgb <%f, %f, %f>"
-		            " transmit %f} "
-		            "finish { reflection 0.1 } } \n"
-			    "transform { TRANS }\n"
-			    "}\n",
-			x/1e9, y/1e9, z/1e9, radius, r, g, b, trans);
-
-	}
-	}
-	}
-
-	fprintf(fh, "\n");
-	fclose(fh);
-
-	for ( i=0; i<nproc; i++ ) {
-
-		pids[i] = fork();
-		if ( !( (pids[i] != 0) && (pids[i] != -1) ) ) {
-			if ( pids[i] == -1 ) {
-				ERROR("fork() failed.\n");
-			} else {
-
-				char minf[256];
-				char maxf[256];
-				float nf, xf, nsec;
-
-				nsec = 500.0 / (float)nproc;
-				nf = nsec * (float)i;
-				xf = (nsec * (float)i + nsec) - 1.0;
-
-				snprintf(minf, 255, "+SF%i", (int)nf);
-				snprintf(maxf, 255, "+EF%i", (int)xf);
-
-				/* Forked successfully, child process */
-				execlp("povray", "", "+W1024", "+H768",
-				       "+Irender.pov", "+Orender.png",
-				       "+KFI0", "+KFF499", "+KI0", "+KF499",
-				       minf, maxf, "-D", NULL);
-
-			}
-		} /* else start the next one */
-	}
-
-	for ( i=0; i<nproc; i++ ) {
-		int r;
-		waitpid(pids[i], &r, 0);
-	}
-}
-
-
 int main(int argc, char *argv[])
 {
 	int c;
@@ -430,6 +179,7 @@ int main(int argc, char *argv[])
 	int config_zoneaxis = 0;
 	unsigned int nproc = 1;
 	char *pdb = NULL;
+	int r = 0;
 
 	/* Long options */
 	const struct option longopts[] = {
@@ -469,11 +219,6 @@ int main(int argc, char *argv[])
 		pdb = strdup("molecule.pdb");
 	}
 
-	if ( (nproc > MAX_PROC) || (nproc < 1) ) {
-		ERROR("Number of processes is invalid.\n");
-		return 1;
-	}
-
 	infile = argv[optind];
 
 	cell = load_cell_from_pdb(pdb);
@@ -489,7 +234,7 @@ int main(int argc, char *argv[])
 	}
 
 	if ( config_povray ) {
-		povray_render_animation(cell, ref, cts, nproc);
+		r = povray_render_animation(cell, ref, cts, nproc);
 	} else if ( config_zoneaxis ) {
 		render_za(cell, ref, cts);
 	} else {
@@ -498,5 +243,5 @@ int main(int argc, char *argv[])
 
 	free(pdb);
 
-	return 0;
+	return r;
 }