void ObjLoader::createGeometryInstances( GLMmodel* model,
Program mesh_intersect,
Program mesh_bbox )
{
std::vector<GeometryInstance> instances;
// Loop over all groups -- grab the triangles and material props from each group
unsigned int triangle_count = 0u;
unsigned int group_count = 0u;
for ( GLMgroup* obj_group = model->groups;
obj_group != 0;
obj_group = obj_group->next, group_count++ ) {
unsigned int num_triangles = obj_group->numtriangles;
if ( num_triangles == 0 ) continue;
// Create vertex index buffers
Buffer vindex_buffer = _context->createBuffer( RT_BUFFER_INPUT, RT_FORMAT_INT3, num_triangles );
int3* vindex_buffer_data = static_cast<int3*>( vindex_buffer->map() );
Buffer tindex_buffer = _context->createBuffer( RT_BUFFER_INPUT, RT_FORMAT_INT3, num_triangles );
int3* tindex_buffer_data = static_cast<int3*>( tindex_buffer->map() );
Buffer nindex_buffer = _context->createBuffer( RT_BUFFER_INPUT, RT_FORMAT_INT3, num_triangles );
int3* nindex_buffer_data = static_cast<int3*>( nindex_buffer->map() );
// TODO: Create empty buffer for mat indices, have obj_material check for zero length
Buffer mbuffer = _context->createBuffer( RT_BUFFER_INPUT, RT_FORMAT_UNSIGNED_INT, num_triangles );
unsigned int* mbuffer_data = static_cast<unsigned int*>( mbuffer->map() );
// Create the mesh object
Geometry mesh = _context->createGeometry();
mesh->setPrimitiveCount( num_triangles );
mesh->setIntersectionProgram( mesh_intersect);
mesh->setBoundingBoxProgram( mesh_bbox );
mesh[ "vertex_buffer" ]->setBuffer( _vbuffer );
mesh[ "normal_buffer" ]->setBuffer( _nbuffer );
mesh[ "texcoord_buffer" ]->setBuffer( _tbuffer );
mesh[ "vindex_buffer" ]->setBuffer( vindex_buffer );
mesh[ "tindex_buffer" ]->setBuffer( tindex_buffer );
mesh[ "nindex_buffer" ]->setBuffer( nindex_buffer );
mesh[ "material_buffer" ]->setBuffer( mbuffer );
// Create the geom instance to hold mesh and material params
GeometryInstance instance = _context->createGeometryInstance( mesh, &_material, &_material+1 );
loadMaterialParams( instance, obj_group->material );
instances.push_back( instance );
for ( unsigned int i = 0; i < obj_group->numtriangles; ++i, ++triangle_count ) {
unsigned int tindex = obj_group->triangles[i];
int3 vindices;
vindices.x = model->triangles[ tindex ].vindices[0] - 1;
vindices.y = model->triangles[ tindex ].vindices[1] - 1;
vindices.z = model->triangles[ tindex ].vindices[2] - 1;
assert( vindices.x <= static_cast<int>(model->numvertices) );
assert( vindices.y <= static_cast<int>(model->numvertices) );
assert( vindices.z <= static_cast<int>(model->numvertices) );
int3 nindices;
nindices.x = model->triangles[ tindex ].nindices[0] - 1;
nindices.y = model->triangles[ tindex ].nindices[1] - 1;
nindices.z = model->triangles[ tindex ].nindices[2] - 1;
assert( nindices.x <= static_cast<int>(model->numnormals) );
assert( nindices.y <= static_cast<int>(model->numnormals) );
assert( nindices.z <= static_cast<int>(model->numnormals) );
int3 tindices;
tindices.x = model->triangles[ tindex ].tindices[0] - 1;
tindices.y = model->triangles[ tindex ].tindices[1] - 1;
tindices.z = model->triangles[ tindex ].tindices[2] - 1;
assert( tindices.x <= static_cast<int>(model->numtexcoords) );
assert( tindices.y <= static_cast<int>(model->numtexcoords) );
assert( tindices.z <= static_cast<int>(model->numtexcoords) );
vindex_buffer_data[ i ] = vindices;
nindex_buffer_data[ i ] = nindices;
tindex_buffer_data[ i ] = tindices;
mbuffer_data[ i ] = 0; // See above TODO
}
vindex_buffer->unmap();
tindex_buffer->unmap();
nindex_buffer->unmap();
mbuffer->unmap();
}
assert( triangle_count == model->numtriangles );
// Set up group
_geometrygroup->setChildCount( static_cast<unsigned int>(instances.size()) );
Acceleration acceleration = _context->createAcceleration("Sbvh","Bvh");
acceleration->setProperty( "vertex_buffer_name", "vertex_buffer" );
acceleration->setProperty( "index_buffer_name", "vindex_buffer" );
_geometrygroup->setAcceleration( acceleration );
acceleration->markDirty();
for ( unsigned int i = 0; i < instances.size(); ++i )
_geometrygroup->setChild( i, instances[i] );
}
void MeshViewer::initGeometry()
{
m_geometry_group = m_context->createGeometryGroup();
if( ObjLoader::isMyFile( m_filename.c_str() ) ) {
// Load OBJ model
ObjLoader* loader = 0;
if( m_shade_mode == SM_NORMAL || m_shade_mode == SM_AO ) {
loader = new ObjLoader( m_filename.c_str(), m_context, m_geometry_group, m_material );
} else if ( m_shade_mode == SM_ONE_BOUNCE_DIFFUSE ) {
loader = new ObjLoader( m_filename.c_str(), m_context, m_geometry_group, m_material, true );
} else {
loader = new ObjLoader( m_filename.c_str(), m_context, m_geometry_group );
}
const std::string geom_ptx = ptxpath( "displacement", "geometry_programs.cu" );
loader->setIntersectProgram(m_context->createProgramFromPTXFile( geom_ptx, "mesh_intersect" ) );
loader->setBboxProgram(m_context->createProgramFromPTXFile( geom_ptx, "mesh_bounds" ) );
loader->load();
m_aabb = loader->getSceneBBox();
delete loader;
} else if( PlyLoader::isMyFile( m_filename ) ) {
// Load PLY model
PlyLoader loader( m_filename, m_context, m_geometry_group, m_material );
loader.load();
m_aabb = loader.getSceneBBox();
} else {
std::cerr << "Unrecognized model file extension '" << m_filename << "'" << std::endl;
exit( 0 );
}
// Override acceleration structure builder. The default used by the ObjLoader is Sbvh.
if( !m_accel_builder.empty() ) {
Acceleration accel = m_geometry_group->getAcceleration();
accel->setBuilder( m_accel_builder );
}
Acceleration accel = m_geometry_group->getAcceleration();
accel->setBuilder("Bvh");
// Override traverer if one is given.
if( !m_accel_traverser.empty() ) {
Acceleration accel = m_geometry_group->getAcceleration();
accel->setTraverser( m_accel_traverser );
}
if( m_accel_builder == "TriangleKdTree" || m_accel_traverser == "KdTree") {
Acceleration accel = m_geometry_group->getAcceleration();
accel->setProperty( "vertex_buffer_name", "vertex_buffer" );
accel->setProperty( "index_buffer_name", "vindex_buffer" );
}
// Load acceleration structure from a file if that was enabled on the
// command line, and if we can find a cache file. Note that the type of
// acceleration used will be overridden by what is found in the file.
loadAccelCache();
m_context[ "top_object" ]->set( m_geometry_group );
m_context[ "top_shadower" ]->set( m_geometry_group );
}
