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yocto_pbrt.h
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//
// # Yocto/Pbrt: Tiny library for Pbrt parsing and writing
//
// Yocto/Pbrt is a tiny library for loading and saving Pbrt.
//
//
// LICENSE:
//
// Copyright (c) 2016 -- 2020 Fabio Pellacini
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
//
#ifndef _YOCTO_PBRT_H_
#define _YOCTO_PBRT_H_
// -----------------------------------------------------------------------------
// INCLUDES
// -----------------------------------------------------------------------------
#include <algorithm>
#include <memory>
#include "yocto_math.h"
// -----------------------------------------------------------------------------
// ALIASES
// -----------------------------------------------------------------------------
namespace yocto::pbrt {
// Math defitions
using math::frame3f;
using math::identity3x4f;
using math::identity4x4f;
using math::mat4f;
using math::pif;
using math::vec2f;
using math::vec2i;
using math::vec3f;
using math::vec3i;
using math::vec4f;
using math::vec4i;
using math::zero2f;
using math::zero2i;
using math::zero3f;
using math::zero3i;
using math::zero4f;
} // namespace yocto::pbrt
// -----------------------------------------------------------------------------
// PBRT LOADER AND WRITER
// -----------------------------------------------------------------------------
namespace yocto::pbrt {
// Pbrt camera
struct camera {
// camera parameters
frame3f frame = identity3x4f;
frame3f frend = identity3x4f;
vec2i resolution = {0, 0};
float lens = 0;
float aspect = 0;
float focus = 0;
float aperture = 0;
};
// Pbrt material
struct material {
// material parameters
std::string name = "";
vec3f emission = {0, 0, 0};
vec3f color = {0, 0, 0};
float specular = 0;
float metallic = 0;
float transmission = 0;
float roughness = 0;
float eumelanin = 0;
float ior = 1.5;
float opacity = 1;
std::string color_tex = "";
std::string opacity_tex = "";
std::string alpha_tex = "";
bool thin = true;
vec3f volmeanfreepath = {0, 0, 0};
vec3f volscatter = {0, 0, 0};
float volscale = 0.01;
};
// Pbrt shape
struct shape {
// frames
frame3f frame = identity3x4f;
frame3f frend = identity3x4f;
std::vector<frame3f> instances = {};
std::vector<frame3f> instaends = {};
// shape
std::string filename_ = "";
std::vector<vec3f> positions = {};
std::vector<vec3f> normals = {};
std::vector<vec2f> texcoords = {};
std::vector<vec3i> triangles = {};
std::vector<float> radius = {};
std::vector<vec2i> lines = {};
// material
pbrt::material* material = nullptr;
};
// Pbrt lights
struct light {
// light parameters
frame3f frame = identity3x4f;
frame3f frend = identity3x4f;
vec3f emission = {0, 0, 0};
vec3f from = {0, 0, 0};
vec3f to = {0, 0, 0};
bool distant = false;
// arealight approximation
vec3f area_emission = {0, 0, 0};
frame3f area_frame = identity3x4f;
frame3f area_frend = identity3x4f;
std::vector<vec3i> area_triangles = {};
std::vector<vec3f> area_positions = {};
std::vector<vec3f> area_normals = {};
};
struct environment {
// environment approximation
frame3f frame = identity3x4f;
frame3f frend = identity3x4f;
vec3f emission = {0, 0, 0};
std::string emission_tex = "";
};
// Pbrt model
struct model {
// pbrt data
std::vector<std::string> comments = {};
std::vector<pbrt::camera*> cameras = {};
std::vector<pbrt::shape*> shapes = {};
std::vector<pbrt::environment*> environments = {};
std::vector<pbrt::light*> lights = {};
std::vector<pbrt::material*> materials = {};
// cleanup
~model();
};
// Load/save pbrt
inline bool load_pbrt(
const std::string& filename, pbrt::model* pbrt, std::string& error);
inline bool save_pbrt(const std::string& filename, pbrt::model* pbrt,
std::string& error, bool ply_meshes = false);
// Create pbrt
inline pbrt::camera* add_camera(pbrt::model* pbrt);
inline pbrt::shape* add_shape(pbrt::model* pbrt);
inline pbrt::material* add_material(pbrt::model* pbrt);
inline pbrt::environment* add_environment(pbrt::model* pbrt);
inline pbrt::light* add_light(pbrt::model* pbrt);
} // namespace yocto::pbrt
// -----------------------------------------------------------------------------
//
//
// IMPLEMENTATION
//
//
// -----------------------------------------------------------------------------
#include <cstdio>
#include <memory>
#include <string_view>
#include <unordered_set>
#include "ext/filesystem.hpp"
#include "yocto_ply.h"
namespace sfs = ghc::filesystem;
// -----------------------------------------------------------------------------
// ALIASES
// -----------------------------------------------------------------------------
namespace yocto::pbrt {
// string literals
using namespace std::string_literals;
} // namespace yocto::pbrt
// -----------------------------------------------------------------------------
// PBRT PARSING
// -----------------------------------------------------------------------------
namespace yocto::pbrt {
// utilities
inline bool is_newline(char c) { return c == '\r' || c == '\n'; }
inline bool is_space(char c) {
return c == ' ' || c == '\t' || c == '\r' || c == '\n';
}
inline void skip_whitespace(std::string_view& str) {
while (!str.empty() && is_space(str.front())) str.remove_prefix(1);
}
// Parse values from a std::string
[[nodiscard]] inline bool parse_value(
std::string_view& str, std::string_view& value) {
skip_whitespace(str);
if (str.empty()) return false;
if (str.front() != '"') {
auto cpy = str;
while (!cpy.empty() && !is_space(cpy.front())) cpy.remove_prefix(1);
value = str;
value.remove_suffix(cpy.size());
str.remove_prefix(str.size() - cpy.size());
} else {
if (str.front() != '"') return false;
str.remove_prefix(1);
if (str.empty()) return false;
auto cpy = str;
while (!cpy.empty() && cpy.front() != '"') cpy.remove_prefix(1);
if (cpy.empty()) return false;
value = str;
value.remove_suffix(cpy.size());
str.remove_prefix(str.size() - cpy.size());
str.remove_prefix(1);
}
return true;
}
[[nodiscard]] inline bool parse_value(
std::string_view& str, std::string& value) {
auto valuev = std::string_view{};
if (!parse_value(str, valuev)) return false;
value = std::string{valuev};
return true;
}
[[nodiscard]] inline bool parse_value(std::string_view& str, int& value) {
char* end = nullptr;
value = (int32_t)strtol(str.data(), &end, 10);
if (str.data() == end) return false;
str.remove_prefix(end - str.data());
return true;
}
[[nodiscard]] inline bool parse_value(std::string_view& str, float& value) {
char* end = nullptr;
value = strtof(str.data(), &end);
if (str.data() == end) return false;
str.remove_prefix(end - str.data());
return true;
}
[[nodiscard]] inline bool parse_value(std::string_view& str, vec2f& value) {
for (auto i = 0; i < 2; i++)
if (!parse_value(str, value[i])) return false;
return true;
}
[[nodiscard]] inline bool parse_value(std::string_view& str, vec3f& value) {
for (auto i = 0; i < 3; i++)
if (!parse_value(str, value[i])) return false;
return true;
}
[[nodiscard]] inline bool parse_value(std::string_view& str, vec4f& value) {
for (auto i = 0; i < 4; i++)
if (!parse_value(str, value[i])) return false;
return true;
}
[[nodiscard]] inline bool parse_value(std::string_view& str, mat4f& value) {
for (auto i = 0; i < 4; i++)
if (!parse_value(str, value[i])) return false;
return true;
}
// Formats values to std::string
inline void format_value(std::string& str, const std::string& value) {
str += value;
}
inline void format_value(std::string& str, const char* value) { str += value; }
inline void format_value(std::string& str, int value) {
char buf[256];
sprintf(buf, "%d", (int)value);
str += buf;
}
inline void format_value(std::string& str, float value) {
char buf[256];
sprintf(buf, "%g", value);
str += buf;
}
inline void format_value(std::string& str, const vec2f& value) {
for (auto i = 0; i < 2; i++) {
if (i) str += " ";
format_value(str, value[i]);
}
}
inline void format_value(std::string& str, const vec3f& value) {
for (auto i = 0; i < 3; i++) {
if (i) str += " ";
format_value(str, value[i]);
}
}
inline void format_value(std::string& str, const vec4f& value) {
for (auto i = 0; i < 4; i++) {
if (i) str += " ";
format_value(str, value[i]);
}
}
inline void format_value(std::string& str, const mat4f& value) {
for (auto i = 0; i < 4; i++) {
if (i) str += " ";
format_value(str, value[i]);
}
}
// Foramt to file
inline void format_values(std::string& str, const std::string& fmt) {
auto pos = fmt.find("{}");
if (pos != std::string::npos)
throw std::runtime_error("bad format std::string");
str += fmt;
}
template <typename Arg, typename... Args>
inline void format_values(std::string& str, const std::string& fmt,
const Arg& arg, const Args&... args) {
auto pos = fmt.find("{}");
if (pos == std::string::npos)
throw std::invalid_argument("bad format std::string");
str += fmt.substr(0, pos);
format_value(str, arg);
format_values(str, fmt.substr(pos + 2), args...);
}
template <typename... Args>
[[nodiscard]] inline bool format_values(
FILE* fs, const std::string& fmt, const Args&... args) {
auto str = ""s;
format_values(str, fmt, args...);
if (fputs(str.c_str(), fs) < 0) return false;
return true;
}
template <typename T>
[[nodiscard]] inline bool format_value(FILE* fs, const T& value) {
auto str = ""s;
format_value(str, value);
if (fputs(str.c_str(), fs) < 0) return false;
return true;
}
// Pbrt value
struct value {
// Pbrt value type
enum struct type_t {
// clang-format off
real, integer, boolean, string, point, normal, vector, texture, color,
point2, vector2, spectrum
// clang-format on
};
std::string name = "";
type_t type = type_t::real;
int value1i = 0;
float value1f = 0;
vec2f value2f = {0, 0};
vec3f value3f = {0, 0, 0};
bool value1b = false;
std::string value1s = "";
std::vector<float> vector1f = {};
std::vector<vec2f> vector2f = {};
std::vector<vec3f> vector3f = {};
std::vector<int> vector1i = {};
};
// Pbrt command
struct command {
std::string name = "";
std::string type = "";
std::vector<value> values = {};
frame3f frame = identity3x4f;
frame3f frend = identity3x4f;
};
// get pbrt value
[[nodiscard]] inline bool get_value(const value& pbrt, std::string& val) {
if (pbrt.type == value::type_t::string ||
pbrt.type == value::type_t::texture) {
val = pbrt.value1s;
return true;
} else {
return false;
}
}
[[nodiscard]] inline bool get_value(const value& pbrt, bool& val) {
if (pbrt.type == value::type_t::boolean) {
val = pbrt.value1b;
return true;
} else {
return false;
}
}
[[nodiscard]] inline bool get_value(const value& pbrt, int& val) {
if (pbrt.type == value::type_t::integer) {
val = pbrt.value1i;
return true;
} else {
return false;
}
}
[[nodiscard]] inline bool get_value(const value& pbrt, float& val) {
if (pbrt.type == value::type_t::real) {
val = pbrt.value1f;
return true;
} else {
return false;
}
}
[[nodiscard]] inline bool get_value(const value& pbrt, vec2f& val) {
if (pbrt.type == value::type_t::point2 ||
pbrt.type == value::type_t::vector2) {
val = pbrt.value2f;
return true;
} else {
return false;
}
}
[[nodiscard]] inline bool get_value(const value& pbrt, vec3f& val) {
if (pbrt.type == value::type_t::point || pbrt.type == value::type_t::vector ||
pbrt.type == value::type_t::normal || pbrt.type == value::type_t::color) {
val = pbrt.value3f;
return true;
} else if (pbrt.type == value::type_t::real) {
val = vec3f{pbrt.value1f};
return true;
} else {
return false;
}
}
[[nodiscard]] inline bool get_value(
const value& pbrt, std::vector<float>& val) {
if (pbrt.type == value::type_t::real) {
if (!pbrt.vector1f.empty()) {
val = pbrt.vector1f;
} else {
val = {pbrt.value1f};
}
return true;
} else {
return false;
}
}
[[nodiscard]] inline bool get_value(
const value& pbrt, std::vector<vec2f>& val) {
if (pbrt.type == value::type_t::point2 ||
pbrt.type == value::type_t::vector2) {
if (!pbrt.vector2f.empty()) {
val = pbrt.vector2f;
} else {
val = {pbrt.value2f};
}
return true;
} else if (pbrt.type == value::type_t::real) {
if (pbrt.vector1f.empty() || pbrt.vector1f.size() % 2)
throw std::runtime_error("bad pbrt type");
val.resize(pbrt.vector1f.size() / 2);
for (auto i = 0; i < val.size(); i++)
val[i] = {pbrt.vector1f[i * 2 + 0], pbrt.vector1f[i * 2 + 1]};
return true;
} else {
return false;
}
}
[[nodiscard]] inline bool get_value(
const value& pbrt, std::vector<vec3f>& val) {
if (pbrt.type == value::type_t::point || pbrt.type == value::type_t::vector ||
pbrt.type == value::type_t::normal || pbrt.type == value::type_t::color) {
if (!pbrt.vector3f.empty()) {
val = pbrt.vector3f;
} else {
val = {pbrt.value3f};
}
return true;
} else if (pbrt.type == value::type_t::real) {
if (pbrt.vector1f.empty() || pbrt.vector1f.size() % 3)
throw std::invalid_argument{"expected float3 array"};
val.resize(pbrt.vector1f.size() / 3);
for (auto i = 0; i < val.size(); i++)
val[i] = {pbrt.vector1f[i * 3 + 0], pbrt.vector1f[i * 3 + 1],
pbrt.vector1f[i * 3 + 2]};
return true;
} else {
return false;
}
}
[[nodiscard]] inline bool get_value(const value& pbrt, std::vector<int>& val) {
if (pbrt.type == value::type_t::integer) {
if (!pbrt.vector1i.empty()) {
val = pbrt.vector1i;
} else {
val = {pbrt.vector1i};
}
return true;
} else {
return false;
}
}
[[nodiscard]] inline bool get_value(
const value& pbrt, std::vector<vec3i>& val) {
if (pbrt.type == value::type_t::integer) {
if (pbrt.vector1i.empty() || pbrt.vector1i.size() % 3)
throw std::invalid_argument{"expected int3 array"};
val.resize(pbrt.vector1i.size() / 3);
for (auto i = 0; i < val.size(); i++)
val[i] = {pbrt.vector1i[i * 3 + 0], pbrt.vector1i[i * 3 + 1],
pbrt.vector1i[i * 3 + 2]};
return true;
} else {
return false;
}
}
[[nodiscard]] inline bool get_value(
const value& pbrt, std::pair<float, std::string>& val) {
if (pbrt.type == value::type_t::string ||
pbrt.type == value::type_t::texture) {
val.first = 0;
return get_value(pbrt, val.second);
} else {
val.second = "";
return get_value(pbrt, val.first);
}
}
[[nodiscard]] inline bool get_value(
const value& pbrt, std::pair<vec3f, std::string>& val) {
if (pbrt.type == value::type_t::string ||
pbrt.type == value::type_t::texture) {
val.first = zero3f;
return get_value(pbrt, val.second);
} else {
val.second = "";
return get_value(pbrt, val.first);
}
}
template <typename T>
[[nodiscard]] inline bool get_value(
const std::vector<value>& pbrt, const std::string& name, T& val) {
for (auto& p : pbrt) {
if (p.name == name) {
return get_value(p, val);
}
}
return true;
}
// pbrt value construction
inline value make_value(const std::string& name, const std::string& val,
value::type_t type = value::type_t::string) {
auto pbrt = value{};
pbrt.name = name;
pbrt.type = type;
pbrt.value1s = val;
return pbrt;
}
inline value make_value(const std::string& name, bool val,
value::type_t type = value::type_t::boolean) {
auto pbrt = value{};
pbrt.name = name;
pbrt.type = type;
pbrt.value1b = val;
return pbrt;
}
inline value make_value(const std::string& name, int val,
value::type_t type = value::type_t::integer) {
auto pbrt = value{};
pbrt.name = name;
pbrt.type = type;
pbrt.value1i = val;
return pbrt;
}
inline value make_value(const std::string& name, float val,
value::type_t type = value::type_t::real) {
auto pbrt = value{};
pbrt.name = name;
pbrt.type = type;
pbrt.value1f = val;
return pbrt;
}
inline value make_value(const std::string& name, const vec2f& val,
value::type_t type = value::type_t::point2) {
auto pbrt = value{};
pbrt.name = name;
pbrt.type = type;
pbrt.value2f = val;
return pbrt;
}
inline value make_value(const std::string& name, const vec3f& val,
value::type_t type = value::type_t::color) {
auto pbrt = value{};
pbrt.name = name;
pbrt.type = type;
pbrt.value3f = val;
return pbrt;
}
inline value make_value(const std::string& name, const std::vector<vec2f>& val,
value::type_t type = value::type_t::point2) {
auto pbrt = value{};
pbrt.name = name;
pbrt.type = type;
pbrt.vector2f = val;
return pbrt;
}
inline value make_value(const std::string& name, const std::vector<vec3f>& val,
value::type_t type = value::type_t::point) {
auto pbrt = value{};
pbrt.name = name;
pbrt.type = type;
pbrt.vector3f = val;
return pbrt;
}
inline value make_value(const std::string& name, const std::vector<vec3i>& val,
value::type_t type = value::type_t::integer) {
auto pbrt = value{};
pbrt.name = name;
pbrt.type = type;
pbrt.vector1i = {(int*)val.data(), (int*)val.data() + val.size() * 3};
return pbrt;
}
inline void remove_comment(std::string_view& str, char comment_char = '#') {
while (!str.empty() && is_newline(str.back())) str.remove_suffix(1);
auto cpy = str;
auto in_string = false;
while (!cpy.empty()) {
if (cpy.front() == '"') in_string = !in_string;
if (cpy.front() == comment_char && !in_string) break;
cpy.remove_prefix(1);
}
str.remove_suffix(cpy.size());
}
// Read a pbrt command from file
[[nodiscard]] inline bool read_cmdline(FILE* fs, std::string& cmd) {
char buffer[4096];
cmd.clear();
auto found = false;
auto pos = ftell(fs);
while (fgets(buffer, sizeof(buffer), fs)) {
// line
auto line = std::string_view{buffer};
remove_comment(line);
skip_whitespace(line);
if (line.empty()) continue;
// check if command
auto is_cmd = line[0] >= 'A' && line[0] <= 'Z';
if (is_cmd) {
if (found) {
fseek(fs, pos, SEEK_SET);
// line_num -= 1;
return true;
} else {
found = true;
}
} else if (!found) {
return false;
}
cmd += line;
cmd += " ";
pos = ftell(fs);
}
return found;
}
// parse a quoted std::string
[[nodiscard]] inline bool parse_command(
std::string_view& str, std::string& value) {
skip_whitespace(str);
if (!isalpha((int)str.front())) return false;
auto pos = str.find_first_not_of(
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz");
if (pos == std::string_view::npos) {
value.assign(str);
str.remove_prefix(str.size());
} else {
value.assign(str.substr(0, pos));
str.remove_prefix(pos + 1);
}
return true;
}
// parse pbrt value with optional parens
template <typename T>
[[nodiscard]] inline bool parse_param(std::string_view& str, T& value) {
skip_whitespace(str);
auto parens = !str.empty() && str.front() == '[';
if (parens) str.remove_prefix(1);
if (!parse_value(str, value)) return false;
if (!str.data()) return false;
if (parens) {
skip_whitespace(str);
if (!str.empty() && str.front() == '[') return false;
str.remove_prefix(1);
}
return true;
}
// parse a quoted std::string
[[nodiscard]] inline bool parse_nametype(
std::string_view& str_, std::string& name, std::string& type) {
auto value = ""s;
if (!parse_value(str_, value)) return false;
if (!str_.data()) return false;
auto str = std::string_view{value};
auto pos1 = str.find(' ');
if (pos1 == std::string_view::npos) return false;
type = std::string(str.substr(0, pos1));
str.remove_prefix(pos1);
auto pos2 = str.find_first_not_of(' ');
if (pos2 == std::string_view::npos) return false;
str.remove_prefix(pos2);
name = std::string(str);
return true;
}
inline std::pair<vec3f, vec3f> get_etak(const std::string& name) {
static const std::unordered_map<std::string, std::pair<vec3f, vec3f>>
metal_ior_table = {
{"a-C", {{2.9440999183f, 2.2271502925f, 1.9681668794f},
{0.8874329109f, 0.7993216383f, 0.8152862927f}}},
{"Ag", {{0.1552646489f, 0.1167232965f, 0.1383806959f},
{4.8283433224f, 3.1222459278f, 2.1469504455f}}},
{"Al", {{1.6574599595f, 0.8803689579f, 0.5212287346f},
{9.2238691996f, 6.2695232477f, 4.8370012281f}}},
{"AlAs", {{3.6051023902f, 3.2329365777f, 2.2175611545f},
{0.0006670247f, -0.0004999400f, 0.0074261204f}}},
{"AlSb", {{-0.0485225705f, 4.1427547893f, 4.6697691348f},
{-0.0363741915f, 0.0937665154f, 1.3007390124f}}},
{"Au", {{0.1431189557f, 0.3749570432f, 1.4424785571f},
{3.9831604247f, 2.3857207478f, 1.6032152899f}}},
{"Be", {{4.1850592788f, 3.1850604423f, 2.7840913457f},
{3.8354398268f, 3.0101260162f, 2.8690088743f}}},
{"Cr", {{4.3696828663f, 2.9167024892f, 1.6547005413f},
{5.2064337956f, 4.2313645277f, 3.7549467933f}}},
{"CsI", {{2.1449030413f, 1.7023164587f, 1.6624194173f},
{0.0000000000f, 0.0000000000f, 0.0000000000f}}},
{"Cu", {{0.2004376970f, 0.9240334304f, 1.1022119527f},
{3.9129485033f, 2.4528477015f, 2.1421879552f}}},
{"Cu2O", {{3.5492833755f, 2.9520622449f, 2.7369202137f},
{0.1132179294f, 0.1946659670f, 0.6001681264f}}},
{"CuO", {{3.2453822204f, 2.4496293965f, 2.1974114493f},
{0.5202739621f, 0.5707372756f, 0.7172250613f}}},
{"d-C", {{2.7112524747f, 2.3185812849f, 2.2288565009f},
{0.0000000000f, 0.0000000000f, 0.0000000000f}}},
{"Hg", {{2.3989314904f, 1.4400254917f, 0.9095512090f},
{6.3276269444f, 4.3719414152f, 3.4217899270f}}},
{"HgTe", {{4.7795267752f, 3.2309984581f, 2.6600252401f},
{1.6319827058f, 1.5808189339f, 1.7295753852f}}},
{"Ir", {{3.0864098394f, 2.0821938440f, 1.6178866805f},
{5.5921510077f, 4.0671757150f, 3.2672611269f}}},
{"K", {{0.0640493070f, 0.0464100621f, 0.0381842017f},
{2.1042155920f, 1.3489364357f, 0.9132113889f}}},
{"Li", {{0.2657871942f, 0.1956102432f, 0.2209198538f},
{3.5401743407f, 2.3111306542f, 1.6685930000f}}},
{"MgO", {{2.0895885542f, 1.6507224525f, 1.5948759692f},
{0.0000000000f, -0.0000000000f, 0.0000000000f}}},
{"Mo", {{4.4837010280f, 3.5254578255f, 2.7760769438f},
{4.1111307988f, 3.4208716252f, 3.1506031404f}}},
{"Na", {{0.0602665320f, 0.0561412435f, 0.0619909494f},
{3.1792906496f, 2.1124800781f, 1.5790940266f}}},
{"Nb", {{3.4201353595f, 2.7901921379f, 2.3955856658f},
{3.4413817900f, 2.7376437930f, 2.5799132708f}}},
{"Ni", {{2.3672753521f, 1.6633583302f, 1.4670554172f},
{4.4988329911f, 3.0501643957f, 2.3454274399f}}},
{"Rh", {{2.5857954933f, 1.8601866068f, 1.5544279524f},
{6.7822927110f, 4.7029501026f, 3.9760892461f}}},
{"Se-e", {{5.7242724833f, 4.1653992967f, 4.0816099264f},
{0.8713747439f, 1.1052845009f, 1.5647788766f}}},
{"Se", {{4.0592611085f, 2.8426947380f, 2.8207582835f},
{0.7543791750f, 0.6385150558f, 0.5215872029f}}},
{"SiC", {{3.1723450205f, 2.5259677964f, 2.4793623897f},
{0.0000007284f, -0.0000006859f, 0.0000100150f}}},
{"SnTe", {{4.5251865890f, 1.9811525984f, 1.2816819226f},
{0.0000000000f, 0.0000000000f, 0.0000000000f}}},
{"Ta", {{2.0625846607f, 2.3930915569f, 2.6280684948f},
{2.4080467973f, 1.7413705864f, 1.9470377016f}}},
{"Te-e", {{7.5090397678f, 4.2964603080f, 2.3698732430f},
{5.5842076830f, 4.9476231084f, 3.9975145063f}}},
{"Te", {{7.3908396088f, 4.4821028985f, 2.6370708478f},
{3.2561412892f, 3.5273908133f, 3.2921683116f}}},
{"ThF4", {{1.8307187117f, 1.4422274283f, 1.3876488528f},
{0.0000000000f, 0.0000000000f, 0.0000000000f}}},
{"TiC", {{3.7004673762f, 2.8374356509f, 2.5823030278f},
{3.2656905818f, 2.3515586388f, 2.1727857800f}}},
{"TiN", {{1.6484691607f, 1.1504482522f, 1.3797795097f},
{3.3684596226f, 1.9434888540f, 1.1020123347f}}},
{"TiO2-e", {{3.1065574823f, 2.5131551146f, 2.5823844157f},
{0.0000289537f, -0.0000251484f, 0.0001775555f}}},
{"TiO2", {{3.4566203131f, 2.8017076558f, 2.9051485020f},
{0.0001026662f, -0.0000897534f, 0.0006356902f}}},
{"VC", {{3.6575665991f, 2.7527298065f, 2.5326814570f},
{3.0683516659f, 2.1986687713f, 1.9631816252f}}},
{"VN", {{2.8656011588f, 2.1191817791f, 1.9400767149f},
{3.0323264950f, 2.0561075580f, 1.6162930914f}}},
{"V", {{4.2775126218f, 3.5131538236f, 2.7611257461f},
{3.4911844504f, 2.8893580874f, 3.1116965117f}}},
{"W", {{4.3707029924f, 3.3002972445f, 2.9982666528f},
{3.5006778591f, 2.6048652781f, 2.2731930614f}}},
};
return metal_ior_table.at(name);
}
// Pbrt measure subsurface parameters (sigma_prime_s, sigma_a in mm^-1)
// from pbrt code at pbrt/code/medium.cpp
inline std::pair<vec3f, vec3f> get_subsurface(const std::string& name) {
static const std::unordered_map<std::string, std::pair<vec3f, vec3f>> params =
{
// From "A Practical Model for Subsurface Light Transport"
// Jensen, Marschner, Levoy, Hanrahan
// Proc SIGGRAPH 2001
{"Apple", {{2.29, 2.39, 1.97}, {0.0030, 0.0034, 0.046}}},
{"Chicken1", {{0.15, 0.21, 0.38}, {0.015, 0.077, 0.19}}},
{"Chicken2", {{0.19, 0.25, 0.32}, {0.018, 0.088, 0.20}}},
{"Cream", {{7.38, 5.47, 3.15}, {0.0002, 0.0028, 0.0163}}},
{"Ketchup", {{0.18, 0.07, 0.03}, {0.061, 0.97, 1.45}}},
{"Marble", {{2.19, 2.62, 3.00}, {0.0021, 0.0041, 0.0071}}},
{"Potato", {{0.68, 0.70, 0.55}, {0.0024, 0.0090, 0.12}}},
{"Skimmilk", {{0.70, 1.22, 1.90}, {0.0014, 0.0025, 0.0142}}},
{"Skin1", {{0.74, 0.88, 1.01}, {0.032, 0.17, 0.48}}},
{"Skin2", {{1.09, 1.59, 1.79}, {0.013, 0.070, 0.145}}},
{"Spectralon", {{11.6, 20.4, 14.9}, {0.00, 0.00, 0.00}}},
{"Wholemilk", {{2.55, 3.21, 3.77}, {0.0011, 0.0024, 0.014}}},
// From "Acquiring Scattering Properties of Participating Media by
// Dilution",
// Narasimhan, Gupta, Donner, Ramamoorthi, Nayar, Jensen
// Proc SIGGRAPH 2006
{"Lowfat Milk",
{{0.89187, 1.5136, 2.532}, {0.002875, 0.00575, 0.0115}}},
{"Reduced Milk",
{{2.4858, 3.1669, 4.5214}, {0.0025556, 0.0051111, 0.012778}}},
{"Regular Milk",
{{4.5513, 5.8294, 7.136}, {0.0015333, 0.0046, 0.019933}}},
{"Espresso", {{0.72378, 0.84557, 1.0247}, {4.7984, 6.5751, 8.8493}}},
{"Mint Mocha Coffee",
{{0.31602, 0.38538, 0.48131}, {3.772, 5.8228, 7.82}}},
{"Lowfat Soy Milk",
{{0.30576, 0.34233, 0.61664}, {0.0014375, 0.0071875, 0.035937}}},
{"Regular Soy Milk",
{{0.59223, 0.73866, 1.4693}, {0.0019167, 0.0095833, 0.065167}}},
{"Lowfat Chocolate Milk",
{{0.64925, 0.83916, 1.1057}, {0.0115, 0.0368, 0.1564}}},
{"Regular Chocolate Milk",
{{1.4585, 2.1289, 2.9527}, {0.010063, 0.043125, 0.14375}}},
{"Coke", {{8.9053e-05, 8.372e-05, 0}, {0.10014, 0.16503, 0.2468}}},
{"Pepsi",
{{6.1697e-05, 4.2564e-05, 0}, {0.091641, 0.14158, 0.20729}}},
{"Sprite", {{6.0306e-06, 6.4139e-06, 6.5504e-06},
{0.001886, 0.0018308, 0.0020025}}},
{"Gatorade", {{0.0024574, 0.003007, 0.0037325},
{0.024794, 0.019289, 0.008878}}},
{"Chardonnay", {{1.7982e-05, 1.3758e-05, 1.2023e-05},
{0.010782, 0.011855, 0.023997}}},
{"White Zinfandel", {{1.7501e-05, 1.9069e-05, 1.288e-05},
{0.012072, 0.016184, 0.019843}}},
{"Merlot", {{2.1129e-05, 0, 0}, {0.11632, 0.25191, 0.29434}}},
{"Budweiser Beer", {{2.4356e-05, 2.4079e-05, 1.0564e-05},
{0.011492, 0.024911, 0.057786}}},
{"Coors Light Beer",
{{5.0922e-05, 4.301e-05, 0}, {0.006164, 0.013984, 0.034983}}},
{"Clorox", {{0.0024035, 0.0031373, 0.003991},
{0.0033542, 0.014892, 0.026297}}},
{"Apple Juice", {{0.00013612, 0.00015836, 0.000227},
{0.012957, 0.023741, 0.052184}}},
{"Cranberry Juice", {{0.00010402, 0.00011646, 7.8139e-05},
{0.039437, 0.094223, 0.12426}}},
{"Grape Juice", {{5.382e-05, 0, 0}, {0.10404, 0.23958, 0.29325}}},
{"Ruby Grapefruit Juice",
{{0.011002, 0.010927, 0.011036}, {0.085867, 0.18314, 0.25262}}},
{"White Grapefruit Juice",
{{0.22826, 0.23998, 0.32748}, {0.0138, 0.018831, 0.056781}}},
{"Shampoo", {{0.0007176, 0.0008303, 0.0009016},
{0.014107, 0.045693, 0.061717}}},
{"Strawberry Shampoo", {{0.00015671, 0.00015947, 1.518e-05},
{0.01449, 0.05796, 0.075823}}},
{"Head & Shoulders Shampoo",
{{0.023805, 0.028804, 0.034306}, {0.084621, 0.15688, 0.20365}}},
{"Lemon Tea Powder",
{{0.040224, 0.045264, 0.051081}, {2.4288, 4.5757, 7.2127}}},
{"Orange Powder", {{0.00015617, 0.00017482, 0.0001762},
{0.001449, 0.003441, 0.007863}}},
{"Pink Lemonade Powder", {{0.00012103, 0.00013073, 0.00012528},
{0.001165, 0.002366, 0.003195}}},
{"Cappuccino Powder",
{{1.8436, 2.5851, 2.1662}, {35.844, 49.547, 61.084}}},
{"Salt Powder",
{{0.027333, 0.032451, 0.031979}, {0.28415, 0.3257, 0.34148}}},
{"Sugar Powder", {{0.00022272, 0.00025513, 0.000271},
{0.012638, 0.031051, 0.050124}}},
{"Suisse Mocha Powder",
{{2.7979, 3.5452, 4.3365}, {17.502, 27.004, 35.433}}},
{"Pacific Ocean Surface Water", {{0.0001764, 0.00032095, 0.00019617},
{0.031845, 0.031324, 0.030147}}},
};
return params.at(name);
}
[[nodiscard]] inline bool parse_params(
std::string_view& str, std::vector<value>& values) {
auto parse_pvalues = [](std::string_view& str, auto& value,
auto& values) -> bool {
values.clear();
skip_whitespace(str);
if (str.empty()) return false;
if (str.front() == '[') {
str.remove_prefix(1);
skip_whitespace(str);
if (str.empty()) return false;
while (!str.empty()) {
auto& val = values.empty() ? value : values.emplace_back();
if (!parse_value(str, val)) return false;
if (!str.data()) return false;
skip_whitespace(str);
if (str.empty()) break;
if (str.front() == ']') break;
if (values.empty()) values.push_back(value);
}
if (str.empty()) return false;
if (str.front() != ']') return false;
str.remove_prefix(1);
return true;
} else {
return parse_value(str, value);
}
};
values.clear();
skip_whitespace(str);
while (!str.empty()) {
auto& value = values.emplace_back();
auto type = ""s;
if (!parse_nametype(str, value.name, type)) return false;
skip_whitespace(str);
if (str.empty()) return false;
if (type == "float") {
value.type = value::type_t::real;
if (!parse_pvalues(str, value.value1f, value.vector1f)) return false;
} else if (type == "integer") {
value.type = value::type_t::integer;
if (!parse_pvalues(str, value.value1i, value.vector1i)) return false;
} else if (type == "string") {
auto vector1s = std::vector<std::string>{};
value.type = value::type_t::string;
if (!parse_pvalues(str, value.value1s, vector1s)) return false;
if (!vector1s.empty()) return false;
} else if (type == "bool") {
auto value1s = ""s;
auto vector1s = std::vector<std::string>{};
value.type = value::type_t::boolean;
if (!parse_pvalues(str, value1s, vector1s)) return false;
if (!vector1s.empty()) return false;
value.value1b = value1s == "true";
} else if (type == "texture") {
auto vector1s = std::vector<std::string>{};
value.type = value::type_t::texture;
if (!parse_pvalues(str, value.value1s, vector1s)) return false;
if (!vector1s.empty()) return false;
} else if (type == "point" || type == "point3") {
value.type = value::type_t::point;
parse_pvalues(str, value.value3f, value.vector3f);
} else if (type == "normal" || type == "normal3") {
value.type = value::type_t::normal;
parse_pvalues(str, value.value3f, value.vector3f);
} else if (type == "std::vector" || type == "vector3") {
value.type = value::type_t::vector;
parse_pvalues(str, value.value3f, value.vector3f);
} else if (type == "point2") {
value.type = value::type_t::point2;
parse_pvalues(str, value.value2f, value.vector2f);
} else if (type == "vector2") {
value.type = value::type_t::vector2;
parse_pvalues(str, value.value2f, value.vector2f);
} else if (type == "blackbody") {
value.type = value::type_t::color;
auto blackbody = zero2f;
auto vector2f = std::vector<vec2f>{};
parse_pvalues(str, blackbody, vector2f);
if (!vector2f.empty()) return false;
value.value3f = math::blackbody_to_rgb(blackbody.x) * blackbody.y;