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libpr1.c
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libpr1.c
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/*
* libpr1.c - a library of primitive object output routines, part 1 of 3.
* Lights, cameras, textures.
*
* Author: Eric Haines
*
* Modified: 1 December 2012 - Added support for re-using identical colours
* if using delayed output. Changes to lib_output_color,
* case OUTPUT_DELAYED. Added local lookup_surface_index function
* Sam [sbt] Thompson
*
*/
/*-----------------------------------------------------------------*/
/* include section */
/*-----------------------------------------------------------------*/
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <string.h>
#include "lib.h"
#include "drv.h"
/*-----------------------------------------------------------------*/
/* defines/constants section */
/*-----------------------------------------------------------------*/
/*-----------------------------------------------------------------*/
#ifdef ANSI_FN_DEF
void lib_output_comment (char *comment)
#else
void lib_output_comment (comment)
char *comment;
#endif
{
switch (gRT_out_format) {
case OUTPUT_VIDEO:
case OUTPUT_DELAYED:
case OUTPUT_RAWTRI:
case OUTPUT_DXF: /* well, there's the 999 format, but... >>>>> */
case OUTPUT_RWX:
/* no comments allowed for these file formats */
break;
case OUTPUT_NFF:
case OUTPUT_OBJ:
case OUTPUT_RIB:
case OUTPUT_3DMF:
case OUTPUT_VRML1:
case OUTPUT_VRML2:
fprintf(gOutfile, "# %s\n", comment);
break;
case OUTPUT_RAYSHADE:
case OUTPUT_POLYRAY:
case OUTPUT_POVRAY_10:
case OUTPUT_POVRAY_20:
case OUTPUT_POVRAY_30:
fprintf(gOutfile, "// %s\n", comment);
break;
/* unknown comment formats... whoever knows, please fix or fill in! */
case OUTPUT_PLG:
case OUTPUT_VIVID:
case OUTPUT_RTRACE:
case OUTPUT_QRT:
case OUTPUT_ART:
default:
fprintf(gOutfile, "// <comment> '%s'\n", comment);
break;
}
} /* lib_output_comment */
/*-----------------------------------------------------------------*/
#ifdef ANSI_FN_DEF
void lib_output_vector (double x, double y, double z)
#else
void lib_output_vector(x, y, z)
double x, y, z;
#endif
{
switch (gRT_out_format) {
case OUTPUT_VIDEO:
case OUTPUT_DELAYED:
case OUTPUT_DXF:
case OUTPUT_RWX:
break;
case OUTPUT_PLG:
case OUTPUT_OBJ:
case OUTPUT_NFF:
case OUTPUT_VIVID:
case OUTPUT_RAYSHADE:
case OUTPUT_RTRACE:
case OUTPUT_RAWTRI:
case OUTPUT_3DMF:
case OUTPUT_VRML1:
case OUTPUT_VRML2:
fprintf(gOutfile, "%g %g %g", x, y, z);
break;
case OUTPUT_POVRAY_10:
fprintf(gOutfile, "<%g %g %g>", x, y, z);
break;
case OUTPUT_POVRAY_20:
case OUTPUT_POVRAY_30:
fprintf(gOutfile, "<%g, %g, %g>", x, y, z);
break;
case OUTPUT_POLYRAY:
case OUTPUT_QRT:
case OUTPUT_ART:
fprintf(gOutfile, "%g, %g, %g", x, y, z);
break;
default:
fprintf(stderr, "Internal Error: bad file type in libpr1.c\n");
exit(1);
break;
}
} /* lib_output_vector */
/*-----------------------------------------------------------------*/
#ifdef ANSI_FN_DEF
void axis_to_z (COORD3 axis, double *xang, double *yang)
#else
void axis_to_z(axis, xang, yang)
COORD3 axis;
double *xang, *yang;
#endif
{
double len;
/* The axis is in RH coordinates and turns the axis to Z axis */
/* The angles are for the LH coordinate system */
len = sqrt(axis[X] * axis[X] + axis[Z] * axis[Z]);
*xang = -180.0 * asin(axis[Y]) / PI;
if (len < EPSILON)
*yang = 0.0;
else
*yang = 180.0 * acos(axis[Z] / len) / PI;
if (axis[X] < 0)
*yang = -(*yang);
} /* axis_to_z */
/*-----------------------------------------------------------------*/
/*
* Output viewpoint location. The parameters are:
* From: The eye location.
* At: A position to be at the center of the image. A.k.a. "lookat"
* Up: A vector defining which direction is up.
* Fov: Vertical field of view of the camera
* Aspect: Aspect ratio of horizontal fov to vertical fov
* Hither: Minimum distance to any ray-surface intersection
* Resx: X resolution of resulting image
* Resy: Y resolution of resulting image
*
* For all databases some viewing parameters are always the same:
*
* Viewing angle is defined as from the center of top pixel row to bottom
* pixel row and left column to right column.
* Yon is "at infinity."
*/
#ifdef ANSI_FN_DEF
void lib_output_viewpoint (COORD3 from, COORD3 at, COORD3 up,
double fov_angle, double aspect_ratio,
double hither, int resx, int resy)
#else
void lib_output_viewpoint(from, at, up,
fov_angle, aspect_ratio, hither,
resx, resy)
COORD3 from, at, up;
double fov_angle, aspect_ratio, hither;
int resx, resy;
#endif
{
COORD3 axis, myright, tmp;
COORD4 viewvec, rightvec;
MATRIX m1;
double tmpf;
double frustrumheight, frustrumwidth;
switch (gRT_out_format) {
case OUTPUT_DELAYED:
case OUTPUT_VIDEO:
case OUTPUT_PLG:
case OUTPUT_OBJ:
case OUTPUT_RWX:
/* Save the various view parameters */
COPY_COORD3(gViewpoint.from, from);
COPY_COORD3(gViewpoint.at, at);
COPY_COORD3(gViewpoint.up, up);
gViewpoint.angle = fov_angle;
gViewpoint.hither = hither;
gViewpoint.resx = resx;
gViewpoint.resy = resy;
gViewpoint.aspect = aspect_ratio;
/* Make the 3D clipping box for this view */
gView_bounds[0][0] = 0;
gView_bounds[1][0] = gViewpoint.resx;
gView_bounds[0][1] = 0;
gView_bounds[1][1] = gViewpoint.resy;
gView_bounds[0][2] = gViewpoint.hither;
gView_bounds[1][2] = 1.0e10;
/* Generate the perspective view matrix */
lib_create_view_matrix(gViewpoint.tx, gViewpoint.from, gViewpoint.at,
gViewpoint.up, gViewpoint.resx, gViewpoint.resy,
gViewpoint.angle, gViewpoint.aspect);
/* Turn on graphics using system dependent video routines */
if (gRT_out_format == OUTPUT_VIDEO) {
display_init(gViewpoint.resx, gViewpoint.resy, gBkgnd_color);
gView_init_flag = 1;
}
break;
case OUTPUT_NFF:
fprintf(gOutfile, "v\n");
fprintf(gOutfile, "from %g %g %g\n", from[X], from[Y], from[Z]);
fprintf(gOutfile, "at %g %g %g\n", at[X], at[Y], at[Z]);
fprintf(gOutfile, "up %g %g %g\n", up[X], up[Y], up[Z]);
fprintf(gOutfile, "angle %g\n", fov_angle);
fprintf(gOutfile, "hither %g\n", hither);
fprintf(gOutfile, "resolution %d %d\n", resx, resy);
break;
case OUTPUT_POVRAY_10:
case OUTPUT_POVRAY_20:
case OUTPUT_POVRAY_30:
/* Let's get a set of vectors that are all at right angles to each
other that describe the view given. */
lib_normalize_vector(up);
SUB3_COORD3(viewvec, at, from);
lib_normalize_vector(viewvec);
CROSS(rightvec, up, viewvec);
lib_normalize_vector(rightvec);
CROSS(up, viewvec, rightvec);
lib_normalize_vector(up);
/* Calculate the height of the view frustrum in world coordinates.
and then scale the right and up vectors appropriately. */
frustrumheight = 2.0 * tan(PI * fov_angle / 360.0);
frustrumwidth = aspect_ratio * frustrumheight;
up[X] *= frustrumheight;
up[Y] *= frustrumheight;
up[Z] *= frustrumheight;
rightvec[X] *= frustrumwidth;
rightvec[Y] *= frustrumwidth;
rightvec[Z] *= frustrumwidth;
tab_indent();
fprintf(gOutfile, "camera {\n");
tab_inc();
tab_indent();
fprintf(gOutfile, "location ");
lib_output_vector(from[X], from[Y], from[Z]);
fprintf(gOutfile, "\n");
tab_indent();
fprintf(gOutfile, "direction ");
lib_output_vector(viewvec[X], viewvec[Y], viewvec[Z]);
fprintf(gOutfile, "\n");
tab_indent();
fprintf(gOutfile, "right ");
lib_output_vector(-rightvec[X], -rightvec[Y], -rightvec[Z]);
fprintf(gOutfile, "\n");
tab_indent();
fprintf(gOutfile, "up ");
lib_output_vector(up[X], up[Y], up[Z]);
fprintf(gOutfile, "\n");
tab_dec();
fprintf(gOutfile, "} // camera\n\n");
break;
case OUTPUT_POLYRAY:
tab_indent();
fprintf(gOutfile, "viewpoint {\n");
tab_inc();
tab_indent();
fprintf(gOutfile, "from <%g, %g, %g>\n", from[X], from[Y], from[Z]);
tab_indent();
fprintf(gOutfile, "at <%g, %g, %g>\n", at[X], at[Y], at[Z]);
tab_indent();
fprintf(gOutfile, "up <%g, %g, %g>\n", up[X], up[Y], up[Z]);
tab_indent();
fprintf(gOutfile, "angle %g\n", fov_angle);
tab_indent();
/* Note the negative, this is to change to right handed
coordinates (like most of the other tracers) */
fprintf(gOutfile, "aspect %g\n", -aspect_ratio);
tab_indent();
fprintf(gOutfile, "hither %g\n", hither);
tab_indent();
fprintf(gOutfile, "resolution %d, %d\n", resx, resy);
tab_dec();
tab_indent();
fprintf(gOutfile, "}\n");
fprintf(gOutfile, "\n");
break;
case OUTPUT_VIVID:
tab_indent();
fprintf(gOutfile, "studio {\n");
tab_inc();
tab_indent();
fprintf(gOutfile, "from %g %g %g\n", from[X], from[Y], from[Z]);
tab_indent();
fprintf(gOutfile, "at %g %g %g\n", at[X], at[Y], at[Z]);
tab_indent();
fprintf(gOutfile, "up %g %g %g\n", up[X], up[Y], up[Z]);
tab_indent();
fprintf(gOutfile, "angle %g\n", fov_angle);
tab_indent();
fprintf(gOutfile, "aspect %g\n", aspect_ratio);
tab_indent();
fprintf(gOutfile, "resolution %d %d\n", resx, resy);
tab_indent();
fprintf(gOutfile, "no_exp_trans\n");
tab_dec();
tab_indent();
fprintf(gOutfile, "}\n");
fprintf(gOutfile, "\n");
break;
case OUTPUT_QRT:
tab_indent();
fprintf(gOutfile, "OBSERVER = (\n");
tab_inc();
tab_indent();
fprintf(gOutfile, "loc = (%g,%g,%g),\n", from[X], from[Y], from[Z]);
tab_indent();
fprintf(gOutfile, "lookat = (%g,%g,%g),\n", at[X], at[Y], at[Z]);
tab_indent();
fprintf(gOutfile, "up = (%g,%g,%g)\n", up[X], up[Y], up[Z]);
tab_dec();
tab_indent();
fprintf(gOutfile, ")\n");
tab_indent();
fprintf(gOutfile, "FOC_LENGTH = %g\n",
35.0 / tan(PI * fov_angle / 360.0));
tab_indent();
fprintf(gOutfile, "DEFAULT (\n");
tab_inc();
tab_indent();
fprintf(gOutfile, "aspect = %g,\n", 6.0 * aspect_ratio / 7.0);
tab_indent();
fprintf(gOutfile, "x_res = %d, y_res = %d\n", resx, resy);
tab_dec();
tab_indent();
fprintf(gOutfile, ")\n");
/* QRT insists on having the output file as part of the data text */
tab_indent();
fprintf(gOutfile, "FILE_NAME = qrt.tga\n");
break;
case OUTPUT_RAYSHADE:
fprintf(gOutfile, "eyep %g %g %g\n", from[X], from[Y], from[Z]);
fprintf(gOutfile, "lookp %g %g %g\n", at[X], at[Y], at[Z]);
fprintf(gOutfile, "up %g %g %g\n", up[X], up[Y], up[Z]);
fprintf(gOutfile, "fov %g %g\n", aspect_ratio * fov_angle,
fov_angle);
fprintf(gOutfile, "screen %d %d\n", resx, resy);
fprintf(gOutfile, "sample 1 nojitter\n");
break;
case OUTPUT_RTRACE:
fprintf(gOutfile, "View\n");
fprintf(gOutfile, "%g %g %g\n", from[X], from[Y], from[Z]);
fprintf(gOutfile, "%g %g %g\n", at[X], at[Y], at[Z]);
fprintf(gOutfile, "%g %g %g\n", up[X], up[Y], up[Z]);
fprintf(gOutfile, "%g %g\n", aspect_ratio * fov_angle/2,
fov_angle/2);
break;
case OUTPUT_ART:
fprintf(gOutfile, "maxhitlevel 4\n");
fprintf(gOutfile, "screensize 0.0, 0.0\n");
fprintf(gOutfile, "fieldofview %g\n", fov_angle);
fprintf(gOutfile, "up(%g, %g, %g)\n", up[X], up[Y], up[Z]);
fprintf(gOutfile, "lookat(%g, %g, %g, ", from[X], from[Y], from[Z]);
fprintf(gOutfile, "%g, %g, %g, 0.0)\n", at[X], at[Y], at[Z]);
fprintf(gOutfile, "\n");
break;
case OUTPUT_RAWTRI:
break;
case OUTPUT_RIB:
//fprintf(gOutfile, "version 3.03\n");
fprintf(gOutfile, "FrameBegin 1\n");
fprintf(gOutfile, "Format %d %d 1\n", resx, resy);
fprintf(gOutfile, "PixelSamples 1 1\n");
fprintf(gOutfile, "ShadingRate 1.0\n");
//fprintf(gOutfile, "Declare \"reflected\" \"float\"\n");
//fprintf(gOutfile, "Declare \"transmitted\" \"float\"\n");
//fprintf(gOutfile, "Declare \"index\" \"float\"\n");
//fprintf(gOutfile, "Option \"render\" \"max_raylevel\" [4]\n");
fprintf(gOutfile, "Attribute \"visibility\" \"int trace\" [1]\n");
fprintf(gOutfile, "Attribute \"visibility\" \"string transmission\" [\"opaque\"]\n");
fprintf(gOutfile, "Attribute \"trace\" \"int maxspeculardepth\" [4]\n");
fprintf(gOutfile, "Projection \"perspective\" \"fov\" %#g\n",
fov_angle);
fprintf(gOutfile, "Clipping %#g %#g\n\n", hither, 1e38);
/* Calculate transformation from intrisic position */
SUB3_COORD3(axis, at, from);
lib_normalize_vector(axis);
COPY_COORD3(tmp,axis);
tmpf = DOT_PRODUCT(up,axis);
tmp[0] *= tmpf; tmp[1] *= tmpf; tmp[2] *= tmpf;
SUB2_COORD3(up,tmp);
lib_normalize_vector(up);
CROSS(myright,up,axis);
lib_normalize_vector (myright);
m1[0][0] = myright[0]; m1[1][0] = myright[1];
m1[2][0] = myright[2]; m1[3][0] = 0;
m1[0][1] = up[0]; m1[1][1] = up[1];
m1[2][1] = up[2]; m1[3][1] = 0;
m1[0][2] = axis[0]; m1[1][2] = axis[1];
m1[2][2] = axis[2]; m1[3][2] = 0;
m1[0][3] = 0; m1[1][3] = 0; m1[2][3] = 0; m1[3][3] = 1;
fprintf (gOutfile, "ConcatTransform [%g %g %g %g %g %g %g %g %g %g %g %g %g %g %g %g]\n",
m1[0][0], m1[0][1], m1[0][2], m1[0][3],
m1[1][0], m1[1][1], m1[1][2], m1[1][3],
m1[2][0], m1[2][1], m1[2][2], m1[2][3],
m1[3][0], m1[3][1], m1[3][2], m1[3][3]);
fprintf (gOutfile, "Translate %g %g %g\n", -from[0], -from[1], -from[2]);
fprintf(gOutfile, "WorldBegin\n");
tab_inc();
break ;
case OUTPUT_DXF:
fprintf(gOutfile, " 0\n" ) ;
fprintf(gOutfile, "SECTION\n" ) ;
fprintf(gOutfile, " 2\n" ) ;
fprintf(gOutfile, "HEADER\n" ) ;
fprintf(gOutfile, " 0\n" ) ;
fprintf(gOutfile, "ENDSEC\n" ) ;
fprintf(gOutfile, " 0\n" ) ;
fprintf(gOutfile, "SECTION\n" ) ;
fprintf(gOutfile, " 2\n" ) ;
fprintf(gOutfile, "ENTITIES\n" ) ;
/* should add view someday ... */
break;
case OUTPUT_3DMF:
tab_indent();
fprintf(gOutfile, "Container (\n");
tab_inc();
tab_indent();
fprintf(gOutfile, "ViewAngleAspectCamera ( %g %g )\n",
fov_angle, aspect_ratio);
tab_indent();
fprintf(gOutfile, "CameraPlacement ( %g %g %g %g %g %g %g %g %g )\n",
from[X], from[Y], from[Z],
at[X], at[Y], at[Z],
up[X], up[Y], up[Z]);
tab_dec();
tab_indent();
fprintf(gOutfile, ")\n");
tab_indent();
fprintf(gOutfile, "Container (\n");
tab_inc();
tab_indent();
fprintf(gOutfile, "ViewHints ( )\n");
tab_indent();
fprintf(gOutfile, "ImageDimensions ( %d %d )\n",
resx, resy);
tab_dec();
tab_indent();
fprintf(gOutfile, ")\n");
break;
case OUTPUT_VRML1:
tab_indent();
fprintf(gOutfile, "PerspectiveCamera {\n");
tab_inc();
tab_indent();
fprintf(gOutfile, "heightAngle %g\n", DEG2RAD(fov_angle));
tab_indent();
fprintf(gOutfile, "position %g %g %g\n",
from[X], from[Y], from[Z]);
tab_indent();
lib_calc_view_vector(from, at, up, viewvec);
fprintf(gOutfile, "orientation %g %g %g %g\n",
viewvec[0], viewvec[1], viewvec[2], viewvec[3]);
tab_dec();
tab_indent();
fprintf(gOutfile, "}\n");
break;
case OUTPUT_VRML2:
tab_indent();
fprintf(gOutfile, "Viewpoint {\n");
tab_inc();
tab_indent();
fprintf(gOutfile, "fieldOfView %g\n", DEG2RAD(fov_angle));
tab_indent();
fprintf(gOutfile, "position %g %g %g\n",
from[X], from[Y], from[Z]);
tab_indent();
lib_calc_view_vector(from, at, up, viewvec);
fprintf(gOutfile, "orientation %g %g %g %g\n",
viewvec[0], viewvec[1], viewvec[2], viewvec[3]);
tab_dec();
tab_indent();
fprintf(gOutfile, "}\n");
break;
default:
fprintf(stderr, "Internal Error: bad file type in libpr1.c\n");
exit(1);
break;
}
}
/*-----------------------------------------------------------------*/
/*
* Output light. A light is defined by position. All lights have the same
* intensity.
*
*/
#ifdef ANSI_FN_DEF
void lib_output_light (COORD4 center_pt)
#else
void lib_output_light(center_pt)
COORD4 center_pt;
#endif
{
COORD3 vec;
MATRIX txmat;
double lscale;
light_ptr new_light;
if (center_pt[W] != 0.0)
lscale = center_pt[W];
else
lscale = 1.0;
COPY_COORD3(vec, center_pt);
if (lib_tx_active()) {
/* Transform the location of the light (it's a point so that's
all we need to do) */
lib_get_current_tx(txmat);
lib_transform_vector(vec, vec, txmat);
}
switch (gRT_out_format) {
case OUTPUT_DELAYED:
new_light = (light_ptr)malloc(sizeof(struct light_struct));
if (new_light == NULL)
/* Quietly fail & return */
return;
COPY_COORD4(new_light->center_pt, center_pt);
new_light->center_pt[W] = lscale;
new_light->next = gLib_lights;
gLib_lights = new_light;
break;
case OUTPUT_VIDEO:
case OUTPUT_PLG:
case OUTPUT_OBJ:
case OUTPUT_RWX:
/* Not currently doing anything with lights */
break;
case OUTPUT_NFF:
fprintf(gOutfile, "l %g %g %g\n",
vec[X], vec[Y], vec[Z]);
break;
case OUTPUT_POVRAY_10:
tab_indent();
fprintf(gOutfile, "object {\n");
tab_inc();
tab_indent();
fprintf(gOutfile, "light_source {\n");
tab_inc();
tab_indent();
fprintf(gOutfile, "<%g %g %g>",
vec[X], vec[Y], vec[Z]);
fprintf(gOutfile, " color red %g green %g blue %g\n",
lscale, lscale, lscale);
tab_dec();
tab_indent();
fprintf(gOutfile, "} // light\n");
tab_dec();
tab_indent();
fprintf(gOutfile, "} // object\n");
fprintf(gOutfile, "\n");
break;
case OUTPUT_POVRAY_20:
case OUTPUT_POVRAY_30:
tab_indent();
fprintf(gOutfile, "light_source {\n");
tab_inc();
tab_indent();
fprintf(gOutfile, "<%g, %g, %g>",
vec[X], vec[Y], vec[Z]);
fprintf(gOutfile, " color red %g green %g blue %g\n",
lscale, lscale, lscale);
tab_dec();
tab_indent();
fprintf(gOutfile, "} // light\n");
fprintf(gOutfile, "\n");
break;
case OUTPUT_POLYRAY:
tab_indent();
fprintf(gOutfile, "light <%g, %g, %g>, <%g, %g, %g>\n",
lscale, lscale, lscale,
vec[X], vec[Y], vec[Z]);
fprintf(gOutfile, "\n");
break;
case OUTPUT_VIVID:
tab_indent();
fprintf(gOutfile, "light {type point position %g %g %g",
vec[X], vec[Y], vec[Z]);
fprintf(gOutfile, " color %g %g %g }\n",
lscale, lscale, lscale);
fprintf(gOutfile, "\n");
break;
case OUTPUT_QRT:
tab_indent();
fprintf(gOutfile, "LAMP ( loc = (%g,%g,%g), dist = 0, radius = 1,",
vec[X], vec[Y], vec[Z]);
fprintf(gOutfile, " amb = (%g,%g,%g) )\n",
lscale, lscale, lscale);
break;
case OUTPUT_RAYSHADE:
fprintf(gOutfile, "light %g point %g %g %g\n",
lscale, vec[X], vec[Y], vec[Z]);
break;
case OUTPUT_RTRACE:
fprintf(gOutfile, "1 %g %g %g %g %g %g\n",
vec[X], vec[Y], vec[Z], lscale, lscale, lscale);
break;
case OUTPUT_ART:
tab_indent();
fprintf(gOutfile, "light \n{");
tab_inc();
tab_indent();
fprintf(gOutfile, "location(%g, %g, %g) colour 0.5, 0.5, 0.5\n",
vec[X], vec[Y], vec[Z]);
tab_dec();
tab_indent();
fprintf(gOutfile, "}\n");
fprintf(gOutfile, "\n");
break;
case OUTPUT_RAWTRI:
case OUTPUT_DXF:
break;
case OUTPUT_RIB:
{
static int number= 0;
//fprintf(gOutfile, "Attribute \"light\" \"shadows\" \"on\"\n");
fprintf(gOutfile, "LightSource \"shadowspot\" %d \"from\" [ %#g %#g %#g ] \"intensity\" [20] \"shadowname\" [\"raytrace\"]\n",
number++,
vec[X], vec[Y], vec[Z]);
//fprintf(gOutfile, "LightSource \"pointlight\" %d \"from\" [ %#g %#g %#g ] \"intensity\" [20]\n",
// number++,
// vec[X], vec[Y], vec[Z]);
}
break;
case OUTPUT_3DMF:
tab_indent();
fprintf(gOutfile, "Container (\n");
tab_inc();
tab_indent();
fprintf(gOutfile, "PointLight ( %g %g %g 1 0 0 True )\n",
vec[X], vec[Y], vec[Z]);
tab_indent();
fprintf(gOutfile, "LightData ( True %g 1 1 1 )\n", lscale);
tab_dec();
tab_indent();
fprintf(gOutfile, ")\n");
break;
case OUTPUT_VRML1:
case OUTPUT_VRML2:
tab_indent();
fprintf(gOutfile, "PointLight {\n");
tab_inc();
tab_indent();
fprintf(gOutfile, "color 1 1 1\n");
tab_indent();
fprintf(gOutfile, "intensity %g\n", lscale);
tab_indent();
fprintf(gOutfile, "location %g %g %g\n",
vec[X], vec[Y], vec[Z]);
tab_indent();
fprintf(gOutfile, "on TRUE\n");
tab_dec();
tab_indent();
fprintf(gOutfile, "}\n");
break;
default:
fprintf(stderr, "Internal Error: bad file type in libpr1.c\n");
exit(1);
break;
}
}
/*-----------------------------------------------------------------*/
/*
* Output background color. A color is simply RGB (monitor dependent, but
* that's life).
*/
#ifdef ANSI_FN_DEF
void lib_output_background_color (COORD3 color)
#else
void lib_output_background_color(color)
COORD3 color;
#endif
{
switch (gRT_out_format) {
case OUTPUT_VIDEO:
case OUTPUT_DELAYED:
case OUTPUT_PLG:
case OUTPUT_OBJ:
case OUTPUT_RWX:
COPY_COORD3(gBkgnd_color, color);
break;
case OUTPUT_NFF:
fprintf(gOutfile, "b %g %g %g\n", color[X], color[Y], color[Z]);
break;
case OUTPUT_POVRAY_10:
tab_indent();
fprintf(gOutfile, "// POV-Ray 1.0 scene file\n");
/* POV-Ray 1.0 does not support a background color */
/* Instead, create arbitrarily large enclosing sphere of that
* color */
tab_indent();
fprintf(gOutfile, "// background color:\n");
tab_indent();
fprintf(gOutfile, "object {\n");
tab_inc();
tab_indent();
fprintf(gOutfile, "sphere { <0 0 0> 9000 ");
fprintf(gOutfile,
"texture { ambient 1 diffuse 0 color red %g green %g blue %g } }\n",
color[X], color[Y], color[Z]);
tab_dec();
tab_indent();
fprintf(gOutfile, "} // object - background\n");
fprintf(gOutfile, "\n");
break;
case OUTPUT_POVRAY_20:
case OUTPUT_POVRAY_30:
if (gRT_out_format==OUTPUT_POVRAY_20)
{
tab_indent();
fprintf(gOutfile, "// POV-Ray 2 scene file\n");
}
else
{
tab_indent();
fprintf(gOutfile, "// POV-Ray 3 scene file\n");
}
tab_indent();
fprintf(gOutfile, "background { color red %g green %g blue %g }\n",
color[X], color[Y], color[Z]);
fprintf(gOutfile, "\n");
break;
case OUTPUT_POLYRAY:
tab_indent();
fprintf(gOutfile, "background <%g, %g, %g>\n",
color[X], color[Y], color[Z]);
fprintf(gOutfile, "\n");
break;
case OUTPUT_VIVID:
/* Vivid insists on putting the background into the studio */
tab_indent();
fprintf(gOutfile, "studio { background %g %g %g }\n",
color[X], color[Y], color[Z]);
fprintf(gOutfile, "\n");
break;
case OUTPUT_QRT:
tab_indent();
fprintf(gOutfile, "SKY ( horiz = (%g,%g,%g), zenith = (%g,%g,%g),",
color[X], color[Y], color[Z],
color[X], color[Y], color[Z]);
fprintf(gOutfile, " dither = 0 )\n");
break;
case OUTPUT_RAYSHADE:
fprintf(gOutfile, "background %g %g %g\n",
color[X], color[Y], color[Z]);
break;
case OUTPUT_RTRACE:
fprintf(gOutfile, "Colors\n");
fprintf(gOutfile, "%g %g %g\n", color[X], color[Y], color[Z]);
fprintf(gOutfile, "0 0 0\n");
break;
case OUTPUT_RAWTRI:
case OUTPUT_DXF:
break;
case OUTPUT_ART:
tab_indent();
fprintf(gOutfile, "background %g, %g, %g\n",
color[X], color[Y], color[Z]);
fprintf(gOutfile, "\n");
break;
case OUTPUT_RIB:
fprintf(gOutfile, "# Background color [%#g %#g %#g]\n",
color[X], color[Y], color[Z]);
break;
case OUTPUT_3DMF:
tab_indent();
fprintf(gOutfile, "Container (\n");
tab_inc();
tab_indent();
fprintf(gOutfile, "ViewHints ( )\n");
tab_indent();
fprintf(gOutfile, "ImageClearColor ( %g %g %g )\n",
color[X], color[Y], color[Z]);
tab_dec();
tab_indent();
fprintf(gOutfile, ")\n");
break;
case OUTPUT_VRML1:
/* no standard way in 1.0 spec of describing the background color */
break;
case OUTPUT_VRML2:
tab_indent();
fprintf(gOutfile, "Background {\n");
tab_inc();
tab_indent();
fprintf(gOutfile, "skyColor [ %g %g %g ]\n",
color[X], color[Y], color[Z]);
tab_dec();
tab_indent();
fprintf(gOutfile, "}\n");
break;
default:
fprintf(stderr, "Internal Error: bad file type in libpr1.c\n");
exit(1);
break;
}
}
/*-----------------------------------------------------------------*/
#ifdef ANSI_FN_DEF
static char * create_surface_name(char *name, int val)
#else
static char * create_surface_name(name, val)
char *name;
int val;
#endif
{
char *txname;
if (name != NULL)
return name;
txname = (char *)malloc(7*sizeof(char));
if (txname == NULL)
return NULL;
sprintf(txname, "txt%03d", val);
txname[6] = '\0';
return txname;
}
/*-----------------------------------------------------------------*/
#ifdef ANSI_FN_DEF
static int lookup_surface_index(COORD3 color, double ka,
double kd, double ks, double ks_spec,
double ang, double kt, double i_of_r)
#else
static int lookup_surface_index(color, ka, kd, ks, ks_spec, ang, kt, i_of_r)
COORD3 color;
double ka, kd, ks, ks_spec, ang, kt, i_of_r;
#endif
{
surface_ptr temp_ptr = gLib_surfaces;
while (temp_ptr != NULL)
if ((ABSOLUTE(temp_ptr->color[R_COLOR] - color[R_COLOR]) < EPSILON) &&
(ABSOLUTE(temp_ptr->color[G_COLOR] - color[G_COLOR]) < EPSILON) &&
(ABSOLUTE(temp_ptr->color[B_COLOR] - color[B_COLOR]) < EPSILON) &&
(ABSOLUTE(temp_ptr->ka - ka) < EPSILON) &&
(ABSOLUTE(temp_ptr->kd - kd) < EPSILON) &&
(ABSOLUTE(temp_ptr->ks - ks) < EPSILON) &&
(ABSOLUTE(temp_ptr->ks_spec - ks_spec) < EPSILON) &&
(ABSOLUTE(temp_ptr->ang - ang) < EPSILON) &&
(ABSOLUTE(temp_ptr->kt - kt) < EPSILON) &&
(ABSOLUTE(temp_ptr->ior - i_of_r) < EPSILON))
return (temp_ptr->surf_index);
else
temp_ptr = temp_ptr->next;
return (0);
}
/*-----------------------------------------------------------------*/
/*
* Output color and shading parameters for all following objects
*
* For POV-Ray and Polyray, a character string will be returned that
* identified this texture. The default texture will be updated with
* the name generated by this function.
*
* Meaning of the color and shading parameters:
* name = name that this surface can be referenced by...
* color = surface color
* ka = ambient component
* kd = diffuse component
* ks = amount contributed from the reflected direction
* ks_spec = contribution from specular highlights (vs. reflection)
* ang = half angle, in degrees, at which specular highlight
* drops to 50% strength
* t = amount contributed from the refracted direction
* i_of_r = index of refraction of the surface
*
*/
#ifdef ANSI_FN_DEF
char * lib_output_color (char *name, COORD3 color, double ka,
double kd, double ks, double ks_spec,
double ang, double kt, double i_of_r)
#else
char * lib_output_color(name, color, ka, kd, ks, ks_spec, ang, kt, i_of_r)
char *name;
COORD3 color;
double ka, kd, ks, ks_spec, ang, kt, i_of_r;
#endif
{
surface_ptr new_surf;
char *txname = NULL;
int txindex = 0;
double phong_pow, ang_radians;
/* Increment the number of surface types we know about */
gTexture_count = ++gTexture_max_count; /* [sbt] N.B. reversed below if we
find in cache. */
gTexture_ior = i_of_r;
/* Calculate the Phong coefficient */
ang_radians = PI * ang / 180.0;