#!/usr/bin/perl 

# Make a nice multi-view picture of an object

# Command line arguments contain materials and object files

#

# This is a re-write of Greg's objpict.csh and should be a drop-in

# replacement, with no funcionality added or removed

use strict;

use warnings;

use File::Temp qw/ tempdir /;

my $td = tempdir( CLEANUP => 1 );

my $xres = 800;

my $yres = 800;

my $rpict_cmd = "rpict -av .2 .2 .2 -x $xres -y $yres";

my $inprad = "$td/op$$.rad";

my $testroom = "$td/testroom.rad";

my $octree = "$td/op.oct";

# See if files actually exist.

foreach (@ARGV) {

	if (! -e) {

		die("Can't read file $_\n");

	}

}

# Dump files passed on command line or from STDIN to a temp file.

open(FH, ">$inprad") or

		die("Can\'t write to temporary file $inprad");

while (<>) {

	print FH;

}

close(FH);

# Create some lights and a box as back drop.

# The objects and view points will be inside the box.

open(FH, ">$testroom") or

		die("Can\'t write to temporary file $testroom");

print FH <<EndOfTestroom;

void plastic wall_mat  0  0  5  .681 .543 .686  0 .2

void light bright  0  0  3  3000 3000 3000

bright sphere lamp0  0  0  4  4 4 -4  .1

bright sphere lamp1  0  0  4  4 0 4  .1

bright sphere lamp2  0  0  4  0 4 4  .1

wall_mat polygon box.1540  0  0  12  5 -5 -5  5 -5 5  -5 -5 5  -5 -5 -5

wall_mat polygon box.4620  0  0  12  -5 -5 5  -5 5 5  -5 5 -5  -5 -5 -5

wall_mat polygon box.2310  0  0  12  -5 5 -5  5 5 -5  5 -5 -5  -5 -5 -5

wall_mat polygon box.3267  0  0  12  5 5 -5  -5 5 -5  -5 5 5  5 5 5

wall_mat polygon box.5137  0  0  12  5 -5 5  5 -5 -5  5 5 -5  5 5 5

wall_mat polygon box.6457  0  0  12  -5 5 5  -5 -5 5  5 -5 5  5 5 5

EndOfTestroom

close(FH);

my $dimstr = `getbbox -h $inprad`;

# Values returned by getbbox are indented and padded with spaces.

$dimstr =~ s/(\s)+/\ /g;   # squeeze spaces

$dimstr =~ s/^\ //;   # remove leading space

my @dims = split(/\ /, $dimstr);   # convert to array

# Find largest axes-aligned dimension

my @diffs = ($dims[1]-$dims[0], $dims[3]-$dims[2], $dims[5]-$dims[4]);

@diffs = reverse sort { $a <=> $b } @diffs;

my $size = $diffs[0];

my $vw1 = "-vtl -vp 2 .5 .5 -vd -1 0 0 -vh 1 -vv 1";

my $vw2 = "-vtl -vp .5 2 .5 -vd 0 -1 0 -vh 1 -vv 1";

my $vw3 = "-vtl -vp .5 .5 2 -vd 0 0 -1 -vu -1 0 0 -vh 1 -vv 1";

my $vw4 = "-vp 3 3 3 -vd -1 -1 -1 -vh 20 -vv 20";

# Move objects so centre is at origin

my $xtrans = -1.0 * ($dims[0] + $dims[1]) / 2;

my $ytrans = -1.0 * ($dims[2] + $dims[3]) / 2;

my $ztrans = -1.0 * ($dims[4] + $dims[5]) / 2;

# Scale so that largest object dimension is unity

my $scale = 1 / $size;

my $cmd = "xform -t $xtrans $ytrans $ztrans -s $scale -t .5 .5 .5 $inprad";

$cmd .= " |oconv $testroom - > $octree";

system "$cmd";

# Render four different views of the objects

system "$rpict_cmd $vw1 $octree > $td/right.hdr";

system "$rpict_cmd $vw2 $octree > $td/front.hdr";

system "$rpict_cmd $vw3 $octree > $td/down.hdr";

system "$rpict_cmd $vw4 $octree > $td/oblique.hdr";

# Compose the four views into one image

$cmd = "pcompos $td/down.hdr 0 $xres $td/oblique.hdr $xres $yres";

$cmd .= " $td/right.hdr 0 0 $td/front.hdr $xres 0";

$cmd .= " |pfilt -1 -r .6 -x /2 -y /2";

exec "$cmd";

#EOF