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/*
* rendervolume.c
*
* Render the brainsmall data set.
*
* Copyright (c) 1994 The Board of Trustees of The Leland Stanford
* Junior University. All rights reserved.
*
* Permission to use, copy, modify and distribute this software and its
* documentation for any purpose is hereby granted without fee, provided
* that the above copyright notice and this permission notice appear in
* all copies of this software and that you do not sell the software.
* Commercial licensing is available by contacting the author.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND WITHOUT WARRANTY OF ANY KIND,
* EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
* WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
*
* Author:
* Phil Lacroute
* Computer Systems Laboratory
* Electrical Engineering Dept.
* Stanford University
*/
/*
* $Date: 1994/12/31 19:53:03 $
* $Revision: 1.5 $
*/
#include <stdlib.h>
#include "volume.h"
main(argc, argv)
int argc;
char **argv;
{
vpContext *vpc; /* rendering context */
int volume_fd; /* file descriptor for volume (input) */
int octree_fd; /* file descriptor for octree (input) */
int clvolume_fd; /* file descriptor for classified volume (input) */
int use_octree; /* if true, use octree with the unclassified volume */
int use_clvolume; /* if true, use the classified volume */
float density_ramp[DENSITY_MAX+1]; /* opacity as a function of density */
float gradient_ramp[GRADIENT_MAX+1];/* opacity as a function
of gradient magnitude */
int numframes; /* number of frames to render */
float shade_table[NORMAL_MAX+1]; /* shading lookup table */
unsigned char image[IMAGE_WIDTH][IMAGE_HEIGHT]; /* output image */
char filename[512]; /* output file name */
int n;
/* check command-line arguments */
use_octree = 0;
use_clvolume = 0;
numframes = 1;
while (--argc > 0) {
argv++;
if (!strcmp(*argv, "-octree"))
use_octree = 1;
else if (!strcmp(*argv, "-classified"))
use_clvolume = 1;
else if (atoi(*argv) > 0)
numframes = atoi(*argv);
else {
fprintf(stderr, "Usage: %s [-octree | -classified] [numframes]\n",
argv[0]);
exit(1);
}
}
/* create a context */
vpc = vpCreateContext();
/* load input data: either a classified volume, or an unclassified
volume with no octree, or an unclassified volume with an octree */
if (use_clvolume) {
/* load the classified volume data */
if ((clvolume_fd = open(CLVOLUME_FILE, 0)) < 0) {
perror("open");
fprintf(stderr, "could not open %s\n", CLVOLUME_FILE);
exit(1);
}
if (vpLoadClassifiedVolume(vpc, clvolume_fd) != VP_OK) {
fprintf(stderr, "VolPack error: %s\n",
vpGetErrorString(vpGetError(vpc)));
fprintf(stderr, "could not load the volume from file %s\n",
CLVOLUME_FILE);
exit(1);
}
close(clvolume_fd);
} else {
/* load the unclassified volume data */
if ((volume_fd = open(VOLUME_FILE, 0)) < 0) {
perror("open");
fprintf(stderr, "could not open %s\n", VOLUME_FILE);
exit(1);
}
if (vpLoadRawVolume(vpc, volume_fd) != VP_OK) {
fprintf(stderr, "VolPack error: %s\n",
vpGetErrorString(vpGetError(vpc)));
fprintf(stderr, "could not load the volume from file %s\n",
VOLUME_FILE);
exit(1);
}
close(volume_fd);
/* set the classification function */
vpRamp(density_ramp, sizeof(float), DENSITY_RAMP_POINTS, DensityRampX,
DensityRampY);
vpSetClassifierTable(vpc, DENSITY_PARAM, DENSITY_FIELD, density_ramp,
sizeof(density_ramp));
vpRamp(gradient_ramp, sizeof(float), GRADIENT_RAMP_POINTS,
GradientRampX, GradientRampY);
vpSetClassifierTable(vpc, GRADIENT_PARAM, GRADIENT_FIELD,
gradient_ramp, sizeof(gradient_ramp));
vpSetd(vpc, VP_MIN_VOXEL_OPACITY, 0.05);
if (use_octree) {
/* load the octree */
if ((octree_fd = open(OCTREE_FILE, 0)) < 0) {
perror("open");
fprintf(stderr, "could not open %s\n", OCTREE_FILE);
exit(1);
}
if (vpLoadMinMaxOctree(vpc, octree_fd) != VP_OK) {
fprintf(stderr, "VolPack error: %s\n",
vpGetErrorString(vpGetError(vpc)));
fprintf(stderr, "could not load the octree from file %s\n",
OCTREE_FILE);
exit(1);
}
close(octree_fd);
}
}
/* set the shading parameters */
vpSetLookupShader(vpc, 1, 1, NORMAL_FIELD, shade_table,
sizeof(shade_table), 0, NULL, 0);
vpSetMaterial(vpc, VP_MATERIAL0, VP_AMBIENT, VP_BOTH_SIDES,
0.18, 0.18, 0.18);
vpSetMaterial(vpc, VP_MATERIAL0, VP_DIFFUSE, VP_BOTH_SIDES,
0.35, 0.35, 0.35);
vpSetMaterial(vpc, VP_MATERIAL0, VP_SPECULAR, VP_BOTH_SIDES,
0.39, 0.39, 0.39);
vpSetMaterial(vpc, VP_MATERIAL0, VP_SHINYNESS, VP_BOTH_SIDES,10.0,0.0,0.0);
vpSetLight(vpc, VP_LIGHT0, VP_DIRECTION, 0.3, 0.3, 1.0);
vpSetLight(vpc, VP_LIGHT0, VP_COLOR, 1.0, 1.0, 1.0);
vpEnable(vpc, VP_LIGHT0, 1);
vpSetDepthCueing(vpc, 1.4, 1.5);
vpEnable(vpc, VP_DEPTH_CUE, 1);
/* set the initial viewing parameters */
vpSeti(vpc, VP_CONCAT_MODE, VP_CONCAT_LEFT);
vpRotate(vpc, VP_Y_AXIS, 130.0);
vpRotate(vpc, VP_X_AXIS, -15.0);
vpCurrentMatrix(vpc, VP_PROJECT);
vpIdentityMatrix(vpc);
vpWindow(vpc, VP_PARALLEL, -0.5, 0.5, -0.5, 0.5, -0.5, 0.5);
vpCurrentMatrix(vpc, VP_MODEL);
/* set the image buffer */
vpSetImage(vpc, (unsigned char *)image, IMAGE_WIDTH, IMAGE_HEIGHT,
IMAGE_WIDTH, VP_LUMINANCE);
/* render and store the images */
vpSetd(vpc, VP_MAX_RAY_OPACITY, 0.95);
for (n = 0; n < numframes; n++) {
/* compute shading lookup table */
if (vpShadeTable(vpc) != VP_OK) {
fprintf(stderr, "VolPack error: %s\n",
vpGetErrorString(vpGetError(vpc)));
exit(1);
}
/* render */
if (use_clvolume) {
if (vpRenderClassifiedVolume(vpc) != VP_OK) {
fprintf(stderr, "VolPack error: %s\n",
vpGetErrorString(vpGetError(vpc)));
exit(1);
}
} else {
if (vpRenderRawVolume(vpc) != VP_OK) {
fprintf(stderr, "VolPack error: %s\n",
vpGetErrorString(vpGetError(vpc)));
exit(1);
}
}
/* store image */
if (numframes == 1)
strcpy(filename, "brainsmall.ppm");
else
sprintf(filename, "brainsmall_%d.ppm", n + 1000);
StorePGM(image, IMAGE_WIDTH, IMAGE_HEIGHT, filename);
/* rotate by 5 degrees for next image */
vpRotate(vpc, VP_Y_AXIS, 5.0);
}
return(0);
}
StorePGM(image, width, height, filename)
char *image;
int width, height;
char *filename;
{
FILE *image_fp; /* file descriptor for image (output) */
#define PGM_MAGIC1 'P'
#define RPGM_MAGIC2 '5'
if ((image_fp = fopen(filename, "w")) == NULL) {
fprintf(stderr, "cannot open output file %s\n", filename);
exit(1);
}
fprintf(image_fp, "%c%c\n%d %d\n%d\n", PGM_MAGIC1, RPGM_MAGIC2,
width, height, 255);
fwrite(image, 1, width*height, image_fp);
fclose(image_fp);
}
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