/**
* Constructor for mesh object which is stored in file 'file_name'.
* Assume that the file content is in the correct format.
*/
MeshData::MeshData(char *file_name) {
FILE *fp = fopen(file_name, "rt");
char line[LINE_MAX];
char delims[] = " ";
char *type = NULL;
char *var1 = NULL;
char *var2 = NULL;
char *var3 = NULL;
if (fp != NULL) {
while (fgets(line, LINE_MAX, fp) != NULL) {
if (strlen(line) == 0)
continue;
// data is stored in 'line' now
type = strtok(line, delims);
if (strcmp(type, "#") == 0 || strcmp(type, "g") == 0) { // just comments
continue;
}
var1 = strtok(NULL, delims);
var2 = strtok(NULL, delims);
var3 = strtok(NULL, delims);
if (strcmp(type, "v") == 0) { // this line represents a vertex
Vec3f vertex(atof(var1), atof(var2), atof(var3));
PositionList.push_back(vertex);
}
else if (strcmp(type, "f") == 0) { // this line represents a face
Vec3i face(atoi(var1), atoi(var2), atoi(var3));
TriIndices.push_back(face);
}
}
// end of file reached
fclose(fp);
computeFaceNormals();
computeUnitVertexNormals();
}
else {
perror("error opening mesh file");
exit(1);
}
}
void TetrahedralMesh::init(){
computeBBox();
computeFaceNormals();
}
void SphereGeometry::initialize( float radius,
float segmentsWidth,
float segmentsHeight,
float phiStart,
float phiLength,
float thetaStart,
float thetaLength ) {
const auto segmentsX = Math::max( 3, ( int )Math::floor( segmentsWidth ) );
const auto segmentsY = Math::max( 2, ( int )Math::floor( segmentsHeight ) );
std::vector<std::vector<int>> indices;
std::vector<std::vector<Vector2>> uvs;
for ( int y = 0; y <= segmentsY; y ++ ) {
std::vector<int> indicesRow;
std::vector<Vector2> uvsRow;
for ( int x = 0; x <= segmentsX; x ++ ) {
const auto u = ( float )x / segmentsX;
const auto v = ( float )y / segmentsY;
Vertex vertex;
vertex.x = - radius * Math::cos( phiStart + u * phiLength ) * Math::sin( thetaStart + v * thetaLength );
vertex.y = radius * Math::cos( thetaStart + v * thetaLength );
vertex.z = radius * Math::sin( phiStart + u * phiLength ) * Math::sin( thetaStart + v * thetaLength );
vertices.push_back( vertex );
indicesRow.push_back( ( int )vertices.size() - 1 );
uvsRow.push_back( Vector2( u, 1 - v ) );
}
indices.push_back( indicesRow );
uvs.push_back( uvsRow );
}
for ( int y = 0; y < segmentsY; y ++ ) {
for ( int x = 0; x < segmentsX; x ++ ) {
const auto v1 = indices[ y ][ x + 1 ];
const auto v2 = indices[ y ][ x ];
const auto v3 = indices[ y + 1 ][ x ];
const auto v4 = indices[ y + 1 ][ x + 1 ];
const auto n1 = vertices[ v1 ].clone().normalize();
const auto n2 = vertices[ v2 ].clone().normalize();
const auto n3 = vertices[ v3 ].clone().normalize();
const auto n4 = vertices[ v4 ].clone().normalize();
const auto& uv1 = uvs[ y ][ x + 1 ];
const auto& uv2 = uvs[ y ][ x ];
const auto& uv3 = uvs[ y + 1 ][ x ];
const auto& uv4 = uvs[ y + 1 ][ x + 1 ];
if ( Math::abs( vertices[ v1 ].y ) == radius ) {
faces.push_back( Face( v1, v3, v4, n1, n3, n4 ) );
faceVertexUvs[ 0 ].push_back( toArray( uv1, uv3, uv4 ) );
} else if ( Math::abs( vertices[ v3 ].y ) == radius ) {
faces.push_back( Face( v1, v2, v3, n1, n2, n3 ) );
faceVertexUvs[ 0 ].push_back( toArray( uv1, uv2, uv3 ) );
} else {
faces.push_back( Face( v1, v2, v4, n1, n2, n4 ) );
faceVertexUvs[ 0 ].push_back( toArray( uv1, uv2, uv4 ) );
faces.push_back( Face( v2, v3, v4, n2.clone(), n3, n4.clone() ) );
faceVertexUvs[ 0 ].push_back( toArray( uv2.clone(), uv3, uv4.clone() ) );
}
}
}
computeCentroids();
computeFaceNormals();
boundingSphere = Sphere( Vector3(), radius);
}
