From 4e2a6e40a77068492e3b63b84a18d0cc7f003fb7 Mon Sep 17 00:00:00 2001 From: Tavian Barnes Date: Wed, 6 Jan 2010 13:43:14 -0500 Subject: Split up objects, finishes, pigments, lights, cameras, etc. --- libdimension/objects.c | 211 ------------------------------------------------- 1 file changed, 211 deletions(-) delete mode 100644 libdimension/objects.c (limited to 'libdimension/objects.c') diff --git a/libdimension/objects.c b/libdimension/objects.c deleted file mode 100644 index 3470506..0000000 --- a/libdimension/objects.c +++ /dev/null @@ -1,211 +0,0 @@ -/************************************************************************* - * Copyright (C) 2009 Tavian Barnes * - * * - * This file is part of The Dimension Library. * - * * - * The Dimension Library is free software; you can redistribute it and/ * - * or modify it under the terms of the GNU Lesser General Public License * - * as published by the Free Software Foundation; either version 3 of the * - * License, or (at your option) any later version. * - * * - * The Dimension Library is distributed in the hope that it will be * - * useful, but WITHOUT ANY WARRANTY; without even the implied warranty * - * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * - * Lesser General Public License for more details. * - * * - * You should have received a copy of the GNU Lesser General Public * - * License along with this program. If not, see * - * . * - *************************************************************************/ - -#include "dimension.h" -#include /* For malloc */ -#include /* For sqrt */ - -/* - * Sphere - */ - -/* Sphere object callbacks */ - -static dmnsn_intersection * -dmnsn_sphere_intersection_fn(const dmnsn_object *sphere, dmnsn_line line); - -static int dmnsn_sphere_inside_fn(const dmnsn_object *sphere, - dmnsn_vector point); - -/* Allocate a new sphere */ -dmnsn_object * -dmnsn_new_sphere() -{ - dmnsn_object *sphere = dmnsn_new_object(); - if (sphere) { - sphere->intersection_fn = &dmnsn_sphere_intersection_fn; - sphere->inside_fn = &dmnsn_sphere_inside_fn; - sphere->min = dmnsn_new_vector(-1.0, -1.0, -1.0); - sphere->max = dmnsn_new_vector(1.0, 1.0, 1.0); - } - return sphere; -} - -/* Returns the closest intersection of `line' with `sphere' */ -static dmnsn_intersection * -dmnsn_sphere_intersection_fn(const dmnsn_object *sphere, dmnsn_line line) -{ - double a, b, c, t; - dmnsn_intersection *intersection = NULL; - - /* Solve (x0 + nx*t)^2 + (y0 + ny*t)^2 + (z0 + nz*t)^2 == 1 */ - - a = line.n.x*line.n.x + line.n.y*line.n.y + line.n.z*line.n.z; - b = 2.0*(line.n.x*line.x0.x + line.n.y*line.x0.y + line.n.z*line.x0.z); - c = line.x0.x*line.x0.x + line.x0.y*line.x0.y + line.x0.z*line.x0.z - 1.0; - - if (b*b - 4.0*a*c >= 0) { - t = (-b - sqrt(b*b - 4.0*a*c))/(2*a); - if (t < 0.0) { - t = (-b + sqrt(b*b - 4.0*a*c))/(2*a); - } - - if (t >= 0.0) { - intersection = dmnsn_new_intersection(); - intersection->ray = line; - intersection->t = t; - intersection->normal = dmnsn_line_point(line, t); - intersection->texture = sphere->texture; - - /* Flip the normal if we're inside the sphere */ - if (dmnsn_vector_dot(line.n, intersection->normal) > 0.0) - intersection->normal = dmnsn_vector_negate(intersection->normal); - } - } - - return intersection; -} - -/* Return whether a point is inside a sphere (x**2 + y**2 + z**2 < 1.0) */ -static int -dmnsn_sphere_inside_fn(const dmnsn_object *sphere, dmnsn_vector point) -{ - return point.x*point.x + point.y*point.y + point.z*point.z < 1.0; -} - -/* - * Cube - */ - -/* Cube callbacks */ -static dmnsn_intersection *dmnsn_cube_intersection_fn(const dmnsn_object *cube, - dmnsn_line line); -static int dmnsn_cube_inside_fn(const dmnsn_object *cube, - dmnsn_vector point); - -/* Allocate a new cube object */ -dmnsn_object * -dmnsn_new_cube() -{ - dmnsn_object *cube = dmnsn_new_object(); - if (cube) { - cube->intersection_fn = &dmnsn_cube_intersection_fn; - cube->inside_fn = &dmnsn_cube_inside_fn; - cube->min = dmnsn_new_vector(-1.0, -1.0, -1.0); - cube->max = dmnsn_new_vector(1.0, 1.0, 1.0); - } - return cube; -} - -/* Intersections callback for a cube */ -static dmnsn_intersection * -dmnsn_cube_intersection_fn(const dmnsn_object *cube, dmnsn_line line) -{ - double t = -1.0, t_temp; - dmnsn_vector p, normal; - dmnsn_intersection *intersection = NULL; - - /* Six ray-plane intersection tests (x, y, z) = +/- 1.0 */ - - if (line.n.x != 0.0) { - /* x = -1.0 */ - t_temp = (-1.0 - line.x0.x)/line.n.x; - p = dmnsn_line_point(line, t_temp); - if (p.y >= -1.0 && p.y <= 1.0 && p.z >= -1.0 && p.z <= 1.0 - && t_temp >= 0.0 && (t < 0.0 || t_temp < t)) - { - t = t_temp; - normal = dmnsn_new_vector(-copysign(1.0, line.n.x), 0.0, 0.0); - } - - /* x = 1.0 */ - t_temp = (1.0 - line.x0.x)/line.n.x; - p = dmnsn_line_point(line, t_temp); - if (p.y >= -1.0 && p.y <= 1.0 && p.z >= -1.0 && p.z <= 1.0 - && t_temp >= 0.0 && (t < 0.0 || t_temp < t)) - { - t = t_temp; - normal = dmnsn_new_vector(-copysign(1.0, line.n.x), 0.0, 0.0); - } - } - - if (line.n.y != 0.0) { - /* y = -1.0 */ - t_temp = (-1.0 - line.x0.y)/line.n.y; - p = dmnsn_line_point(line, t_temp); - if (p.x >= -1.0 && p.x <= 1.0 && p.z >= -1.0 && p.z <= 1.0 - && t_temp >= 0.0 && (t < 0.0 || t_temp < t)) - { - t = t_temp; - normal = dmnsn_new_vector(0.0, -copysign(1.0, line.n.y), 0.0); - } - - /* y = 1.0 */ - t_temp = (1.0 - line.x0.y)/line.n.y; - p = dmnsn_line_point(line, t_temp); - if (p.x >= -1.0 && p.x <= 1.0 && p.z >= -1.0 && p.z <= 1.0 - && t_temp >= 0.0 && (t < 0.0 || t_temp < t)) - { - t = t_temp; - normal = dmnsn_new_vector(0.0, -copysign(1.0, line.n.y), 0.0); - } - } - - if (line.n.z != 0.0) { - /* z = -1.0 */ - t_temp = (-1.0 - line.x0.z)/line.n.z; - p = dmnsn_line_point(line, t_temp); - if (p.x >= -1.0 && p.x <= 1.0 && p.y >= -1.0 && p.y <= 1.0 - && t_temp >= 0.0 && (t < 0.0 || t_temp < t)) - { - t = t_temp; - normal = dmnsn_new_vector(0.0, 0.0, -copysign(1.0, line.n.z)); - } - - /* z = 1.0 */ - t_temp = (1.0 - line.x0.z)/line.n.z; - p = dmnsn_line_point(line, t_temp); - if (p.x >= -1.0 && p.x <= 1.0 && p.y >= -1.0 && p.y <= 1.0 - && t_temp >= 0.0 && (t < 0.0 || t_temp < t)) - { - t = t_temp; - normal = dmnsn_new_vector(0.0, 0.0, -copysign(1.0, line.n.z)); - } - } - - if (t >= 0.0) { - intersection = dmnsn_new_intersection(); - intersection->ray = line; - intersection->t = t; - intersection->normal = normal; - intersection->texture = cube->texture; - } - - return intersection; -} - -/* Inside callback for a cube */ -static int -dmnsn_cube_inside_fn(const dmnsn_object *cube, dmnsn_vector point) -{ - return point.x > -1.0 && point.x < 1.0 - && point.y > -1.0 && point.y < 1.0 - && point.z > -1.0 && point.z < 1.0; -} -- cgit v1.2.3