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Merge remote-tracking branch 'base/master'

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arvid schröder 2022-11-25 15:03:11 +01:00
commit d077b8981c
20 changed files with 793 additions and 200 deletions
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3
CMakeLists.txt
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@ -54,6 +54,9 @@ if("${CMAKE_CURRENT_LIST_DIR}/primitive/objmodel.cpp" IN_LIST primitive_src)
add_definitions(-DOBJMODEL_FOUND)
endif()
add_executable(tracey_ex4 ex4.cpp)
target_link_libraries(tracey_ex4 tracey)

202
common/brdfread.cpp Normal file
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@ -0,0 +1,202 @@
// Copyright 2005 Mitsubishi Electric Research Laboratories All Rights Reserved.
// Permission to use, copy and modify this software and its documentation without
// fee for educational, research and non-profit purposes, is hereby granted, provided
// that the above copyright notice and the following three paragraphs appear in all copies.
// To request permission to incorporate this software into commercial products contact:
// Vice President of Marketing and Business Development;
// Mitsubishi Electric Research Laboratories (MERL), 201 Broadway, Cambridge, MA 02139 or
// <license@merl.com>.
// IN NO EVENT SHALL MERL BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL,
// OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS, ARISING OUT OF THE USE OF THIS SOFTWARE AND
// ITS DOCUMENTATION, EVEN IF MERL HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
// MERL SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED
// HEREUNDER IS ON AN "AS IS" BASIS, AND MERL HAS NO OBLIGATIONS TO PROVIDE MAINTENANCE, SUPPORT,
// UPDATES, ENHANCEMENTS OR MODIFICATIONS.
#include "common/brdfread.h"
BRDFRead::BRDFRead(const char *filename) {
if (!readBrdf(filename)) {
std::cerr << "Cannot read BRDF file: " << filename << std::endl;
exit(0);
}
}
Color BRDFRead::lookupBrdfValues(double theta_in, double phi_in, double theta_out, double phi_out) {
// std::cerr << theta_in << "," << theta_out;
// Convert to halfangle / difference angle coordinates
double theta_half, phi_half, theta_diff, phi_diff;
std_coords_to_half_diff_coords(theta_in, phi_in, theta_out, phi_out, theta_half, phi_half, theta_diff, phi_diff);
// Find index.
// Note that phi_half is ignored, since isotropic BRDFs are assumed
int ind = phi_diff_index(phi_diff) + theta_diff_index(theta_diff) * BRDF_SAMPLING_RES_PHI_D / 2 +
theta_half_index(theta_half) * BRDF_SAMPLING_RES_PHI_D / 2 * BRDF_SAMPLING_RES_THETA_D;
Color color;
color.r = static_cast<float>(brdfData[ind] * RED_SCALE);
color.g = static_cast<float>(
brdfData[ind + BRDF_SAMPLING_RES_THETA_H * BRDF_SAMPLING_RES_THETA_D * BRDF_SAMPLING_RES_PHI_D / 2] *
GREEN_SCALE);
color.b = static_cast<float>(
brdfData[ind + BRDF_SAMPLING_RES_THETA_H * BRDF_SAMPLING_RES_THETA_D * BRDF_SAMPLING_RES_PHI_D] * BLUE_SCALE);
// std::cerr << red_val << "," <<green_val << "," << blue_val<< std::endl;
if (color.r < 0.0 || color.g < 0.0 || color.b < 0.0)
fprintf(stderr, "Below horizon.\n");
return color;
}
bool BRDFRead::readBrdf(const char *filename) {
FILE *f = fopen(filename, "rb");
if (!f)
return false;
int dims[3];
size_t numbytes = fread(dims, sizeof(int), 3, f);
if (numbytes == 0) {
return false;
}
int n = dims[0] * dims[1] * dims[2];
if (n != BRDF_SAMPLING_RES_THETA_H * BRDF_SAMPLING_RES_THETA_D * BRDF_SAMPLING_RES_PHI_D / 2) {
fprintf(stderr, "Dimensions don't match\n");
fclose(f);
return false;
}
brdfData = (double *)malloc(sizeof(double) * 3 * n);
numbytes = fread(brdfData, sizeof(double), 3 * n, f);
if (numbytes == 0) {
return false;
}
fclose(f);
return true;
}
void BRDFRead::cross_product(double *v1, double *v2, double *out) {
out[0] = v1[1] * v2[2] - v1[2] * v2[1];
out[1] = v1[2] * v2[0] - v1[0] * v2[2];
out[2] = v1[0] * v2[1] - v1[1] * v2[0];
}
void BRDFRead::normalize(double *v) {
// normalize
double len = sqrt(v[0] * v[0] + v[1] * v[1] + v[2] * v[2]);
v[0] = v[0] / len;
v[1] = v[1] / len;
v[2] = v[2] / len;
}
void BRDFRead::rotate_vector(double *vector, double *axis, double angle, double *out) {
double temp;
double cross[3];
double cos_ang = cos(angle);
double sin_ang = sin(angle);
out[0] = vector[0] * cos_ang;
out[1] = vector[1] * cos_ang;
out[2] = vector[2] * cos_ang;
temp = axis[0] * vector[0] + axis[1] * vector[1] + axis[2] * vector[2];
temp = temp * (1.0 - cos_ang);
out[0] += axis[0] * temp;
out[1] += axis[1] * temp;
out[2] += axis[2] * temp;
cross_product(axis, vector, cross);
out[0] += cross[0] * sin_ang;
out[1] += cross[1] * sin_ang;
out[2] += cross[2] * sin_ang;
}
void BRDFRead::std_coords_to_half_diff_coords(double theta_in, double phi_in, double theta_out, double phi_out,
double &theta_half, double &phi_half, double &theta_diff,
double &phi_diff) {
// compute in vector
double in_vec_z = cos(theta_in);
double proj_in_vec = sin(theta_in);
double in_vec_x = proj_in_vec * cos(phi_in);
double in_vec_y = proj_in_vec * sin(phi_in);
double in[3] = {in_vec_x, in_vec_y, in_vec_z};
normalize(in);
// compute out vector
double out_vec_z = cos(theta_out);
double proj_out_vec = sin(theta_out);
double out_vec_x = proj_out_vec * cos(phi_out);
double out_vec_y = proj_out_vec * sin(phi_out);
double out[3] = {out_vec_x, out_vec_y, out_vec_z};
normalize(out);
// compute halfway vector
double half_x = (in_vec_x + out_vec_x) / 2.0f;
double half_y = (in_vec_y + out_vec_y) / 2.0f;
double half_z = (in_vec_z + out_vec_z) / 2.0f;
double half[3] = {half_x, half_y, half_z};
normalize(half);
// compute theta_half, phi_half
theta_half = acos(half[2]);
phi_half = atan2(half[1], half[0]);
double bi_normal[3] = {0.0, 1.0, 0.0};
double normal[3] = {0.0, 0.0, 1.0};
double temp[3];
double diff[3];
// compute diff vector
rotate_vector(in, normal, -phi_half, temp);
rotate_vector(temp, bi_normal, -theta_half, diff);
// compute theta_diff, phi_diff
theta_diff = acos(diff[2]);
phi_diff = atan2(diff[1], diff[0]);
}
int BRDFRead::theta_half_index(double theta_half) {
if (theta_half <= 0.0)
return 0;
double theta_half_deg = ((theta_half / (M_PI / 2.0)) * BRDF_SAMPLING_RES_THETA_H);
double temp = theta_half_deg * BRDF_SAMPLING_RES_THETA_H;
temp = sqrt(temp);
int ret_val = (int)temp;
if (ret_val < 0)
ret_val = 0;
if (ret_val >= BRDF_SAMPLING_RES_THETA_H)
ret_val = BRDF_SAMPLING_RES_THETA_H - 1;
return ret_val;
}
int BRDFRead::theta_diff_index(double theta_diff) {
int tmp = int(theta_diff / (M_PI * 0.5) * BRDF_SAMPLING_RES_THETA_D);
if (tmp < 0)
return 0;
else if (tmp < BRDF_SAMPLING_RES_THETA_D - 1)
return tmp;
else
return BRDF_SAMPLING_RES_THETA_D - 1;
}
int BRDFRead::phi_diff_index(double phi_diff) {
// Because of reciprocity, the BRDF is unchanged under
// phi_diff -> phi_diff + M_PI
if (phi_diff < 0.0)
phi_diff += M_PI;
// In: phi_diff in [0 .. pi]
// Out: tmp in [0 .. 179]
int tmp = int(phi_diff / M_PI * BRDF_SAMPLING_RES_PHI_D / 2);
if (tmp < 0)
return 0;
else if (tmp < BRDF_SAMPLING_RES_PHI_D / 2 - 1)
return tmp;
else
return BRDF_SAMPLING_RES_PHI_D / 2 - 1;
}

100
common/brdfread.h Normal file
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@ -0,0 +1,100 @@
// Copyright 2005 Mitsubishi Electric Research Laboratories All Rights Reserved.
// Permission to use, copy and modify this software and its documentation without
// fee for educational, research and non-profit purposes, is hereby granted, provided
// that the above copyright notice and the following three paragraphs appear in all copies.
// To request permission to incorporate this software into commercial products contact:
// Vice President of Marketing and Business Development;
// Mitsubishi Electric Research Laboratories (MERL), 201 Broadway, Cambridge, MA 02139 or
// <license@merl.com>.
// IN NO EVENT SHALL MERL BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL,
// OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS, ARISING OUT OF THE USE OF THIS SOFTWARE AND
// ITS DOCUMENTATION, EVEN IF MERL HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
// MERL SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED
// HEREUNDER IS ON AN "AS IS" BASIS, AND MERL HAS NO OBLIGATIONS TO PROVIDE MAINTENANCE, SUPPORT,
// UPDATES, ENHANCEMENTS OR MODIFICATIONS.
// The Implementation has been moved to "brdfread.cpp" for compatibility
#ifndef BRDFREAD_H
#define BRDFREAD_H
#include <cmath>
#include <common/color.h>
#include <cstdlib>
#include <iostream>
#define BRDF_SAMPLING_RES_THETA_H 90
#define BRDF_SAMPLING_RES_THETA_D 90
#define BRDF_SAMPLING_RES_PHI_D 360
#define RED_SCALE (1.0 / 1500.0)
#define GREEN_SCALE (1.15 / 1500.0)
#define BLUE_SCALE (1.66 / 1500.0)
#ifndef M_PI
#define M_PI 3.1415926535897932384626433832795
#endif
class BRDFRead {
public:
BRDFRead(const char *filename);
/**
* Given a pair of incoming/outgoing angles, look up the BRDF.
*/
Color lookupBrdfValues(double theta_in, double phi_in, double theta_out, double phi_out);
private:
/**
* Read BRDF data
*/
bool readBrdf(const char *filename);
/**
* cross product of two vectors
*/
void cross_product(double *v1, double *v2, double *out);
/**
* normalize vector
*/
void normalize(double *v);
/**
* rotate vector along one axis
*/
void rotate_vector(double *vector, double *axis, double angle, double *out);
/**
* convert standard coordinates to half vector/difference vector coordinates
*/
void std_coords_to_half_diff_coords(double theta_in, double phi_in, double theta_out, double phi_out,
double &theta_half, double &phi_half, double &theta_diff, double &phi_diff);
/**
* Lookup theta_half index
* This is a non-linear mapping!
* In: [0 .. pi/2]
* Out: [0 .. 89]
*/
inline int theta_half_index(double theta_half);
/**
* Lookup theta_diff index
* In: [0 .. pi/2]
* Out: [0 .. 89]
*/
inline int theta_diff_index(double theta_diff);
/**
* Lookup phi_diff index
*/
inline int phi_diff_index(double phi_diff);
double *brdfData;
};
#endif

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ex4.cpp Normal file
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#include <iostream>
#include <string>
#include "camera/perspectivecamera.h"
#include "renderer/simplerenderer.h"
#include "scene/simplescene.h"
#include "primitive/box.h"
#include "primitive/infiniteplane.h"
#include "primitive/objmodel.h"
#include "primitive/sphere.h"
#include "shader/brdfshader.h"
#include "shader/lambertshader.h"
#include "shader/mirrorshader.h"
#include "shader/phongshader.h"
#include "shader/cooktorranceshader.h"
#include "light/ambientlight.h"
#include "light/pointlight.h"
#include "light/spotlight.h"
int main() {
// Let's create a simple scene...
SimpleScene scene;
// Add shaders
auto mirror = std::make_shared<MirrorShader>();
auto white = std::make_shared<LambertShader>(Color(0.9f, 0.9f, 0.9f));
auto red = std::make_shared<LambertShader>(Color(1.0f, 0.3f, 0.2f));
auto blue = std::make_shared<LambertShader>(Color(0.2f, 0.3f, 1.0f));
auto orange = std::make_shared<PhongShader>(Color(1.0f, 0.64f, 0.0f), 1.0f, Color(1.0f, 1.0f, 1.0f), 1.0f, 25.0f);
auto gold= std::make_shared<CookTorranceShader>(Color(0.83f, 0.69f, 0.22f), Color(1.0f, 1.0f, 0.0f), 1.2f, 0.2f);
auto blueMetallic = std::make_shared<BrdfShader>("data/blue-metallic-paint.binary", Color(7.0f, 7.0f, 7.0f));
auto darkRed = std::make_shared<BrdfShader>("data/dark-red-paint.binary", Color(7.0f, 7.0f, 7.0f));
// Set up the walls
// ---------------------------------------------------------------------------
scene.add(std::make_shared<InfinitePlane>(Vector3d(0.0f, 0.0f, +5.0f), Vector3d(0.0f, 0.0f, -1.0f), mirror));
scene.add(std::make_shared<InfinitePlane>(Vector3d(0.0f, 0.0f, -5.0f), Vector3d(0.0f, 0.0f, +1.0f), mirror));
scene.add(std::make_shared<InfinitePlane>(Vector3d(0.0f, +5.0f, 0.0f), Vector3d(0.0f, -1.0f, 0.0f), white));
scene.add(std::make_shared<InfinitePlane>(Vector3d(0.0f, -5.0f, 0.0f), Vector3d(0.0f, +1.0f, 0.0f), white));
scene.add(std::make_shared<InfinitePlane>(Vector3d(+5.0f, 0.0f, 0.0f), Vector3d(-1.0f, 0.0f, 0.0f), blue));
scene.add(std::make_shared<InfinitePlane>(Vector3d(-5.0f, 0.0f, 0.0f), Vector3d(+1.0f, 0.0f, 0.0f), red));
scene.add(std::make_shared<Sphere>(Vector3d(-3.0f, 0.0f, 0.0f), 1.0f, blueMetallic));
scene.add(std::make_shared<Sphere>(Vector3d(0.0f, 2.0f, 0.0f), 1.0f, orange));
scene.add(std::make_shared<Sphere>(Vector3d(3.0f, 0.0f, 0.0f), 1.0f, darkRed));
// Add the teapot
auto teapot = std::make_shared<ObjModel>(gold);
teapot->loadObj("data/teapot.obj", Vector3d(3.0f, 3.0f, 3.0f), Vector3d(0.0f, -5.0f, 0.0f));
scene.add(teapot);
// Add ambient light
scene.add(std::make_shared<AmbientLight>(0.15f));
scene.add(std::make_shared<PointLight>(Vector3d(0.0f, 4.0f, -4.0f), 15.0f));
scene.add(std::make_shared<PointLight>(Vector3d(0.0f, 4.0f, 4.0f), 15.0f));
// Set up the camera
PerspectiveCamera camera;
camera.setFovAngle(90.0f);
camera.setPosition(Vector3d(0.0f, 0.0f, -10.0f));
camera.setForwardDirection(Vector3d(0.0f, 0.0f, 1.0f));
camera.setUpDirection(Vector3d(0.0f, 1.0f, 0.0f));
// Render the scene
SimpleRenderer renderer;
renderer.renderImage(scene, camera, 512, 512).save("result.png");
return 0;
}

29
light/ambientlight.cpp
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@ -1,32 +1,5 @@
//
// Created by marcel on 21.11.22.
//
#include "light/ambientlight.h"
#include "scene/scene.h"
AmbientLight::AmbientLight(float intensity, const Color &color) : Light(intensity, color) {}
Light::Illumination AmbientLight::illuminate(Scene const &scene, Ray const &ray) const {
Vector3d const target = ray.origin + (ray.length - LGT_EPS) * ray.direction;
Illumination illum;
illum.direction = -ray.normal;
// Precompute the distance from the light source
float const distance = length(ray.normal);
// Define a secondary ray from the surface point to the light source.
Ray lightRay;
lightRay.origin = target;
lightRay.direction = -illum.direction;
lightRay.length = distance - LGT_EPS;
// If the target is not in shadow...
if (!scene.findOcclusion(lightRay))
// ... compute the attenuation and light color
illum.color = 1.0f / (distance * distance) * this->color * this->intensity;
return illum;
return illum;
return {this->color * this->intensity, -ray.normal};
}

22
light/ambientlight.h
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@ -1,22 +1,16 @@
//
// Created by marcel on 21.11.22.
//
#ifndef CG1_TRACER_AMBIENTLIGHT_H
#define CG1_TRACER_AMBIENTLIGHT_H
#ifndef AMBIENTLIGHT_H
#define AMBIENTLIGHT_H
#include "light/light.h"
class AmbientLight : public Light{
class AmbientLight : public Light {
public:
explicit AmbientLight(float intensity, Color const &color = Color(1, 1, 1));
// Constructor
AmbientLight(float intensity, Color color = Color(1, 1, 1)) : Light(intensity, color) {}
Illumination illuminate(Scene const &scene, Ray const &ray) const override;
protected:
Vector3d direction;
// Light functions
Illumination illuminate(Scene const &scene, Ray const &ray) const override;
};
#endif //CG1_TRACER_AMBIENTLIGHT_H
#endif

61
light/spotlight.cpp
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@ -1,45 +1,38 @@
#include "light/spotlight.h"
#include "scene/scene.h"
SpotLight::SpotLight(Vector3d position, Vector3d direction, float innerAngle, float outerAngle, float intensity,
const Color &color) : Light(intensity, color), position(position), direction(direction),
innerAngle(innerAngle), outerAngle(outerAngle) {};
SpotLight::SpotLight(Vector3d const &position, Vector3d const &direction, float alphaMin, float alphaMax, float intensity, Color const &color)
: Light(intensity, color), position(position), direction(normalized(direction)), alphaMin(alphaMin), alphaMax(alphaMax) {}
Light::Illumination SpotLight::illuminate(Scene const &scene, Ray const &ray) const {
// Calculate distance to surface
Vector3d const x = ray.origin + (ray.length - SPLT_EPS) * ray.direction;
Vector3d const target = ray.origin + (ray.length - LGT_EPS) * ray.direction;
// Illumination object
Illumination illum;
illum.direction = normalized(x - this->position);
// Illumination object
Illumination illum;
illum.direction = normalized(target - this->position);
// Precompute the distance from the light source
float const distance = length(x - this->position);
// Precompute the distance from the light source
float const distance = length(target - this->position);
// Define a secondary ray from the surface point to the light source.
Ray lightRay;
lightRay.origin = x;
lightRay.direction = -illum.direction;
lightRay.length = distance - SPLT_EPS;
// Define a secondary ray from the surface point to the light source
Ray lightRay;
lightRay.origin = target;
lightRay.direction = -illum.direction;
lightRay.length = distance - LGT_EPS;
//calculate angle
float angle = acos(dotProduct(x - this->position, this->direction) / (length(x - this->position)
* length(this->direction)));
// Determine the angle of the inner cone
float const alpha = std::fabs(std::acos(dotProduct(illum.direction, this->direction)) * 180.0f / float(PI));
if (!scene.findOcclusion(lightRay)) { // If the target is not in shadow...
// ... compute the attenuation and light color
if (angle > outerAngle * (PI / 180)) {
illum.color = Color(0, 0, 0);
} else if (angle > innerAngle * (PI / 180)) {
float outerIllumRange = (outerAngle - innerAngle) * (PI / 180);
float leftOverAngle = angle - innerAngle * (PI / 180);
float percentageOfAngle = leftOverAngle / outerIllumRange;
float illumValue = 1 - percentageOfAngle;
illum.color = (1.0f / (distance * distance) * this->color * this->intensity) * illumValue;
} else {
illum.color = 1.0f / (distance * distance) * this->color * this->intensity;
}
// If the target is within the cone...
if (this->alphaMax > alpha) {
// ... and not in shadow ...
if (!scene.findOcclusion(lightRay)) {
// ... compute the attenuation and light color ...
illum.color = 1.0f / (distance * distance) * this->color * this->intensity;
// ... then compute the falloff towards the edge of the cone
if (this->alphaMin < alpha)
illum.color *= 1.0f - (alpha - this->alphaMin) / (this->alphaMax - this->alphaMin);
}
return illum;
}
}
return illum;
}

28
light/spotlight.h
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@ -1,21 +1,27 @@
#ifndef CG1_TRACER_SPOTLIGHT_H
#define CG1_TRACER_SPOTLIGHT_H
#ifndef SPOTLIGHT_H
#define SPOTLIGHT_H
#include "light/light.h"
class SpotLight : public Light{
class SpotLight : public Light {
public:
SpotLight(Vector3d position, Vector3d direction, float innerAngle, float outerAngle,float intensity, Color const &color = Color(1, 1, 1));
// Constructor
SpotLight(Vector3d const &position, Vector3d const &direction, float alphaMin, float alphaMax, float intensity,
Color const &color = Color(1, 1, 1));
Illumination illuminate(Scene const &scene, Ray const &ray) const override;
// Set
void setDirection(Vector3d const &direction) { this->direction = normalized(direction); }
void setPosition(Vector3d const &position) { this->position = position; }
void setAlphaMax(float alphaMax) { this->alphaMax = alphaMax; }
void setAlphaMin(float alphaMin) { this->alphaMin = alphaMin; }
// Light functions
Illumination illuminate(Scene const &scene, Ray const &ray) const override;
protected:
Vector3d direction;
Vector3d position;
float innerAngle;
float outerAngle;
Vector3d position, direction;
float alphaMin, alphaMax;
};
#endif //CG1_TRACER_SPOTLIGHT_H
#endif

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primitive/objmodel.cpp
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@ -1,60 +1,43 @@
#include "objmodel.h"
#include "shader/flatshader.h"
#include "../scene/scene.h"
#include "primitive/objmodel.h"
#include "primitive/box.h"
#include "primitive/triangle.h"
#include "scene/scene.h"
void ObjModel::loadObj(const char* fileName, Vector3d scale, Vector3d translation) {
ObjModel::ObjModel(std::shared_ptr<Shader> const &shader) : Primitive(shader), boundingBox(Vector3d(-INFINITY, -INFINITY, -INFINITY), Vector3d(INFINITY, INFINITY, INFINITY), shader) {}
this->faces = (Scene::loadObj(fileName, scale, translation, this->shader()));
void ObjModel::loadObj(char const *fileName, Vector3d const &scale, Vector3d const &translation) {
// Load faces
this->primitives = Scene::loadObj(fileName, scale, translation, shader());
Vector3d minBounds;
Vector3d maxBounds;
// Extent of box
Vector3d minVert(INFINITY, INFINITY, INFINITY);
Vector3d maxVert(-INFINITY, -INFINITY, -INFINITY);
auto minCalc = [this](int dimension) {
return std::min_element(this->faces.begin(),
this->faces.end(),
[&dimension](auto &face1, auto &face2) {
return face1->minimumBounds(dimension) < face2->minimumBounds(dimension);
})->get()->minimumBounds(dimension);
};
minBounds = {minCalc(0), minCalc(1), minCalc(2)};
auto maxCalc = [this](int dimension) {
return std::max_element(this->faces.begin(),
this->faces.end(),
[&dimension](auto &face1, auto &face2) {
return face1->maximumBounds(dimension) < face2->maximumBounds(dimension);
})->get()->maximumBounds(dimension);
};
maxBounds = {maxCalc(0), maxCalc(1), maxCalc(2)};
boundingBox.setCenter(minBounds + (maxBounds - minBounds) / 2);
boundingBox.setSize(maxBounds - minBounds);
// For each face, update the extent
for (const auto &primitive : this->primitives) {
minVert = Vector3d(std::min(minVert.x, primitive->minimumBounds(0)), std::min(minVert.y, primitive->minimumBounds(1)), std::min(minVert.z, primitive->minimumBounds(2)));
maxVert = Vector3d(std::max(maxVert.x, primitive->maximumBounds(0)), std::max(maxVert.y, primitive->maximumBounds(1)), std::max(maxVert.z, primitive->maximumBounds(2)));
}
// Update the bounding box
boundingBox.setCenter(0.5f * (maxVert + minVert));
boundingBox.setSize(maxVert - minVert + Vector3d(SPLT_EPS, SPLT_EPS, SPLT_EPS));
}
bool ObjModel::intersect(Ray &ray) const {
auto testRay = Ray(ray.origin, ray.direction);
if (!boundingBox.intersect(testRay)) {
return false;
// Ray box intersection
Ray boxRay = ray;
if (boundingBox.intersect(boxRay)) {
// ray primitive intersection
bool hit = false;
for (const auto &p : this->primitives) {
hit |= p->intersect(ray);
}
return std::count_if(this->faces.begin(),
this->faces.end(),
[&ray](auto &face) {
return face->intersect(ray);
}) > 0;
}
float ObjModel::minimumBounds(int dimension) const {
return this->boundingBox.minimumBounds(dimension);
}
float ObjModel::maximumBounds(int dimension) const {
return this->boundingBox.maximumBounds(dimension);
}
ObjModel::ObjModel(const std::shared_ptr<Shader> &shader) :
Primitive(shader),
boundingBox(Box(std::make_shared<FlatShader>(Color(0, 0, 0)))) {
return hit;
}
return false;
}
float ObjModel::minimumBounds(int dimension) const { return this->boundingBox.minimumBounds(dimension); }
float ObjModel::maximumBounds(int dimension) const { return this->boundingBox.maximumBounds(dimension); }

32
primitive/objmodel.h
View file

@ -1,25 +1,29 @@
#ifndef CG1_TRACER_OBJMODEL_H
#define CG1_TRACER_OBJMODEL_H
#ifndef OBJMODEL_H
#define OBJMODEL_H
#include "primitive.h"
#include "box.h"
#include "primitive/box.h"
#include <vector>
class ObjModel : public Primitive {
public:
explicit ObjModel(const std::shared_ptr<Shader> &shader);
void loadObj(const char* fileName, Vector3d scale, Vector3d translation);
// Constructor
ObjModel(std::shared_ptr<Shader> const &shader);
~ObjModel() override{};
bool intersect(Ray &ray) const override;
// Load object data
void loadObj(char const *fileName, Vector3d const &scale = Vector3d(1, 1, 1),
Vector3d const &translation = Vector3d(0, 0, 0));
[[nodiscard]] float minimumBounds(int dimension) const override;
[[nodiscard]] float maximumBounds(int dimension) const override;
// Primitive functions
bool intersect(Ray &ray) const override;
// Bounding box
float minimumBounds(int dimension) const override;
float maximumBounds(int dimension) const override;
protected:
std::vector<std::shared_ptr<Primitive>> faces;
Box boundingBox;
Box boundingBox;
std::vector<std::shared_ptr<Primitive>> primitives;
};
#endif //CG1_TRACER_OBJMODEL_H
#endif

11
primitive/triangle.cpp
View file

@ -111,14 +111,9 @@ bool Triangle::intersect(Ray &ray) const {
if (t < EPSILON || ray.length < t)
return false;
// Calculate the normal
if (this->normal[0] == Vector3d(0, 0, 0)
|| this->normal[1] == Vector3d(0, 0, 0)
|| this->normal[2] == Vector3d(0, 0, 0)) {
ray.normal = normalized(crossProduct(edge1, edge2));
} else {
ray.normal = normalized(u * normalized(this->normal[1]) + v * normalized(this->normal[2]) + (1 - u - v) * normalized(this->normal[0]));
}
// Calculate the normal
// IMPLEMENT smooth triangles, if available
ray.normal = normalized(crossProduct(edge1, edge2));
// Calculate the surface position
ray.surface = u * this->surface[1] + v * this->surface[2] + (1 - u - v) * this->surface[0];

204
scene/scene.cpp
View file

@ -42,49 +42,167 @@ std::vector<std::shared_ptr<Primitive>> Scene::loadObj(char const *fileName, Vec
std::vector<std::shared_ptr<Primitive>> faces;
std::vector<std::array<int, 3>> indices;
std::vector<Vector3d> vertices;
std::vector<Vector3d> vertex_normals;
std::ifstream file;
file.open(fileName);
if (file.is_open()) {
while (!file.eof()) {
std::string key;
file >> key;
if (key == "v") {
float x, y, z;
file >> x >> y >> z;
vertices.emplace_back(x, y, z);
} else if (key == "vn") {
float x, y, z;
file >> x >> y >> z;
vertex_normals.emplace_back(x, y, z);
} else if (key == "f") {
int x, y, z,
xn, yn, zn = 0;
{
std::string token;
std::getline(file, token, '/');
std::stringstream tokens(token);
tokens >> x;
}
file.ignore(1);
file >> xn;
{
std::string token;
std::getline(file, token, '/');
std::stringstream tokens(token);
tokens >> y;
}
file.ignore(1);
file >> yn;
{
std::string token;
std::getline(file, token, '/');
std::stringstream tokens(token);
tokens >> z;
}
file.ignore(1);
file >> zn;
// Open file from disk
std::ifstream file;
file.open(fileName);
if (!file.is_open()) {
std::cout << "(Scene): Could not open .obj file: " << fileName << std::endl;
return std::vector<std::shared_ptr<Primitive>>();
}
// Print the file name
std::cout << "(Scene): Loading \"" << fileName << "\"" << std::endl;
// Actual model data
std::vector<Vector3d> vData;
std::vector<Vector3d> tangentData;
std::vector<Vector3d> bitangentData;
std::vector<Vector3d> normalData;
std::vector<Vector3d> vnData;
std::vector<Vector2d> vtData;
// Read vertices, normals, textures, and faces from the file
std::string line;
while (getline(file, line)) {
std::stringstream lineStream(trim(line));
std::string type;
lineStream >> type;
// Vertices
if (type == "v") {
float x, y, z;
lineStream >> x >> y >> z;
vData.emplace_back(componentProduct(Vector3d(x, y, z), scale) + translation);
tangentData.emplace_back();
bitangentData.emplace_back();
normalData.emplace_back();
}
// Texture coordinates
if (type == "vt") {
float u, v;
lineStream >> u >> v;
vtData.emplace_back(flipU ? 1.0f - u : u, flipV ? 1.0f - v : v);
}
// Normals
if (type == "vn") {
float a, b, c;
lineStream >> a >> b >> c;
vnData.emplace_back(normalized(componentQuotient(
Vector3d(a, b, c),
scale))); // Division needed for preventing stretched normals, normals' = (transform^-1)^T * normals
}
// Faces
if (type == "f") {
std::string vertex[3];
std::array<int, 3> vertInd = {-1, -1, -1};
std::array<int, 3> texInd = {-1, -1, -1};
std::array<int, 3> normInd = {-1, -1, -1};
lineStream >> vertex[0] >> vertex[1] >> vertex[2];
// triangulate polygons, like quads (which must be given in triangle fan notation)
while (!vertex[2].empty()) {
auto triangle = std::make_shared<Triangle>(shader);
for (int i = 0; i < 3; ++i) {
std::stringstream vertexSteam(vertex[i]);
std::string reference;
// vertex index
getline(vertexSteam, reference, '/');
try {
vertInd[i] = stoi(reference) - 1;
triangle->setVertex(i, vData.at(vertInd[i]));
} catch (...) {
std::cout << "Error: vertex index invalid on line \"" << line << "\"" << std::endl;
}
// texture index
if (getline(vertexSteam, reference, '/')) {
if (!reference.empty()) {
try {
texInd[i] = stoi(reference) - 1;
triangle->setSurface(i, vtData.at(texInd[i]));
} catch (...) {
std::cout << "Error: texture coordinate index invalid on line \"" << line << "\"" << std::endl;
}
}
// normal index
if (getline(vertexSteam, reference, '/')) {
try {
normInd[i] = stoi(reference) - 1;
triangle->setNormal(i, vnData.at(normInd[i]));
} catch (...) {
std::cout << "Error: normal index invalid on line \"" << line << "\"" << std::endl;
}
}
}
}
// calculate and accumulate tangent and bitangent vectors
if (std::all_of(vertInd.begin(), vertInd.end(), [](int i) { return i > -1; }) &&
std::all_of(texInd.begin(), texInd.end(), [](int i) { return i > -1; })) {
for (int i = 0; i < 3; i++) {
const Vector3d deltaPos1 = vData.at(vertInd[(i + 1) % 3]) - vData.at(vertInd[i]);
const Vector3d deltaPos2 = vData.at(vertInd[(i + 2) % 3]) - vData.at(vertInd[i]);
const Vector2d deltaUV1 = vtData.at(texInd[(i + 1) % 3]) - vtData.at(texInd[i]);
const Vector2d deltaUV2 = vtData.at(texInd[(i + 2) % 3]) - vtData.at(texInd[i]);
const float r = 1.0f / (deltaUV1.u * deltaUV2.v - deltaUV1.v * deltaUV2.u);
tangentData[vertInd[i]] += (deltaPos1 * deltaUV2.v - deltaPos2 * deltaUV1.v) * r;
bitangentData[vertInd[i]] += (deltaPos2 * deltaUV1.u - deltaPos1 * deltaUV2.u) * r;
normalData[vertInd[i]] += crossProduct(tangentData[vertInd[i]], bitangentData[vertInd[i]]);
}
}
faces.push_back(triangle);
indices.push_back(vertInd);
// get the next triangle
if (lineStream.eof())
break;
vertex[1] = vertex[2];
lineStream >> vertex[2];
}
}
}
// Close the file
file.close();
// set the normalized tangents and bitangents
for (int i = 0; i < faces.size(); i++) {
for (int j = 0; j < 3; j++) {
Vector3d tangent = normalized(tangentData[indices[i][j]]);
const Vector3d bitangent = normalized(bitangentData[indices[i][j]]);
// try to use the normal from the obj file, if it doesn't exist, use the computed normal
Vector3d normal = normalized(normalData[indices[i][j]]);
if (vnData.size() > 0)
normal = dynamic_cast<Triangle *>(faces[i].get())->getNormal(j);
// gram-schmidt orthogonalization
tangent = normalized(tangent - normal * dotProduct(normal, tangent));
// check handedness of coordinate system
if (dotProduct(crossProduct(normal, tangent), bitangent) < 0.0f)
tangent *= -1.0f;
dynamic_cast<Triangle *>(faces[i].get())->setTangent(j, tangent);
dynamic_cast<Triangle *>(faces[i].get())->setBitangent(j, bitangent);
dynamic_cast<Triangle *>(faces[i].get())->setNormal(j, normal);
}
}
// Debug output
std::cout << " -> " << vData.size() << " vertices parsed" << std::endl;
std::cout << " -> " << vnData.size() << " normals parsed" << std::endl;
std::cout << " -> " << vtData.size() << " uv-positions parsed" << std::endl;
std::cout << " -> " << faces.size() << " primitives parsed" << std::endl;
faces.push_back(std::make_shared<Triangle>(vertices[x - 1] * scale + translation,
vertices[y - 1] * scale + translation,

13
shader/brdfshader.cpp Normal file
View file

@ -0,0 +1,13 @@
#include "light/light.h"
#include "scene/scene.h"
#include "shader/brdfshader.h"
BrdfShader::BrdfShader(char const *fileName, Color const &scale)
: scale(scale), brdf(std::make_unique<BRDFRead>(fileName)) {}
Color BrdfShader::shade(Scene const &scene, Ray const &ray) const {
Color illuminationColor;
// IMPLEMENT ME
return illuminationColor;
}

23
shader/brdfshader.h Normal file
View file

@ -0,0 +1,23 @@
#ifndef BRDFSHADER_H
#define BRDFSHADER_H
#include "common/brdfread.h"
#include "shader/shader.h"
#include <memory>
class BrdfShader : public Shader {
public:
// Constructor
BrdfShader(char const *fileName, Color const &scale);
~BrdfShader() override = default;
// Shader functions
Color shade(Scene const &scene, Ray const &ray) const override;
private:
Color scale;
std::unique_ptr<BRDFRead> brdf;
};
#endif

13
shader/cooktorranceshader.cpp Normal file
View file

@ -0,0 +1,13 @@
#include "light/light.h"
#include "scene/scene.h"
#include "shader/cooktorranceshader.h"
CookTorranceShader::CookTorranceShader(Color const &diffCol, Color const &ctCol, float IOR, float roughness, float diffCoeff, float ctCoeff) : diffuseColor(diffCol * diffCoeff), ctColor(ctCol * ctCoeff), F0(IOR), m(roughness) {}
Color CookTorranceShader::shade(Scene const &scene, Ray const &ray) const {
Color fragmentColor;
// IMPLEMENT ME
return fragmentColor;
}

26
shader/cooktorranceshader.h Normal file
View file

@ -0,0 +1,26 @@
#ifndef COOKTORRANCESHADER_H
#define COOKTORRANCESHADER_H
#include "shader/shader.h"
class CookTorranceShader : public Shader {
public:
CookTorranceShader(Color const &diffuseColor, Color const &ctColor, float IOR, float roughness,
float diffuseCoefficient = PI / 2.0f, float ctCoefficient = PI / 2.0f);
// Shader functions
Color shade(Scene const &scene, Ray const &ray) const override;
private:
float D(float NdotH) const;
float F(float VdotH) const;
float G(float NdotH, float NdotV, float VdotH, float NdotL) const;
Color diffuseColor;
Color ctColor;
float F0;
float m;
};
#endif

13
shader/lambertshader.cpp Normal file
View file

@ -0,0 +1,13 @@
#include "light/light.h"
#include "scene/scene.h"
#include "shader/lambertshader.h"
LambertShader::LambertShader(Color const &diffuseColor) : diffuseColor(diffuseColor) {}
Color LambertShader::shade(Scene const &scene, Ray const &ray) const {
Color fragmentColor;
// IMPLEMENT ME
return fragmentColor;
}

19
shader/lambertshader.h Normal file
View file

@ -0,0 +1,19 @@
#ifndef LAMBERTSHADER_H
#define LAMBERTSHADER_H
#include "shader/shader.h"
class LambertShader : public Shader {
public:
// Constructor
LambertShader(Color const &diffuseColor = Color(1, 1, 1));
// Shader functions
Color shade(Scene const &scene, Ray const &ray) const override;
protected:
Color diffuseColor;
};
#endif

16
shader/phongshader.cpp Normal file
View file

@ -0,0 +1,16 @@
#include "light/light.h"
#include "scene/scene.h"
#include "shader/phongshader.h"
PhongShader::PhongShader(Color const &diffuseColor, float diffuseCoefficient, Color const &specularColor,
float specularCoefficient, float shininessExponent)
: diffuseColor(diffuseColor), diffuseCoefficient(diffuseCoefficient), specularColor(specularColor),
specularCoefficient(specularCoefficient), shininessExponent(shininessExponent) {}
Color PhongShader::shade(Scene const &scene, Ray const &ray) const {
Color fragmentColor;
// IMPLEMENT ME
return fragmentColor;
}

25
shader/phongshader.h Normal file
View file

@ -0,0 +1,25 @@
#ifndef PHONGSHADER_H
#define PHONGSHADER_H
#include "shader/shader.h"
class PhongShader : public Shader {
public:
// Constructor
PhongShader(Color const &diffuseColor, float diffuseCoefficient, Color const &specularColor,
float specularCoefficient, float shininessExponent);
// Shader functions
Color shade(Scene const &scene, Ray const &ray) const override;
private:
Color diffuseColor;
float diffuseCoefficient;
Color specularColor;
float specularCoefficient;
float shininessExponent;
};
#endif