matrix_4x4 m44_view_look_at(vector3 position, vector3 target, vector3 up) {
/*
Taken From:
http://www.opengl.org/wiki/GluLookAt_code
*/
vector3 zaxis = v3_normalize( v3_sub(target, position) );
vector3 xaxis = v3_normalize( v3_cross(up, zaxis) );
vector3 yaxis = v3_cross(zaxis, xaxis);
matrix_4x4 view_matrix = m44_id();
view_matrix.xx = xaxis.x;
view_matrix.xy = xaxis.y;
view_matrix.xz = xaxis.z;
view_matrix.yx = yaxis.x;
view_matrix.yy = yaxis.y;
view_matrix.yz = yaxis.z;
view_matrix.zx = -zaxis.x;
view_matrix.zy = -zaxis.y;
view_matrix.zz = -zaxis.z;
// Also unsure of this.
view_matrix = m44_mul_m44(view_matrix, m44_translation(v3_neg(position)) );
return view_matrix;
}
mat4_t mat4_look_at(v3_t eye, v3_t center, v3_t up) {
v3_t fwd = { center.x - eye.x, center.y - eye.y, center.z - eye.z };
fwd = v3_normalize(fwd);
v3_t right = v3_normalize(v3_cross(fwd, up));
up = v3_normalize(v3_cross(right, fwd));
mat4_t v;
v.m11 = right.x;
v.m12 = right.y;
v.m13 = right.z;
v.m14 = -v3_scalar(right, eye);
v.m21 = up.x;
v.m22 = up.y;
v.m23 = up.z;
v.m24 = -v3_scalar(up, eye);
v.m31 = -fwd.x;
v.m32 = -fwd.y;
v.m33 = -fwd.z;
v.m34 = v3_scalar(fwd, eye);
v.m41 = 0.f;
v.m42 = 0.f;
v.m43 = 0.f;
v.m44 = 1.f;
return v;
}
int
triangle_intersects(const triangle_t *triangle, const ray_t *ray, intersection_t *result)
{
const v3_t* edge1;
const v3_t* edge2;
v3_t tvec;
v3_t pvec;
v3_t qvec;
float det;
float inv_det;
float t;
float u;
float v;
result->hit = 0;
//v3_sub(&edge1, &triangle->pt2, &triangle->pt1);
//v3_sub(&edge2, &triangle->pt3, &triangle->pt1);
edge1 = &triangle->edge1;
edge2 = &triangle->edge2;
v3_cross(&pvec, &ray->direction, edge2);
det = v3_dot(edge1, &pvec);
//No culling version
if(det > -EPSILON && det < EPSILON)
return 0;
inv_det = 1.0f / det;
v3_sub(&tvec, &ray->origin, &triangle->v0);
u = v3_dot(&tvec, &pvec) * inv_det;
if(u < 0.0f || u > 1.0f)
return 0;
v3_cross(&qvec, &tvec, edge1);
v = v3_dot(&ray->direction, &qvec) * inv_det;
if(v < 0.0f || u + v > 1.0f + EPSILON) //add EPSILON to offset small precision errors
return 0;
t = v3_dot(edge2, &qvec) * inv_det;
if(t > EPSILON) {
result->hit = 1;
result->distance = t;
return 1;
}
/*
v3_copy(&result->normal, &triangle->normal);
v3_copy(&result->hit_point, &r->direction);
v3_mul_scalar(&result->hit_point, t);
v3_add(&result->hit_point, &result->hit_point, &r->origin);
*/
return 0;
}
t_mat4 m4_look_at(t_vec3 from, t_vec3 to, t_vec3 up)
{
t_vec3 x;
t_vec3 y;
t_vec3 z;
z = v3_muls(v3_norm(v3_sub(to, from)), -1);
x = v3_norm(v3_cross(up, z));
y = v3_cross(z, x);
return (mat4(
x.x, x.y, x.z, -v3_dot(from, x),
y.x, y.y, y.z, -v3_dot(from, y),
z.x, z.y, z.z, -v3_dot(from, z),
0, 0, 0, 1
));
}
Color bump_map(void *info, Vector3 t, Vector3 n, Vector3 ds, Vector3 dt)
{
TextureSrc *src = info;
Real h = 0.0005;
Real fo = texture_c1((*src->texfunc)(src->texdata, t));
Real fu = texture_c1((*src->texfunc)(src->texdata, v3_add(t,v3_make(h,0,0))));
Real fv = texture_c1((*src->texfunc)(src->texdata, v3_add(t,v3_make(0,h,0))));
Real du = fderiv(fo, fu, h);
Real dv = fderiv(fo, fv, h);
Vector3 u = v3_scale(du, v3_cross(n, dt));
Vector3 v = v3_scale(-dv, v3_cross(n, ds));
return v3_add(u, v);
}
void
triangle_update(triangle_t* triangle)
{
v3_sub(&triangle->edge1, &triangle->v1, &triangle->v0);
v3_sub(&triangle->edge2, &triangle->v2, &triangle->v0);
v3_cross(&triangle->normal, &triangle->edge1, &triangle->edge2);
v3_normalize(&triangle->normal);
}
void scotland_update() {
camera* cam = entity_get("camera");
light* sun = entity_get("sun");
static_object* skydome = entity_get("skydome");
landscape* world = entity_get("world");
sun_orbit += frame_time() * 0.01;
sun->position.x = 512 + sin(sun_orbit) * 512;
sun->position.y = cos(sun_orbit) * 512;
sun->position.z = 512;
sun->target = v3(512, 0, 512);
if (w_held || s_held) {
vector3 cam_dir = v3_normalize(v3_sub(cam->target, cam->position));
float speed = 0.5;
if (!freecam) speed = 0.05;
if (w_held) {
cam->position = v3_add(cam->position, v3_mul(cam_dir, speed));
}
if (s_held) {
cam->position = v3_sub(cam->position, v3_mul(cam_dir, speed));
}
if (!freecam) {
float height = terrain_height(world->terrain, v2(cam->position.x, cam->position.z));
cam->position.y = height + 1;
}
cam->target = v3_add(cam->position, cam_dir);
}
Uint8 keystate = SDL_GetMouseState(NULL, NULL);
if(keystate & SDL_BUTTON(1)){
float a1 = -(float)mouse_x * 0.005;
float a2 = (float)mouse_y * 0.005;
vector3 cam_dir = v3_normalize(v3_sub(cam->target, cam->position));
cam_dir.y += -a2;
vector3 side_dir = v3_normalize(v3_cross(cam_dir, v3(0,1,0)));
cam_dir = v3_add(cam_dir, v3_mul(side_dir, -a1));
cam_dir = v3_normalize(cam_dir);
cam->target = v3_add(cam->position, cam_dir);
}
mouse_x = 0;
mouse_y = 0;
ui_button* framerate = ui_elem_get("framerate");
ui_button_set_label(framerate, frame_rate_string());
}
void makeviewVi(void)
{
Vector3 n,u,v,t;
n = view->normal;
v = v3_sub(view->up, v3_scale(v3_dot(view->up, n), n));
if (v3_norm(v) < ROUNDOFF)
error("view up parallel to view normal");
v = v3_unit(v);
u = v3_cross(n, v);
v = v3_cross(u, n);
n = v3_scale(-1.0, n);
t = view->center;
view->Vinv = m4_ident();
view->Vinv.r1.x = u.x; view->Vinv.r2.x = u.y; view->Vinv.r3.x = u.z;
view->Vinv.r1.y = v.x; view->Vinv.r2.y = v.y; view->Vinv.r3.y = v.z;
view->Vinv.r1.z = n.x; view->Vinv.r2.z = n.y; view->Vinv.r3.z = n.z;
view->Vinv.r1.w = t.x; view->Vinv.r2.w = t.y; view->Vinv.r3.w = t.z;
}
void sea_update() {
camera* cam = entity_get("camera");
light* sun = entity_get("sun");
wave_time += frame_time();
static_object* corvette = entity_get("corvette");
corvette->position.y = (sin(wave_time) + 1) / 2;
corvette->rotation = v4_quaternion_pitch(sin(wave_time * 1.123) / 50);
corvette->rotation = v4_quaternion_mul(corvette->rotation, v4_quaternion_yaw(sin(wave_time * 1.254) / 25));
corvette->rotation = v4_quaternion_mul(corvette->rotation, v4_quaternion_roll(sin(wave_time * 1.355) / 100));
static_object* center_sphere = entity_get("center_sphere");
physics_object* balls[100];
int num_balls;
entities_get(balls, &num_balls, physics_object);
for(int i = 0; i < num_balls; i++) {
physics_object_collide_static(balls[i], center_sphere, frame_time());
physics_object_collide_static(balls[i], corvette, frame_time());
physics_object_update(balls[i], frame_time());
}
Uint8 keystate = SDL_GetMouseState(NULL, NULL);
if(keystate & SDL_BUTTON(1)) {
float a1 = -(float)mouse_x * 0.01;
float a2 = (float)mouse_y * 0.01;
cam->position = v3_sub(cam->position, cam->target);
cam->position = m33_mul_v3(m33_rotation_y( a1 ), cam->position );
cam->position = v3_add(cam->position, cam->target);
cam->position = v3_sub(cam->position, cam->target);
vector3 rotation_axis = v3_normalize(v3_cross( v3_sub(cam->position, v3_zero()) , v3(0,1,0) ));
cam->position = m33_mul_v3(m33_rotation_axis_angle(rotation_axis, a2 ), cam->position );
cam->position = v3_add(cam->position, cam->target);
}
if(keystate & SDL_BUTTON(3)) {
sun->position.x += (float)mouse_y / 2;
sun->position.z -= (float)mouse_x / 2;
}
mouse_x = 0;
mouse_y = 0;
ui_button* framerate = ui_elem_get("framerate");
ui_button_set_label(framerate, frame_rate_string());
}
void metaballs_update() {
camera* cam = entity_get("camera");
light* sun = entity_get("sun");
Uint8 keystate = SDL_GetMouseState(NULL, NULL);
if(keystate & SDL_BUTTON(1)){
float a1 = -(float)mouse_x * frame_time() * 0.25;
float a2 = (float)mouse_y * frame_time() * 0.25;
cam->position = v3_sub(cam->position, cam->target);
cam->position = m33_mul_v3(m33_rotation_y( a1 ), cam->position );
cam->position = v3_add(cam->position, cam->target);
cam->position = v3_sub(cam->position, cam->target);
vector3 rotation_axis = v3_normalize(v3_cross( v3_sub(cam->position, v3_zero()) , v3(0,1,0) ));
cam->position = m33_mul_v3(m33_rotation_axis_angle(rotation_axis, a2 ), cam->position );
cam->position = v3_add(cam->position, cam->target);
}
if(keystate & SDL_BUTTON(3)){
sun->position.x += (float)mouse_y / 2;
sun->position.z -= (float)mouse_x / 2;
}
mouse_x = 0;
mouse_y = 0;
particles_update(frame_time());
ui_button* framerate = ui_elem_get("framerate");
ui_button_set_label(framerate, frame_rate_string());
#ifdef MARCHING_CUBES
marching_cubes_metaball_data( particle_positions_memory(), particles_count() );
marching_cubes_clear();
marching_cubes_update();
#endif
#ifdef VOLUME_RENDERER
volume_renderer_metaball_data( particle_positions_memory(), particles_count() );
volume_renderer_update();
#endif
}
/* Returns true if the image becomes disconnected under the given
* homography */
int img_disconnected_under_homography(img_t *img, double *H) {
/* Check if any point in the img maps to infinity under H. This
* is true for p if Hp = [x y 0], so if w is the third row of H,
* w^T * p = 0. We check if this line intersects the image */
v2_t origin = img->origin;
int w = img->w, h = img->h;
v3_t line = v3_new(H[6], H[7], H[8]);
/* The bottom line is where y = Vy(origin) */
v3_t bottom_line = v3_cross(v3_new(0.0, Vy(origin), 1.0),
v3_new(1.0, Vy(origin), 1.0));
v3_t top_line = v3_cross(v3_new(0.0, Vy(origin) + h - 1, 1.0),
v3_new(1.0, Vy(origin) + h - 1, 1.0));
v3_t left_line = v3_cross(v3_new(Vx(origin), 0.0, 1.0),
v3_new(Vx(origin), 1.0, 1.0));
v3_t right_line = v3_cross(v3_new(Vx(origin) + w - 1, 0.0, 1.0),
v3_new(Vx(origin) + w - 1, 1.0, 1.0));
v3_t isect;
/* Do four intersection tests */
isect = v3_homogenize(v3_cross(line, bottom_line));
if (Vx(isect) > 0 && Vx(isect) < w - 1)
return 1;
isect = v3_homogenize(v3_cross(line, top_line));
if (Vx(isect) > 0 && Vx(isect) < w - 1)
return 1;
isect = v3_homogenize(v3_cross(line, left_line));
if (Vy(isect) > 0 && Vy(isect) < h - 1)
return 1;
isect = v3_homogenize(v3_cross(line, right_line));
if (Vy(isect) > 0 && Vy(isect) < h - 1)
return 1;
return 0;
}
void display_generate_line(int subDiv, t_v3* min, t_v3* max, float sphere_radius, uint8* vb, t_mesh_definition* def, uint16* ib, uint16 start)
{
t_v3 direction;
t_v3 normal;
v3_set(&normal, 0, 0, 1);
v3_sub(max, min, &direction);
v3_norm(&direction, &direction);
v3_cross(&direction, &normal, &normal);
normal.x *= sphere_radius;
normal.y *= sphere_radius;
normal.z *= sphere_radius;
float vs[] = {
min->x - normal.x, min->y - normal.y, min->z,
min->x + normal.x, min->y + normal.y, min->z,
max->x - normal.x, max->y - normal.y, max->z,
max->x + normal.x, max->y + normal.y, max->z,
};
float* vsp = vs;
int32 i;
for (i = 0; i < 4; ++i)
{
t_v3* v = (t_v3*)(vb + def->vertex_offset);
t_v3* n = (t_v3*)(vb + def->normal_offset);
v3_set(v, *vsp, *(vsp + 1), *(vsp + 2));
vsp += 3;
if (def->normal_offset != -1)
v3_set(n, 0.0f, 0.0f, 1.0f);
vb += def->stride;
}
*ib++ = start + 0;
*ib++ = start + 1;
*ib++ = start + 3;
*ib++ = start + 0;
*ib++ = start + 3;
*ib++ = start + 2;
}
//Computes the angular momentum about the general center of mass
void Computation::computeAngularMomentum() {
double translation[3], rotation[3];
double R[4][4],Rx[4][4],Ry[4][4],Rz[4][4];
double mean_w[3];
Bone * root;
Mass * mass;
if(m_pSkeletonList != NULL)
{
for (int i = 0; i < numOfSkeletons && i < MAX_SKELS; i++)
{
double transform[4][4];
identity(transform);
double r_i_cm[m_pSkeletonList[i]->NUM_BONES_IN_ASF_FILE][3]; //stores previous position of local center of mass in global cs
root = m_pSkeletonList[i]->getRoot();
if(m_pMassDistributionList[i] != NULL) {
//reset angular momentum
m_pSkeletonList[i]->H[0] = 0.;
m_pSkeletonList[i]->H[1] = 0.;
m_pSkeletonList[i]->H[2] = 0.;
//store old local cm in global cs of each bone:
for( int k = 0; k < m_pSkeletonList[i]->NUM_BONES_IN_ASF_FILE; k++)
{
//store previous position of local cm in global cs in r_i_cm
r_i_cm[k][0] = m_pSkeletonList[i]->getBone(root, k)->r_i[0];
r_i_cm[k][1] = m_pSkeletonList[i]->getBone(root, k)->r_i[1];
r_i_cm[k][2] = m_pSkeletonList[i]->getBone(root, k)->r_i[2];
}
//compute current position of lcm in global cs
m_pSkeletonList[i]->GetTranslation(translation);
m_pSkeletonList[i]->GetRotationAngle(rotation);
//creating Rotation matrix for initial rotation of Skeleton
rotationX(Rx, rotation[0]);
rotationY(Ry, rotation[1]);
rotationZ(Rz, rotation[2]);
matrix4_mult(Rz, Ry, R);
matrix4_mult(R, Rx, R);
matrix4_mult(transform, R, transform);
transform[0][3] += (MOCAP_SCALE*translation [0]);
transform[1][3] += (MOCAP_SCALE*translation [1]);
transform[2][3] += (MOCAP_SCALE*translation [2]);
traverse(root, i, transform, 'h');
//TODO delete
mean_w[0] = 0;
mean_w[1] = 0;
mean_w[2] = 0;
for(int j = 0; j < m_pSkeletonList[i]->NUM_BONES_IN_ASF_FILE; j++) { //for every bone compute: (r_i - r_cm) x m_i(v_i - v_cm) + I_i*w_i
double rel_pos[3], v_i[3], v_cm[3], v_rel[3], I_G[3][3], w_i[3], local_inertia[3], cross[3], S[3][3], S_transpose[3][3];
Bone * bone;
bone = m_pSkeletonList[i]->getBone(root, j);
if(m_pMassDistributionList[i]->getMass(bone->name) != NULL) {
mass = m_pMassDistributionList[i]->getMass(bone->name);
//rel_pos = r_i - r_cm
rel_pos[0] = bone->r_i[0] - m_pSkeletonList[i]->cm[0];
rel_pos[1] = bone->r_i[1] - m_pSkeletonList[i]->cm[1];
rel_pos[2] = bone->r_i[2] - m_pSkeletonList[i]->cm[2];
//v_i = r_i - r_i_cm
v_i[0] = (bone->r_i[0] - r_i_cm[j][0]);
v_i[1] = (bone->r_i[1] - r_i_cm[j][1]);
v_i[2] = (bone->r_i[2] - r_i_cm[j][2]);
//if v_i is zero switch flag
checkLegSwing(v_i, bone, i);
// if(mass->mass != 0 && ((strcmp(mass->segName, "rfoot") == 0) || (strcmp(mass->segName, "lfoot") == 0))) printf("v_i_%s: %f %f %f\n",mass->segName, v_i[0], v_i[1], v_i[2]);
//v_cm = r_cm - r_cm_prev
v_cm[0] = (m_pSkeletonList[i]->cm[0] - m_pSkeletonList[i]->cm_prev[0]);
v_cm[1] = (m_pSkeletonList[i]->cm[1] - m_pSkeletonList[i]->cm_prev[1]);
v_cm[2] = (m_pSkeletonList[i]->cm[2] - m_pSkeletonList[i]->cm_prev[2]);
//v_rel = v_i - v_cm
v_rel[0] = v_i[0] - v_cm[0];
v_rel[1] = v_i[1] - v_cm[1];
v_rel[2] = v_i[2] - v_cm[2];
//Inertia tensor
double Ri[4][4], Ri_transpose[4][4], I_i[4][4];
//rotation from global to local
rotationX(Rx, -bone->axis_x);
rotationY(Ry, -bone->axis_y);
rotationZ(Rz, -bone->axis_z);
matrix4_mult(Rz, Ry, Ri);
matrix4_mult(Ri, Rx, Ri);
matrix4_transpose(Ri, Ri_transpose);
I_i[0][0] = mass->Ixx;
I_i[0][1] = I_i[1][0] =(-1)*mass->Ixy;
I_i[0][2] = I_i[2][0] = (-1)*mass->Ixz;
I_i[1][1] = mass->Iyy;
I_i[1][2] = I_i[2][1] = (-1)*mass->Iyz;
I_i[2][2] = mass->Izz;
I_i[0][3] = I_i[1][3] = I_i[2][3] = 0;
I_i[3][0] = I_i[3][1] = I_i[3][2] = 0;
I_i[3][3] = 1.0;
//~I_G = R_i^T * I_i * R_i
//~I_G is inertia tensor relative to bone's cm in rotation of global cs.
matrix4_mult(Ri_transpose, I_i, I_i);
matrix4_mult(I_i, Ri, I_i);
//parallel axes theorem
// I_G = I_i + m_i * S^T(rel_pos)* S(rel_pos) with S is skew matrix for cross product
cross_matrix(rel_pos, S); //works
matrix3_transpose(S, S_transpose);//works
matrix3_mult(S_transpose, S, S); //works
matrix3_scalar_mult(S, mass->mass); //works
//copy entries into I_G
identity3(I_G);
for (int x = 0; x < 3; x++)
for (int y = 0; y < 3; y++)
I_G[x][y] = I_i[x][y] + S[x][y];
//w_i = R_i^T * ({rx,ry,rz} - {rx_prev, ry_prev, rz_prev});
w_i[0] = (bone->rx - bone->rx_prev);
w_i[1] = (bone->ry - bone->ry_prev);
w_i[2] = (bone->rz - bone->rz_prev);
//clamping
if(absolute_value(w_i[0]) > 1.5) w_i[0] = 0;
if(absolute_value(w_i[1]) > 1.5) w_i[1] = 0;
if(absolute_value(w_i[2]) > 1.5) w_i[2] = 0;
mean_w[0] += absolute_value(w_i[0]);
mean_w[1] += absolute_value(w_i[1]);
mean_w[2] += absolute_value(w_i[2]);
vector_rotationXYZ(w_i, bone->axis_x, bone->axis_y, bone->axis_z);
//local_inertia = I_i*w_i
matrix3_v3_mult(I_G,w_i, local_inertia);
//cross = (r_i - r_cm) x m_i(v_i - v_cm)
v_rel[0] *= m_pMassDistributionList[i]->getMass(bone->name)->mass;
v_rel[1] *= m_pMassDistributionList[i]->getMass(bone->name)->mass;
v_rel[2] *= m_pMassDistributionList[i]->getMass(bone->name)->mass;
v3_cross(rel_pos, v_rel, cross);
//H is sum of angular momentum of every bone
m_pSkeletonList[i]->H[0] += (cross[0] + local_inertia[0]);
m_pSkeletonList[i]->H[1] += (cross[1] + local_inertia[1]);
m_pSkeletonList[i]->H[2] += (cross[2] + local_inertia[2]);
} //if end
}//for bones end
setLegSwing(i);
mean_w[0] /= m_pSkeletonList[i]->NUM_BONES_IN_ASF_FILE;
mean_w[1] /= m_pSkeletonList[i]->NUM_BONES_IN_ASF_FILE;
mean_w[2] /= m_pSkeletonList[i]->NUM_BONES_IN_ASF_FILE;
//normalization N=M*H*V
// to make H dimensionless, divide by subject's height (in m), subject's mass (in kg) and subject's average velocity(0.012 m/frame or 1.44 m/s)
double n = m_pSkeletonList[i]->totalMass*m_pSkeletonList[i]->height*(1.44);
m_pSkeletonList[i]->H[0] /= n;
m_pSkeletonList[i]->H[1] /= n;
m_pSkeletonList[i]->H[2] /= n;
//printf("mean w values: %f %f %f\n", mean_w[0], mean_w[1], mean_w[2]);
//printf("angular momentum: %f %f %f\n", m_pSkeletonList[i]->H[0],m_pSkeletonList[i]->H[1],m_pSkeletonList[i]->H[2]);
//printf("position cm: %f %f %f\n", m_pSkeletonList[i]->cm[0], m_pSkeletonList[i]->cm[1], m_pSkeletonList[i]->cm[2]);
}//if end
}// for Skeletons end
}
}
/* M A I N */
int main(int argc, char *argv[])
{
FILE *starfile;
FILE *posnfile;
double lat, lon;
struct star_rec_str star_rec;
/* time, UTC */
struct ymdhms tstar = {PLOTYEAR, PLOTMONTH, PLOTDAY,
PLOTHOUR, PLOTMINUTE, PLOTSECOND};
struct starData stardat;
double east, north;
struct v3_str p0x, p0y;
/* vector normal to ceiling */
struct v3_str n;
/* compute normal to ceiling */
p0x = px;
v3_sub(&p0x, &p0);
p0y = py;
v3_sub(&p0y, &p0);
n = p0x;
v3_cross(&n, &p0y);
/* read in latitude, longitude */
posnfile = fopen(POSNFILE, "r");
if (posnfile != NULL) {
if (read_latlon(posnfile, &lat, &lon) != 0) {
lat = DFLT_LAT;
lon = DFLT_LON;
}
fclose(posnfile);
} else {
lat = DFLT_LAT;
lon = DFLT_LON;
}
#if 1
printf("lat: %f, lon: %f\n", lat, lon);
#endif
starfile = fopen(STARFILE, "r");
while (read_star(starfile, &star_rec) != -1) {
/* dn is anchored in ne corner, ds in se corner */
/*
* dn is wall measurement using NE anchor point
* ds is wall measurement using SE anchor point
* N, S walls measured from east side
* W wall measured from S side _from_both_anchors_
*/
double dn, ds;
char wn, ws; /* wall on which line terminates */
double bri; /* brightness of dot (relative to mag 0) */
double dia; /* diameter of dot */
double dist; /* observer to dot distance */
/* unit vector in direction of star, spherical coords */
struct crd_sph_str u_sph;
struct v3_str u_crt; /* same in cartesian coords */
/* calculate altitude, azimuth */
/*
* note: these calculations don't quite agree with stellarium's.
* I suspect it's due to "RA/DE (of date)" calculation
* (proper motion)
*/
ephStarPos(&tstar, lat, lon, star_rec.ra, star_rec.dec,
&stardat);
#if 0
//printf("\nStar %d:\n", star_rec.hip);
//ephStarDump(&stardat);
printf("%d,%10.6f,%10.6f\n", star_rec.hip, stardat.az, stardat.alt);
#endif
/* create unit vector in direction of star */
u_sph.r = 1.0;
u_sph.phi = ephDegToRad(ephAltToPhi(stardat.alt));
u_sph.theta = ephDegToRad(ephAzToTheta(stardat.az));
crd_sph2cart(&u_sph, &u_crt);
/* distance from origin to dot */
dist = v3_dist_line_plane(&origin, &u_crt, &p0, &n);
/* CLEANED UP TO HERE */
/* skip stars too low (or below horizon) */
if (stardat.alt < ALT_MIN)
continue;
/*
* convert to cartesian coords:
* observer is OBS_TO_CEIL below ceiling
* OBS_TO_WALL from middle of east wall
*/
east = OBS_TO_CEIL * ephSin(stardat.az) / ephTan(stardat.alt);
north = OBS_TO_CEIL * ephCos(stardat.az) / ephTan(stardat.alt);
east -= OBS_TO_WALL;
/* skip those not on ceiling */
if ((north > ROOM_NS / 2.0) || (north < -ROOM_NS / 2.0)
|| (east > 0) || (east < -ROOM_EW))
continue;
#if 0
printf("%d %6.1f %6.1f %5.2f\n", star_rec.hip,
east, north, star_rec.vmag);
#endif
if (-east / (ROOM_NS / 2.0 - north) <= ROOM_EW / ROOM_NS) {
dn = -east * ROOM_NS / (ROOM_NS / 2.0 - north);
wn = 's';
} else {
dn = ROOM_NS - ROOM_EW * (ROOM_NS / 2.0 - north) / -east;
wn = 'W';
}
if (-east / (ROOM_NS / 2.0 + north) <= ROOM_EW / ROOM_NS) {
ds = -east * ROOM_NS / (ROOM_NS / 2.0 + north);
ws = 'n';
} else {
ds = ROOM_EW * (ROOM_NS / 2.0 + north) / -east;
ws = 'W';
}
/* brightness ratio, relative to mag 0: m = -2.5log_10(F/F0) */
/* this could be more accurate: 5th root of 100 */
/* see Wikipedia: apparent magnitude */
bri = pow(10.0, star_rec.vmag / -2.5);
/* compensate for distance from observer to dot */
bri *= dist * dist / (OBS_TO_CEIL * OBS_TO_CEIL);
/* compensate for view angle */
bri /= ephSin(stardat.alt);
/* brightness proportional to square of diameter */
dia = DIA_0 * sqrt(bri);
#if 1
printf("%6d %5.2f %010.6f %09.6f %6.1f %6.1f %05.1f %c %05.1f %c %4.1f 0\n",
star_rec.hip, star_rec.vmag,
stardat.az, stardat.alt,
east, north,
dn, wn, ds, ws, dia);
#endif
}
fclose(starfile);
exit(0);
}
void GLWidget::keyPressEvent(QKeyEvent *event)
{
Matrix4 M;
Vector3 Dir;
switch (event->key()) {
case Qt::Key_Q:
case Qt::Key_A:
M = m4_rotate('y', 0.5);
scene->view->center = v3_m4mult(scene->view->center,M);
scene->view->normal = v3_m4mult(scene->view->normal,M);
makeviewV();
setview(scene->view);
break;
case Qt::Key_D:
M = m4_rotate('y', -0.5);
scene->view->center = v3_m4mult(scene->view->center,M);
scene->view->normal = v3_m4mult(scene->view->normal,M);
makeviewV();
setview(scene->view);
break;
case Qt::Key_W:
M = m4_rotate('x', 0.5);
scene->view->center = v3_m4mult(scene->view->center,M);
scene->view->up = v3_m4mult(scene->view->up,M);
scene->view->normal = v3_m4mult(scene->view->normal,M);
makeviewV();
setview(scene->view);
break;
case Qt::Key_S:
M = m4_rotate('x', -0.5);
scene->view->center = v3_m4mult(scene->view->center,M);
scene->view->up = v3_m4mult(scene->view->up,M);
scene->view->normal = v3_m4mult(scene->view->normal,M);
makeviewV();
setview(scene->view);
break;
case Qt::Key_Left:
Dir = v3_cross(scene->view->up,scene->view->normal);
scene->view->center = v3_add(scene->view->center,v3_scale(0.5,Dir));
makeviewV();
setview(scene->view);
break;
case Qt::Key_Right:
Dir = v3_cross(scene->view->up,scene->view->normal);
scene->view->center = v3_sub(scene->view->center,v3_scale(0.5,Dir));
makeviewV();
setview(scene->view);
break;
case Qt::Key_Up:
scene->view->center = v3_add(scene->view->center,v3_scale(0.5,scene->view->up));
makeviewV();
setview(scene->view);
break;
case Qt::Key_Down:
scene->view->center = v3_sub(scene->view->center,v3_scale(0.5,scene->view->up));
makeviewV();
setview(scene->view);
break;
case Qt::Key_Escape:
exit(0);
break;
case Qt::Key_R:
if (!lastfile.isEmpty())
load_scene_file(lastfile.toLatin1().data());
break;
}
update();
}
void
camera_setup(
camera_t * const c,
v3_t eye,
v3_t lookat,
v3_t up,
float fov
)
{
// compute the basis for the camera
// negative look direction from eye to destination
v3_t w = v3_norm(v3_sub(eye, lookat));
// compute the side axis
v3_t u = v3_norm(v3_cross(up, w));
// and the "up" normal
v3_t v = v3_norm(v3_cross(w, u));
m44_t cam = {{
{ u.p[0], u.p[1], u.p[2], -v3_dot(u,eye) },
{ v.p[0], v.p[1], v.p[2], -v3_dot(v,eye) },
{ w.p[0], w.p[1], w.p[2], -v3_dot(w,eye) },
{ 0, 0, 0, 1 },
}};
fprintf(stderr, "Camera:\n");
for(int i = 0 ; i < 4 ; i++)
{
for(int j = 0 ; j < 4 ; j++)
fprintf(stderr, " %+5.3f", cam.m[i][j]);
fprintf(stderr, "\n");
}
// now compute the perspective projection matrix
if(1) {
float s = 1000.0 / tan(fov * M_PI / 180 / 2);
c->near = 1;
c->far = 200;
float f1 = - c->far / (c->far - c->near);
float f2 = - c->far * c->near / (c->far - c->near);
m44_t pers = {{
{ s, 0, 0, 0 },
{ 0, s, 0, 0 },
{ 0, 0, f2, -1 },
{ 0, 0, f1, 0 },
}};
fprintf(stderr, "Perspective:\n");
for(int i = 0 ; i < 4 ; i++)
{
for(int j = 0 ; j < 4 ; j++)
fprintf(stderr, " %+5.3f", pers.m[i][j]);
fprintf(stderr, "\n");
}
m44_mult(&c->r, &pers, &cam);
} else {
// no perspective
m44_t pers = {{
{ 1, 0, 0, 0 },
{ 0, 1, 0, 0 },
{ 0, 0, 1, 0 },
{ 0, 0, 0, 1 },
}};
// and apply it to the camera matrix to generate transform
m44_mult(&c->r, &pers, &cam);
}
fprintf(stderr, "Cam*Pers\n");
for(int i = 0 ; i < 4 ; i++)
{
for(int j = 0 ; j < 4 ; j++)
fprintf(stderr, " %+5.3f", c->r.m[i][j]);
fprintf(stderr, "\n");
}
}
