0，引入

这个场景中包含两匹马，不知道怎么起名，所以就叫“Two Horses”啦。还有就是用到各种反射模型、各种光照模型、各种纹理、PLY格式的几何模型。

贴图如下：

1，测试代码

接下来，贴出World::build()的代码，完整代码参考后面的下载链接。

#include "World.h"
#include "Ambient.h"
#include "Pinhole.h"
#include "Directional.h"
#include "PointLight.h"
#include "RayCast.h"
#include "Whitted.h"
#include "Matte.h"
#include "Plane.h"
#include "Phong.h"
#include "MultiJittered.h"
#include "AmbientOccluder.h"
#include "Emissive.h"
#include "AreaLight.h"
#include "Rectangle.h"
#include "AreaLighting.h"
#include "Instance.h"
#include "Disk.h"
#include "Grid.h"
#include "CubicNoise.h"
#include "Image.h"
#include "FBmTextureRamp.h"
#include "InstanceTexture.h"
#include "SV_Matte.h"
#include "SV_Phong.h"
#include "Wood.h"
#include "Checker3D.h"
#include "Dielectric.h"
#include "Annulus.h"
#include "TorusPartConvex.h"
#include "SphericalMap.h"
#include "Image.h"
#include "ImageTexture.h"
#include "OpenCylinder.h"
#include "Reflective.h"
#include "SolidCylinder.h"
#include "SolidCylinderChecker.h"
#include "SV_PlaneChecker.h"
#include "SV_Reflective.h"
#include "SV_GlossyReflector.h"#include <iostream>
#include <fstream>
using namespace std;void
World::build(void){int num_samples = 256;int a = 1;vp.set_hres(600/a); // 600*500vp.set_vres(500/a);vp.set_samples(num_samples);vp.set_max_depth(4);//  tracer_ptr = new RayCast(this);
//  tracer_ptr = new Whitted(this);tracer_ptr = new AreaLighting(this);Pinhole* pinhole_ptr = new Pinhole;pinhole_ptr->set_eye(20, 10, 80);pinhole_ptr->set_lookat(-4, -2, -2);pinhole_ptr->set_view_distance(3600/a); // 3600pinhole_ptr->compute_uvw();set_camera(pinhole_ptr);Ambient* ambient_ptr = new Ambient;ambient_ptr->scale_radiance(5.0);set_ambient_light(ambient_ptr);MultiJittered* sampler_ptr = new MultiJittered(num_samples);AmbientOccluder* occluder_ptr = new AmbientOccluder;occluder_ptr->scale_radiance(1.0);occluder_ptr->set_min_amount(0.0);occluder_ptr->set_sampler(sampler_ptr);
//  set_ambient_light(occluder_ptr);// emissive sphereEmissive* emissive_ptr = new Emissive;emissive_ptr->scale_radiance(8.0);emissive_ptr->set_ce(white);Disk* disk_ptr = new Disk(Point3D(2.0, 10.0, 10.0), 1.5, Normal(0, -1, 0));disk_ptr->set_material(emissive_ptr);disk_ptr->set_sampler(new MultiJittered(num_samples));add_object(disk_ptr);AreaLight* area_light_ptr = new AreaLight;area_light_ptr->set_object(disk_ptr);area_light_ptr->set_cast_shadow(true);add_light(area_light_ptr);PointLight* point_light_ptr1 = new PointLight;point_light_ptr1->set_location(30, 10, 30);point_light_ptr1->scale_radiance(6.0);point_light_ptr1->set_cast_shadow(false);
//  add_light(point_light_ptr1);plane leftPlane* plane_left_ptr = new Plane();// wood textureRGBColor light_color(0.5, 0.2, 0.065);RGBColor dark_color(0.05);Wood* wood_ptr = new Wood(light_color, dark_color);wood_ptr->set_grainy(1.0);wood_ptr->set_ringy(1.0);InstanceTexture* transformed_wood_plane_ptr = new InstanceTexture(wood_ptr);transformed_wood_plane_ptr->scale(0.4);transformed_wood_plane_ptr->rotate_z(110);SV_PlaneChecker* sv_plane_checker_left_ptr = new SV_PlaneChecker;sv_plane_checker_left_ptr->set_size(2.0);sv_plane_checker_left_ptr->set_line_width(0.4);sv_plane_checker_left_ptr->set_color1(new ConstantColor(RGBColor(0.5)));sv_plane_checker_left_ptr->set_color2(new ConstantColor(RGBColor(0.5)));sv_plane_checker_left_ptr->set_line_color(transformed_wood_plane_ptr);// textured material:float exp_left = 1000.0;SV_GlossyReflector* sv_glossy_left_ptr = new SV_GlossyReflector;sv_glossy_left_ptr->set_samples(num_samples, exp_left);sv_glossy_left_ptr->set_ka(0.1);                // 0.4sv_glossy_left_ptr->set_kd(0.25);                // 0.8sv_glossy_left_ptr->set_ks(0.1);                // 0.5sv_glossy_left_ptr->set_exp(exp_left);              // for phongsv_glossy_left_ptr->set_cd(sv_plane_checker_left_ptr);sv_glossy_left_ptr->set_kr(0.75);sv_glossy_left_ptr->set_exponent(exp_left);         // for glossy.sv_glossy_left_ptr->set_cr(new ConstantColor(white));   // greenInstance* instance_plane_left_ptr = new Instance(plane_left_ptr);instance_plane_left_ptr->rotate_z(90);instance_plane_left_ptr->translate(-4, 0, 0);instance_plane_left_ptr->set_material(sv_glossy_left_ptr);add_object(instance_plane_left_ptr);rectangle back 1Rectangle* rectangle_back_ptr1 = new Rectangle(Point3D(-4, -2, 0), Vector3D(20, 0, 0), Vector3D(0, 2, 0), Normal(0, 0, 1));// noise:CubicNoise* noise_back1_ptr = new CubicNoise;noise_back1_ptr->set_num_octaves(6);noise_back1_ptr->set_gain(0.5);noise_back1_ptr->set_lacunarity(2.0);// ramp image:Image* image_back1_ptr = new Image;image_back1_ptr->read_ppm_file(".\\TextureFiles\\ppm\\sandstone_ramp4.ppm");// marble texture:FBmTextureRamp* texture_back1_ptr = new FBmTextureRamp(image_back1_ptr);texture_back1_ptr->set_noise(noise_back1_ptr);texture_back1_ptr->set_perturbation(0.1);InstanceTexture* it_back1_ptr = new InstanceTexture(texture_back1_ptr);it_back1_ptr->scale(0.5);it_back1_ptr->rotate_z(60);it_back1_ptr->translate(1.0, 4.0, 0.0);// textured material:float exp_back1 = 100.0;SV_GlossyReflector* sv_glossy_back1_ptr = new SV_GlossyReflector;sv_glossy_back1_ptr->set_samples(num_samples, exp_back1);sv_glossy_back1_ptr->set_ka(0.1);                // 0.4sv_glossy_back1_ptr->set_kd(0.25);                // 0.8sv_glossy_back1_ptr->set_ks(0.1);                // 0.5sv_glossy_back1_ptr->set_exp(exp_back1);              // for phongsv_glossy_back1_ptr->set_cd(it_back1_ptr);sv_glossy_back1_ptr->set_kr(0.75);sv_glossy_back1_ptr->set_exponent(exp_back1);         // for glossy.sv_glossy_back1_ptr->set_cr(new ConstantColor(white));   // greenInstance* instance_rectangle_back1_ptr = new Instance(rectangle_back_ptr1);instance_rectangle_back1_ptr->translate(0, 0, -4);instance_rectangle_back1_ptr->set_material(sv_glossy_back1_ptr);add_object(instance_rectangle_back1_ptr);rectangle back 2Rectangle* rectangle_back_ptr2 = new Rectangle();// image:Image* image_back_ptr2 = new Image;image_back_ptr2->read_ppm_file(".\\TextureFiles\\ppm\\CloudsLowRes.ppm");// image based texture:ImageTexture* texture_image_ptr = new ImageTexture;texture_image_ptr->set_image(image_back_ptr2);// material:SV_Phong* sv_phong_back_ptr2 = new SV_Phong;sv_phong_back_ptr2->set_ka(0.1);sv_phong_back_ptr2->set_kd(0.5);sv_phong_back_ptr2->set_cd(texture_image_ptr);sv_phong_back_ptr2->set_ks(0.1);sv_phong_back_ptr2->set_exp(20.0);Instance* instance_rectangle_back2_ptr = new Instance(rectangle_back_ptr2);instance_rectangle_back2_ptr->scale(10, 1, 4);instance_rectangle_back2_ptr->rotate_x(90);instance_rectangle_back2_ptr->translate(6, 4, -4);instance_rectangle_back2_ptr->set_material(sv_phong_back_ptr2);add_object(instance_rectangle_back2_ptr);plane downPlane* plane_down_ptr = new Plane();// noise:CubicNoise* noise_down_ptr = new CubicNoise;noise_down_ptr->set_num_octaves(6);noise_down_ptr->set_gain(0.5);noise_down_ptr->set_lacunarity(2.0);// ramp image:Image* image_down_ptr = new Image;image_down_ptr->read_ppm_file(".\\TextureFiles\\ppm\\BlueMarbleRamp.ppm");// marble texture:FBmTextureRamp* texture_down_ptr = new FBmTextureRamp(image_down_ptr);texture_down_ptr->set_noise(noise_down_ptr);texture_down_ptr->set_perturbation(4.0);InstanceTexture* it_down_ptr = new InstanceTexture(texture_down_ptr);
//  it_down_ptr->scale(0.5);it_down_ptr->rotate_z(60);it_down_ptr->translate(1.0, 4.0, 0.0);SV_PlaneChecker* sv_plane_checker_down_ptr = new SV_PlaneChecker;sv_plane_checker_down_ptr->set_size(4.0);sv_plane_checker_down_ptr->set_line_width(0.05);sv_plane_checker_down_ptr->set_color1(it_down_ptr);sv_plane_checker_down_ptr->set_color2(it_down_ptr);sv_plane_checker_down_ptr->set_line_color(new ConstantColor(RGBColor(0.2)));// textured material:float exp_down = 1000.0;SV_GlossyReflector* sv_glossy_down_ptr = new SV_GlossyReflector;sv_glossy_down_ptr->set_samples(num_samples, exp_down);sv_glossy_down_ptr->set_ka(0.1);                // 0.4sv_glossy_down_ptr->set_kd(0.25);                // 0.8sv_glossy_down_ptr->set_ks(0.1);                // 0.5sv_glossy_down_ptr->set_exp(exp_down);              // for phongsv_glossy_down_ptr->set_cd(sv_plane_checker_down_ptr);sv_glossy_down_ptr->set_kr(0.75);sv_glossy_down_ptr->set_exponent(exp_down);         // for glossy.sv_glossy_down_ptr->set_cr(new ConstantColor(white));   // greenInstance* instance_plane_down_ptr = new Instance(plane_down_ptr);instance_plane_down_ptr->translate(0, -2, 0);instance_plane_down_ptr->set_material(sv_glossy_down_ptr);add_object(instance_plane_down_ptr);horsechar* file_horse_name = ".\\PLYFiles\\Horse97K.ply";Grid* grid_horse_ptr = new Grid(new Mesh);grid_horse_ptr->read_smooth_triangles(file_horse_name);grid_horse_ptr->setup_cells();// textured material:float exp_horse1 = 1000000.0;SV_GlossyReflector* sv_glossy_horse_ptr1 = new SV_GlossyReflector;sv_glossy_horse_ptr1->set_samples(num_samples, exp_horse1);sv_glossy_horse_ptr1->set_ka(0.1);                // 0.4sv_glossy_horse_ptr1->set_kd(0.4);                // 0.8sv_glossy_horse_ptr1->set_ks(0.1);                // 0.5sv_glossy_horse_ptr1->set_exp(exp_horse1);              // for phongsv_glossy_horse_ptr1->set_cd(new ConstantColor(RGBColor(1.0, 0.2, 0.2)));sv_glossy_horse_ptr1->set_kr(0.75);sv_glossy_horse_ptr1->set_exponent(exp_horse1);         // for glossy.sv_glossy_horse_ptr1->set_cr(new ConstantColor(white));   // greenInstance* instance_horse_ptr1 = new Instance(grid_horse_ptr);instance_horse_ptr1->scale(9);instance_horse_ptr1->rotate_y(-30);instance_horse_ptr1->translate(-1, 0.5, 14);instance_horse_ptr1->set_material(sv_glossy_horse_ptr1);add_object(instance_horse_ptr1);// textured material:float exp_horse2 = 1000000.0;SV_GlossyReflector* sv_glossy_horse_ptr2 = new SV_GlossyReflector;sv_glossy_horse_ptr2->set_samples(num_samples, exp_horse2);sv_glossy_horse_ptr2->set_ka(0.1);                // 0.4sv_glossy_horse_ptr2->set_kd(0.4);                // 0.8sv_glossy_horse_ptr2->set_ks(0.1);                // 0.5sv_glossy_horse_ptr2->set_exp(exp_horse2);              // for phongsv_glossy_horse_ptr2->set_cd(new ConstantColor(RGBColor(0.5, 1.0, 0.5)));sv_glossy_horse_ptr2->set_kr(0.75);sv_glossy_horse_ptr2->set_exponent(exp_horse2);         // for glossy.sv_glossy_horse_ptr2->set_cr(new ConstantColor(white));   // greenInstance* instance_horse_ptr2 = new Instance(grid_horse_ptr);instance_horse_ptr2->scale(9);instance_horse_ptr2->rotate_y(-30);instance_horse_ptr2->translate(2, 0.5, 8);instance_horse_ptr2->set_material(sv_glossy_horse_ptr2);add_object(instance_horse_ptr2);
}

2，输出图形

3，其他说明

完整代码下载链接：
http://download.csdn.net/detail/libing_zeng/9814873

4，补充图形

前面的图形参数：
单像素点采样次数为256；
back rectangle 1的参数：
instance_rectangle_back2_ptr->scale(10, 1, 4);
instance_rectangle_back2_ptr->rotate_x(90);
instance_rectangle_back2_ptr->translate(6, 4, -4);

补充的图形参数：
单像素点采样次数为16；
back rectangle 1的参数：
instance_rectangle_back2_ptr->scale(4, 1, 4);
instance_rectangle_back2_ptr->rotate_x(90);
instance_rectangle_back2_ptr->translate(0, 4, -4);

输出图形：

（天空的云看起来更为真实；但是，由于采样次数只有16，对于面积光源来说太少了，所以出现“白色”噪声点）

后来想想还是再生成一个“单像素点采样次数为256”的图形。
单像素点采样次数为256；
back rectangle 1的参数：
instance_rectangle_back2_ptr->scale(4, 1, 4);
instance_rectangle_back2_ptr->rotate_x(90);
instance_rectangle_back2_ptr->translate(0, 4, -4);

输出图形：

（这个图形是好几天之后生成的，所以没有包含在之前的代码包中）

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