void WhittedScene::createGeometry()
{
// Create glass sphere geometry
std::string shell_ptx( ptxpath( "whitted", "sphere_shell.cu" ) );
Geometry glass_sphere = m_context->createGeometry();
glass_sphere->setPrimitiveCount( 1u );
glass_sphere->setBoundingBoxProgram( m_context->createProgramFromPTXFile( shell_ptx, "bounds" ) );
glass_sphere->setIntersectionProgram( m_context->createProgramFromPTXFile( shell_ptx, "intersect" ) );
glass_sphere["center"]->setFloat( 4.0f, 2.3f, -4.0f );
glass_sphere["radius1"]->setFloat( 0.96f );
glass_sphere["radius2"]->setFloat( 1.0f );
// Metal sphere geometry
std::string sphere_ptx( ptxpath( "whitted", "sphere.cu" ) );
Geometry metal_sphere = m_context->createGeometry();
metal_sphere->setPrimitiveCount( 1u );
metal_sphere->setBoundingBoxProgram( m_context->createProgramFromPTXFile( sphere_ptx, "bounds" ) );
metal_sphere->setIntersectionProgram( m_context->createProgramFromPTXFile( sphere_ptx, "robust_intersect" ) );
metal_sphere["sphere"]->setFloat( 2.0f, 1.5f, -2.5f, 1.0f );
// Floor geometry
std::string pgram_ptx( ptxpath( "whitted", "parallelogram.cu" ) );
Geometry parallelogram = m_context->createGeometry();
parallelogram->setPrimitiveCount( 1u );
parallelogram->setBoundingBoxProgram( m_context->createProgramFromPTXFile( pgram_ptx, "bounds" ) );
parallelogram->setIntersectionProgram( m_context->createProgramFromPTXFile( pgram_ptx, "intersect" ) );
float3 anchor = make_float3( -16.0f, 0.01f, -8.0f );
float3 v1 = make_float3( 32.0f, 0.0f, 0.0f );
float3 v2 = make_float3( 0.0f, 0.0f, 16.0f );
float3 normal = cross( v1, v2 );
normal = normalize( normal );
float d = dot( normal, anchor );
v1 *= 1.0f/dot( v1, v1 );
v2 *= 1.0f/dot( v2, v2 );
float4 plane = make_float4( normal, d );
parallelogram["plane"]->setFloat( plane );
parallelogram["v1"]->setFloat( v1 );
parallelogram["v2"]->setFloat( v2 );
parallelogram["anchor"]->setFloat( anchor );
// Glass material
Program glass_ch = m_context->createProgramFromPTXFile( ptxpath( "whitted", "glass.cu" ), "closest_hit_radiance" );
Program glass_ah = m_context->createProgramFromPTXFile( ptxpath( "whitted", "glass.cu" ), "any_hit_shadow" );
Material glass_matl = m_context->createMaterial();
glass_matl->setClosestHitProgram( 0, glass_ch );
glass_matl->setAnyHitProgram( 1, glass_ah );
glass_matl["importance_cutoff"]->setFloat( 1e-2f );
glass_matl["cutoff_color"]->setFloat( 0.034f, 0.055f, 0.085f );
glass_matl["fresnel_exponent"]->setFloat( 3.0f );
glass_matl["fresnel_minimum"]->setFloat( 0.1f );
glass_matl["fresnel_maximum"]->setFloat( 1.0f );
glass_matl["refraction_index"]->setFloat( 1.4f );
glass_matl["refraction_color"]->setFloat( 1.0f, 1.0f, 1.0f );
glass_matl["reflection_color"]->setFloat( 1.0f, 1.0f, 1.0f );
glass_matl["refraction_maxdepth"]->setInt( 10 );
glass_matl["reflection_maxdepth"]->setInt( 5 );
float3 extinction = make_float3(.83f, .83f, .83f);
glass_matl["extinction_constant"]->setFloat( log(extinction.x), log(extinction.y), log(extinction.z) );
glass_matl["shadow_attenuation"]->setFloat( 0.6f, 0.6f, 0.6f );
// Metal material
Program phong_ch = m_context->createProgramFromPTXFile( ptxpath( "whitted", "phong.cu" ), "closest_hit_radiance" );
Program phong_ah = m_context->createProgramFromPTXFile( ptxpath( "whitted", "phong.cu" ), "any_hit_shadow" );
Material metal_matl = m_context->createMaterial();
metal_matl->setClosestHitProgram( 0, phong_ch );
metal_matl->setAnyHitProgram( 1, phong_ah );
metal_matl["Ka"]->setFloat( 0.2f, 0.5f, 0.5f );
metal_matl["Kd"]->setFloat( 0.2f, 0.7f, 0.8f );
metal_matl["Ks"]->setFloat( 0.9f, 0.9f, 0.9f );
metal_matl["phong_exp"]->setFloat( 64 );
metal_matl["reflectivity"]->setFloat( 0.5f, 0.5f, 0.5f);
// Checker material for floor
Program check_ch = m_context->createProgramFromPTXFile( ptxpath( "whitted", "checker.cu" ), "closest_hit_radiance" );
Program check_ah = m_context->createProgramFromPTXFile( ptxpath( "whitted", "checker.cu" ), "any_hit_shadow" );
Material floor_matl = m_context->createMaterial();
floor_matl->setClosestHitProgram( 0, check_ch );
floor_matl->setAnyHitProgram( 1, check_ah );
floor_matl["Kd1"]->setFloat( 0.8f, 0.3f, 0.15f);
floor_matl["Ka1"]->setFloat( 0.8f, 0.3f, 0.15f);
floor_matl["Ks1"]->setFloat( 0.0f, 0.0f, 0.0f);
floor_matl["Kd2"]->setFloat( 0.9f, 0.85f, 0.05f);
floor_matl["Ka2"]->setFloat( 0.9f, 0.85f, 0.05f);
floor_matl["Ks2"]->setFloat( 0.0f, 0.0f, 0.0f);
floor_matl["inv_checker_size"]->setFloat( 32.0f, 16.0f, 1.0f );
floor_matl["phong_exp1"]->setFloat( 0.0f );
floor_matl["phong_exp2"]->setFloat( 0.0f );
floor_matl["reflectivity1"]->setFloat( 0.0f, 0.0f, 0.0f);
floor_matl["reflectivity2"]->setFloat( 0.0f, 0.0f, 0.0f);
// Create GIs for each piece of geometry
std::vector<GeometryInstance> gis;
gis.push_back( m_context->createGeometryInstance( glass_sphere, &glass_matl, &glass_matl+1 ) );
gis.push_back( m_context->createGeometryInstance( metal_sphere, &metal_matl, &metal_matl+1 ) );
gis.push_back( m_context->createGeometryInstance( parallelogram, &floor_matl, &floor_matl+1 ) );
// Place all in group
GeometryGroup geometrygroup = m_context->createGeometryGroup();
geometrygroup->setChildCount( static_cast<unsigned int>(gis.size()) );
geometrygroup->setChild( 0, gis[0] );
geometrygroup->setChild( 1, gis[1] );
geometrygroup->setChild( 2, gis[2] );
geometrygroup->setAcceleration( m_context->createAcceleration("NoAccel","NoAccel") );
m_context["top_object"]->set( geometrygroup );
m_context["top_shadower"]->set( geometrygroup );
}
