//----------Plane Class----------//
void Scene::Plane::init_visualization()
{
m_positions.clear();
m_colors.clear();
m_normals.clear();
m_indices.clear();
glm::vec3 center(m_value * m_normal);
glm::vec3 local_x, local_z;
local_x = glm::cross(m_normal, glm::vec3(0.0f, 0.0f, 1.0f));
if(glm::length(local_x) < 0.00001f)
local_x = glm::cross(m_normal, glm::vec3(1.0f, 0.0f, 0.0f));
local_x = glm::normalize(local_x);
local_z = glm::normalize(glm::cross(local_x, m_normal));
glm::vec3 mat_color(0.6f);
unsigned int slice = 5;
glm::vec3 vertex(center);
m_positions.push_back(center);
m_normals.push_back(m_normal);
m_colors.push_back(mat_color);
float delta = 360.0f / slice;
float radius = 100.0f;
glm::vec3 local_pos;
for(float theta = 0.0f; theta < 359.99f; theta += delta)
{
local_pos.x = radius * cos(glm::radians(theta));
local_pos.z = radius * sin(glm::radians(theta));
vertex = local_pos.x * local_x - local_pos.z * local_z + center;
m_positions.push_back(vertex);
m_normals.push_back(m_normal);
m_colors.push_back(mat_color);
}
for(unsigned int i = 0; i < slice; ++i)
{
m_indices.push_back(0);
m_indices.push_back(i + 1);
m_indices.push_back(i + 2);
}
m_indices.push_back(0);
m_indices.push_back(slice);
m_indices.push_back(1);
}
//----------OBJMesh Class----------//
void ObjMesh::read_from_file(char* filename)
{
m_positions.clear();
m_colors.clear();
m_normals.clear();
m_indices.clear();
glm::vec3 mat_color(0.6);
// vertices and color
std::ifstream infile(filename);
if(!infile.good())
{
printf("Error in loading file %s\n", filename);
exit(0);
}
char buffer[256];
unsigned int ip0, ip1, ip2;
unsigned int n0, n1, n2;
glm::vec3 pos;
while(!infile.getline(buffer,255).eof())
{
buffer[255] = '\0';
if(buffer[0] == 'v' && (buffer[1] == ' ' || buffer[1] == 32))
{
if(sscanf_s(buffer, "v %f %f %f", &pos.x, &pos.y, &pos.z) == 3)
{
pos = m_scaling * pos;
m_positions.push_back(pos);
}
else
{
printf("Vertex is not in desired format.\n");
exit(0);
}
}
else if (buffer[0] == 'v' && buffer[1] == 'n' && (buffer[2] == ' ' || buffer[2] == 32))
{
// load normals from obj file.
}
else if (buffer[0] == 'f' && (buffer[1] == ' ' || buffer[1] == 32))
{
if(sscanf_s(buffer, "f %u %u %u", &ip0, &ip1, &ip2) == 3)
{
m_indices.push_back(--ip0);
m_indices.push_back(--ip1);
m_indices.push_back(--ip2);
}
else if(sscanf_s(buffer, "f %u//%u %u//%u %u//%u", &ip0, &n0, &ip1, &n1, &ip2, &n2) == 6)
{
m_indices.push_back(--ip0);
m_indices.push_back(--ip1);
m_indices.push_back(--ip2);
}
else if(sscanf_s(buffer, "f %u/%u %u/%u %u/%u", &ip0, &n0, &ip1, &n1, &ip2, &n2) == 6)
{
m_indices.push_back(--ip0);
m_indices.push_back(--ip1);
m_indices.push_back(--ip2);
}
else
{
printf("Triangle indices is not in desired format.\n");
exit(0);
}
}
}
// normals
unsigned int id, size;
bool vert_norm = (m_normals.size() != m_positions.size());
if(vert_norm)
m_normals.resize(m_positions.size(), glm::vec3(0.0f));
size = m_indices.size();
glm::uvec3 triangle;
glm::vec3 p0, p1, p2;
glm::vec3 norm;
float phi0, phi1, phi2;
float pi = glm::radians(180.0f);
for(id = 0; id < size; id+=3)
{
triangle = glm::uvec3(m_indices[id], m_indices[id+1], m_indices[id+2]);
p0 = m_positions[triangle.x];
p1 = m_positions[triangle.y];
p2 = m_positions[triangle.z];
norm = glm::normalize(glm::cross(p1 - p0, p2 - p0));
// calculate vertex normal
if(vert_norm)
{
phi0 = std::acos(glm::dot(p1 - p0, p2 - p0) / (glm::length(p1 - p0) * glm::length(p2 - p0)));
phi1 = std::acos(glm::dot(p0 - p1, p2 - p1) / (glm::length(p0 - p1) * glm::length(p2 - p1)));
phi2 = pi - phi0 - phi1;
m_normals[triangle.x] += phi0 * norm;
m_normals[triangle.y] += phi1 * norm;
m_normals[triangle.z] += phi2 * norm;
}
}
// re-normalize all normals
for(std::vector<glm::vec3>::iterator iter = m_normals.begin(); iter != m_normals.end(); ++iter)
{
*iter = glm::normalize(*iter);
m_colors.push_back(mat_color);
//m_colors.push_back(*iter);
}
}
//----------Sphere Class----------//
void Scene::Sphere::init_visualization()
{
m_positions.clear();
m_colors.clear();
m_normals.clear();
m_indices.clear();
glm::vec3 mat_color(0.6f);
unsigned int slice = 24, stack = 10;
glm::vec3 tnormal(0.0f, 1.0f, 0.0f), tpos;
tpos = m_center + m_radius * tnormal;
m_positions.push_back(tpos);
m_normals.push_back(tnormal);
m_colors.push_back(mat_color);
float theta_z, theta_y, sin_z;
float delta_y = 360.0f / slice, delta_z = 180.0f / stack;
//loop over the sphere
for(theta_z = delta_z; theta_z < 179.99f; theta_z += delta_z)
{
for(theta_y = 0.0f; theta_y < 359.99f; theta_y += delta_y)
{
sin_z = sin(glm::radians(theta_z));
tnormal.x = sin_z * cos(glm::radians(theta_y));
tnormal.y = cos(glm::radians(theta_z));
tnormal.z = -sin_z * sin(glm::radians(theta_y));
tpos = m_center + m_radius * tnormal;
m_positions.push_back(tpos);
m_normals.push_back(tnormal);
m_colors.push_back(mat_color);
}
}
tnormal = glm::vec3(0.0f, -1.0f, 0.0f);
tpos = m_center + m_radius * tnormal;
m_positions.push_back(tpos);
m_normals.push_back(tnormal);
m_colors.push_back(mat_color);
//indices
unsigned int j = 0, k = 0;
for(j = 0; j < slice - 1; ++j)
{
m_indices.push_back(0);
m_indices.push_back(j + 1);
m_indices.push_back(j + 2);
}
m_indices.push_back(0);
m_indices.push_back(slice);
m_indices.push_back(1);
for(j = 0; j < stack - 2; ++j)
{
for(k = 1 + slice * j; k < slice * (j + 1); ++k)
{
m_indices.push_back(k);
m_indices.push_back(k + slice);
m_indices.push_back(k + slice + 1);
m_indices.push_back(k);
m_indices.push_back(k + slice + 1);
m_indices.push_back(k + 1);
}
m_indices.push_back(k);
m_indices.push_back(k + slice);
m_indices.push_back(k + 1);
m_indices.push_back(k);
m_indices.push_back(k + 1);
m_indices.push_back(k + 1 - slice);
}
unsigned int bottom_id = (stack - 1) * slice + 1;
unsigned int offset = bottom_id - slice;
for(j = 0; j < slice - 1; ++j)
{
m_indices.push_back(j + offset);
m_indices.push_back(bottom_id);
m_indices.push_back(j + offset + 1);
}
m_indices.push_back(bottom_id - 1);
m_indices.push_back(bottom_id);
m_indices.push_back(offset);
if(m_indices.size() != 6 * (stack - 1) * slice)
printf("indices number not correct!\n");
}
//----------Cube Class----------//
void Cube::init_visualization()
{
m_positions.clear();
m_colors.clear();
m_normals.clear();
m_indices.clear();
glm::vec3 mat_color(0.6);
// front face 012, 321
m_positions.push_back(glm::vec3(-m_hf_dims.x, -m_hf_dims.y, +m_hf_dims.z));
m_colors.push_back(mat_color);
m_normals.push_back(glm::vec3(0,0,1));
m_positions.push_back(glm::vec3(+m_hf_dims.x, -m_hf_dims.y, +m_hf_dims.z));
m_colors.push_back(mat_color);
m_normals.push_back(glm::vec3(0,0,1));
m_positions.push_back(glm::vec3(-m_hf_dims.x, +m_hf_dims.y, +m_hf_dims.z));
m_colors.push_back(mat_color);
m_normals.push_back(glm::vec3(0,0,1));
m_positions.push_back(glm::vec3(+m_hf_dims.x, +m_hf_dims.y, +m_hf_dims.z));
m_colors.push_back(mat_color);
m_normals.push_back(glm::vec3(0,0,1));
m_indices.push_back(0);
m_indices.push_back(1);
m_indices.push_back(2);
m_indices.push_back(3);
m_indices.push_back(2);
m_indices.push_back(1);
// back face 654 567
m_positions.push_back(glm::vec3(-m_hf_dims.x, -m_hf_dims.y, -m_hf_dims.z));
m_colors.push_back(mat_color);
m_normals.push_back(glm::vec3(0,0,-1));
m_positions.push_back(glm::vec3(+m_hf_dims.x, -m_hf_dims.y, -m_hf_dims.z));
m_colors.push_back(mat_color);
m_normals.push_back(glm::vec3(0,0,-1));
m_positions.push_back(glm::vec3(-m_hf_dims.x, +m_hf_dims.y, -m_hf_dims.z));
m_colors.push_back(mat_color);
m_normals.push_back(glm::vec3(0,0,-1));
m_positions.push_back(glm::vec3(+m_hf_dims.x, +m_hf_dims.y, -m_hf_dims.z));
m_colors.push_back(mat_color);
m_normals.push_back(glm::vec3(0,0,-1));
m_indices.push_back(6);
m_indices.push_back(5);
m_indices.push_back(4);
m_indices.push_back(5);
m_indices.push_back(6);
m_indices.push_back(7);
// right face 8 9 10, 11 10 9
m_positions.push_back(glm::vec3(+m_hf_dims.x, -m_hf_dims.y, +m_hf_dims.z));
m_colors.push_back(mat_color);
m_normals.push_back(glm::vec3(1,0,0));
m_positions.push_back(glm::vec3(+m_hf_dims.x, -m_hf_dims.y, -m_hf_dims.z));
m_colors.push_back(mat_color);
m_normals.push_back(glm::vec3(1,0,0));
m_positions.push_back(glm::vec3(+m_hf_dims.x, +m_hf_dims.y, +m_hf_dims.z));
m_colors.push_back(mat_color);
m_normals.push_back(glm::vec3(1,0,0));
m_positions.push_back(glm::vec3(+m_hf_dims.x, +m_hf_dims.y, -m_hf_dims.z));
m_colors.push_back(mat_color);
m_normals.push_back(glm::vec3(1,0,0));
m_indices.push_back(8);
m_indices.push_back(9);
m_indices.push_back(10);
m_indices.push_back(11);
m_indices.push_back(10);
m_indices.push_back(9);
// left face 14 13 12, 13 14 15
m_positions.push_back(glm::vec3(-m_hf_dims.x, -m_hf_dims.y, +m_hf_dims.z));
m_colors.push_back(mat_color);
m_normals.push_back(glm::vec3(-1,0,0));
m_positions.push_back(glm::vec3(-m_hf_dims.x, -m_hf_dims.y, -m_hf_dims.z));
m_colors.push_back(mat_color);
m_normals.push_back(glm::vec3(-1,0,0));
m_positions.push_back(glm::vec3(-m_hf_dims.x, +m_hf_dims.y, +m_hf_dims.z));
m_colors.push_back(mat_color);
m_normals.push_back(glm::vec3(-1,0,0));
m_positions.push_back(glm::vec3(-m_hf_dims.x, +m_hf_dims.y, -m_hf_dims.z));
m_colors.push_back(mat_color);
m_normals.push_back(glm::vec3(-1,0,0));
m_indices.push_back(14);
m_indices.push_back(13);
m_indices.push_back(12);
m_indices.push_back(13);
m_indices.push_back(14);
m_indices.push_back(15);
// top face 16 17 18, 19 18 17
m_positions.push_back(glm::vec3(-m_hf_dims.x, +m_hf_dims.y, +m_hf_dims.z));
m_colors.push_back(mat_color);
m_normals.push_back(glm::vec3(0,1,0));
m_positions.push_back(glm::vec3(+m_hf_dims.x, +m_hf_dims.y, +m_hf_dims.z));
m_colors.push_back(mat_color);
m_normals.push_back(glm::vec3(0,1,0));
m_positions.push_back(glm::vec3(-m_hf_dims.x, +m_hf_dims.y, -m_hf_dims.z));
m_colors.push_back(mat_color);
m_normals.push_back(glm::vec3(0,1,0));
m_positions.push_back(glm::vec3(+m_hf_dims.x, +m_hf_dims.y, -m_hf_dims.z));
m_colors.push_back(mat_color);
m_normals.push_back(glm::vec3(0,1,0));
m_indices.push_back(16);
m_indices.push_back(17);
m_indices.push_back(18);
m_indices.push_back(19);
m_indices.push_back(18);
m_indices.push_back(17);
// bottom face 22 21 20, 21 22 23
m_positions.push_back(glm::vec3(-m_hf_dims.x, -m_hf_dims.y, +m_hf_dims.z));
m_colors.push_back(mat_color);
m_normals.push_back(glm::vec3(0,-1,0));
m_positions.push_back(glm::vec3(+m_hf_dims.x, -m_hf_dims.y, +m_hf_dims.z));
m_colors.push_back(mat_color);
m_normals.push_back(glm::vec3(0,-1,0));
m_positions.push_back(glm::vec3(-m_hf_dims.x, -m_hf_dims.y, -m_hf_dims.z));
m_colors.push_back(mat_color);
m_normals.push_back(glm::vec3(0,-1,0));
m_positions.push_back(glm::vec3(+m_hf_dims.x, -m_hf_dims.y, -m_hf_dims.z));
m_colors.push_back(mat_color);
m_normals.push_back(glm::vec3(0,-1,0));
m_indices.push_back(22);
m_indices.push_back(21);
m_indices.push_back(20);
m_indices.push_back(21);
m_indices.push_back(22);
m_indices.push_back(23);
}
