/*recursively computes the specular component of this triangle
*identically implement as that of sphere. After ray hits the surface position
*it will spawn a reflected ray of the surface, and potentailly a refracted ray
*we then recursively call the specular function on those new rays*/
Color3 Triangle::compute_specular(const Scene* scene, const Vector3 &normal,
const Vector3 &incoming_ray, const Vector3 &surface_pos, int depth) const{
Geometry* const* sceneObjects = scene->get_geometries();
Vector3 refl_ray = normalize(incoming_ray - 2*dot(incoming_ray,normal)*normal);
Vector3 slop_pos = surface_pos + EPSILON*refl_ray;
real_t minTime = UNINITIALIZED;
Geometry* geo = sceneObjects[0];
Color3 tex_color = compute_texture();
for(unsigned int i=0;i<scene->num_geometries(); i++){
Geometry* temp_geo = sceneObjects[i];
if(temp_geo->is_intersecting(refl_ray,slop_pos,&minTime) != NOINTERSECTION){
geo = temp_geo;
}
}
if(minTime != UNINITIALIZED){
Vector3 new_pos = surface_pos + refl_ray*minTime;
Color3 returnColor = geo->color_at_pixel(scene,new_pos);
if(depth == 1)
return returnColor;
else{
int new_depth = depth-1;
Color3 specular = geo->get_specular();
Vector3 new_norm = geo->normal_of(new_pos);
// RECURSIVE CALL IS HERE!!!!
return tex_color*(returnColor + specular*geo->compute_specular(scene,new_norm,refl_ray,new_pos,new_depth));
}
}
return tex_color*scene->background_color;
}
/* based on the ambient, and diffuse components of color
* and the barycentric coordinates of the point on the triangle
* we compute the color at the given pixel coordinates
* and then interpolate with alpha beta gamma
* */
Color3 Triangle::color_at_pixel(const Scene* scene, const Vector3 &surface_pos) const {
Color3 ambA = vertices[0].material->ambient;
Color3 ambB = vertices[1].material->ambient;
Color3 ambC = vertices[2].material->ambient;
Color3 diffA = vertices[0].material->diffuse;
Color3 diffB = vertices[1].material->diffuse;
Color3 diffC = vertices[2].material->diffuse;
Color3 bary_amb = ALPHA*ambA + BETA*ambB + GAMMA*ambC;
Color3 bary_diff = ALPHA*diffA + BETA*diffB + GAMMA*diffC;
Vector3 bary_normal = normal_of(surface_pos);
Color3 tex_color = compute_texture();
return tex_color*(scene->ambient_light*bary_amb + bary_diff*compute_diffuse(scene,bary_normal, surface_pos));
}
void Scene::compute_elements(int mode)
{
pos_points.resize(0);
pos_lines.resize(0);
pos_poly.resize(0);
pos_cut_segments.resize(0);
tex_map.resize(0);
pos_grid.resize(66);
pos_plane.resize(18);
float diag = .6f * float(bbox_diag());
//The Points
{
std::list<Point>::iterator pit;
for(pit = m_points.begin(); pit != m_points.end(); pit++)
{
const Point& p = *pit;
pos_points.push_back(p.x());
pos_points.push_back(p.y());
pos_points.push_back(p.z());
}
}
//The Segements
{
std::list<Segment>::iterator sit;
for(sit = m_segments.begin(); sit != m_segments.end(); sit++)
{
const Segment& s = *sit;
const Point& p = s.source();
const Point& q = s.target();
pos_lines.push_back(p.x());
pos_lines.push_back(p.y());
pos_lines.push_back(p.z());
pos_lines.push_back(q.x());
pos_lines.push_back(q.y());
pos_lines.push_back(q.z());
}
}
//The Polygon's edges
{
Polyhedron::Edge_iterator he;
for(he = m_pPolyhedron->edges_begin();
he != m_pPolyhedron->edges_end();
he++)
{
const Point& a = he->vertex()->point();
const Point& b = he->opposite()->vertex()->point();
pos_poly.push_back(a.x());
pos_poly.push_back(a.y());
pos_poly.push_back(a.z());
pos_poly.push_back(b.x());
pos_poly.push_back(b.y());
pos_poly.push_back(b.z());
}
}
//The cutting segments
{
for ( std::vector<Segment>::const_iterator csit = m_cut_segments.begin(),
end = m_cut_segments.end() ; csit != end ; ++csit )
{
const Point& a = csit->source();
const Point& b = csit->target();
pos_cut_segments.push_back(a.x());
pos_cut_segments.push_back(a.y());
pos_cut_segments.push_back(a.z());
pos_cut_segments.push_back(b.x());
pos_cut_segments.push_back(b.y());
pos_cut_segments.push_back(b.z());
}
}
//The cutting plane
{
pos_plane[0]= -diag; pos_plane[1]=-diag; pos_plane[2]=0.0;
pos_plane[3]= -diag; pos_plane[4]= diag; pos_plane[5]=0.;
pos_plane[6]= diag; pos_plane[7]= diag; pos_plane[8]=0.;
pos_plane[9]= -diag; pos_plane[10]= -diag; pos_plane[11]=0.;
pos_plane[12]= diag; pos_plane[13]= diag; pos_plane[14]= 0.;
pos_plane[15]= diag; pos_plane[16]= -diag; pos_plane[17]= 0.;
//UV Mapping
tex_map.push_back(-0.11f);
tex_map.push_back(-0.11f);
tex_map.push_back(-0.11f);
tex_map.push_back(1.11f);
tex_map.push_back(1.11f);
tex_map.push_back(1.11f);
tex_map.push_back(-0.11f);
tex_map.push_back(-0.11f);
tex_map.push_back(1.11f);
tex_map.push_back(1.11f);
tex_map.push_back(1.11f);
tex_map.push_back(-0.11f);
}
//The grid
{
float z = 0;
float x = (2 * diag)/10.0;
float y = (2 * diag)/10.0;
for(int u = 0; u < 11; u++)
{
pos_grid.push_back(-diag + x* u);
pos_grid.push_back(-diag);
pos_grid.push_back(z);
pos_grid.push_back(-diag + x* u);
pos_grid.push_back(diag);
pos_grid.push_back(z);
}
for(int v=0; v<11; v++)
{
pos_grid.push_back(-diag);
pos_grid.push_back(-diag + v * y);
pos_grid.push_back(z);
pos_grid.push_back(diag);
pos_grid.push_back(-diag + v * y);
pos_grid.push_back(z);
}
}
//The texture
switch(mode)
{
case _SIGNED:
for( int i=0 ; i < texture->getWidth(); i++ )
{
for( int j=0 ; j < texture->getHeight() ; j++)
{
compute_texture(i,j,m_red_ramp,m_blue_ramp);
}
}
break;
case _UNSIGNED:
for( int i=0 ; i < texture->getWidth(); i++ )
{
for( int j=0 ; j < texture->getHeight() ; j++)
{
compute_texture(i,j,m_thermal_ramp,m_thermal_ramp);
}
}
break;}
sampler_location = tex_rendering_program.attributeLocation("texture");
}
void Scene_implicit_function_item::compute_elements()
{
v_cube.resize(0);
v_plan.resize(0);
texture_map.resize(0);
// The Quad
{
//A
v_plan.push_back(bbox().xmin);
v_plan.push_back(bbox().ymin);
v_plan.push_back(0);
//B
v_plan.push_back(bbox().xmin);
v_plan.push_back(bbox().ymax);
v_plan.push_back(0);
//C
v_plan.push_back(bbox().xmax);
v_plan.push_back(bbox().ymin);
v_plan.push_back(0);
//C
v_plan.push_back(bbox().xmax);
v_plan.push_back(bbox().ymin);
v_plan.push_back(0);
//B
v_plan.push_back(bbox().xmin);
v_plan.push_back(bbox().ymax);
v_plan.push_back(0);
//D
v_plan.push_back(bbox().xmax);
v_plan.push_back(bbox().ymax);
v_plan.push_back(0);
//UV Mapping
texture_map.push_back(0.0);
texture_map.push_back(0.0);
texture_map.push_back(0.0);
texture_map.push_back(1.0);
texture_map.push_back(1.0);
texture_map.push_back(0.0);
texture_map.push_back(1.0);
texture_map.push_back(0.0);
texture_map.push_back(0.0);
texture_map.push_back(1.0);
texture_map.push_back(1.0);
texture_map.push_back(1.0);
}
//The box
{
v_cube.push_back(bbox().xmin);
v_cube.push_back(bbox().ymin);
v_cube.push_back(bbox().zmin);
v_cube.push_back(bbox().xmin);
v_cube.push_back(bbox().ymin);
v_cube.push_back(bbox().zmax);
v_cube.push_back(bbox().xmin);
v_cube.push_back(bbox().ymin);
v_cube.push_back(bbox().zmin);
v_cube.push_back(bbox().xmin);
v_cube.push_back(bbox().ymax);
v_cube.push_back(bbox().zmin);
v_cube.push_back(bbox().xmin);
v_cube.push_back(bbox().ymin);
v_cube.push_back(bbox().zmin);
v_cube.push_back(bbox().xmax);
v_cube.push_back(bbox().ymin);
v_cube.push_back(bbox().zmin);
v_cube.push_back(bbox().xmax);
v_cube.push_back(bbox().ymin);
v_cube.push_back(bbox().zmin);
v_cube.push_back(bbox().xmax);
v_cube.push_back(bbox().ymax);
v_cube.push_back(bbox().zmin);
v_cube.push_back(bbox().xmax);
v_cube.push_back(bbox().ymin);
v_cube.push_back(bbox().zmin);
v_cube.push_back(bbox().xmax);
v_cube.push_back(bbox().ymin);
v_cube.push_back(bbox().zmax);
v_cube.push_back(bbox().xmin);
v_cube.push_back(bbox().ymax);
v_cube.push_back(bbox().zmin);
v_cube.push_back(bbox().xmin);
v_cube.push_back(bbox().ymax);
v_cube.push_back(bbox().zmax);
v_cube.push_back(bbox().xmin);
v_cube.push_back(bbox().ymax);
v_cube.push_back(bbox().zmin);
v_cube.push_back(bbox().xmax);
v_cube.push_back(bbox().ymax);
v_cube.push_back(bbox().zmin);
v_cube.push_back(bbox().xmax);
v_cube.push_back(bbox().ymax);
v_cube.push_back(bbox().zmin);
v_cube.push_back(bbox().xmax);
v_cube.push_back(bbox().ymax);
v_cube.push_back(bbox().zmax);
v_cube.push_back(bbox().xmin);
v_cube.push_back(bbox().ymin);
v_cube.push_back(bbox().zmax);
v_cube.push_back(bbox().xmin);
v_cube.push_back(bbox().ymax);
v_cube.push_back(bbox().zmax);
v_cube.push_back(bbox().xmin);
v_cube.push_back(bbox().ymin);
v_cube.push_back(bbox().zmax);
v_cube.push_back(bbox().xmax);
v_cube.push_back(bbox().ymin);
v_cube.push_back(bbox().zmax);
v_cube.push_back(bbox().xmax);
v_cube.push_back(bbox().ymax);
v_cube.push_back(bbox().zmax);
v_cube.push_back(bbox().xmin);
v_cube.push_back(bbox().ymax);
v_cube.push_back(bbox().zmax);
v_cube.push_back(bbox().xmax);
v_cube.push_back(bbox().ymax);
v_cube.push_back(bbox().zmax);
v_cube.push_back(bbox().xmax);
v_cube.push_back(bbox().ymin);
v_cube.push_back(bbox().zmax);
}
//The texture
for(int i=0; i < texture->getWidth(); i++)
for( int j=0 ; j < texture->getHeight() ; j++)
{
compute_texture(i,j);
}
}
