[距離減衰]の変更点 - OpenGLプログラミングメモ

距離減衰

「距離減衰」(2014/05/01 (木) 18:06:34) の最新版変更点

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距離による光の減衰です。 <img alt="" src="http://www21.atwiki.jp/opengl?cmd=upload&act=open&pageid=183&file=att.png" /> vertex.shader <table width="600" border="1" cellspacing="1" cellpadding="1"><tbody><tr><td> //フラグメントシェーダーに渡す変数 varying vec3 P;//位置ベクトル varying vec3 N;//法線ベクトル void main(void) { P = vec3(gl_ModelViewMatrix * gl_Vertex); N = normalize(gl_NormalMatrix * gl_Normal); gl_Position = ftransform(); }</td> </tr></tbody></table>flagment.shader <table width="600" border="1" cellspacing="1" cellpadding="1"><tbody><tr><td> //頂点シェーダーから受け取る変数 varying vec3 P;//位置ベクトル varying vec3 N;//法線ベクトル void main(void) { vec3 L = gl_LightSource[0].position.xyz - P; float d = length(L);//光源までの距離 //減衰計数 float attenuation = 1.0 / (gl_LightSource[0].constantAttenuation + gl_LightSource[0].linearAttenuation * d + gl_LightSource[0].quadraticAttenuation * d * d ); L = normalize(L); N = normalize(N); vec4 ambient = gl_FrontLightProduct[0].ambient; float dotNL = dot(N, L); vec4 diffuse = gl_FrontLightProduct[0].diffuse * max(0.0, dotNL); vec3 V = normalize(-P); vec3 H = normalize(L + V); float powNH = pow(max(dot(N, H), 0.0), gl_FrontMaterial.shininess); if(dotNL <= 0.0) powNH = 0.0; vec4 specular = gl_FrontLightProduct[0].specular * powNH; //統合 gl_FragColor = ambient + diffuse + specular; //減衰率を乗じる gl_FragColor *= attenuation; } </td> </tr></tbody></table>GLSL.h <table width="600" border="1" cellspacing="1" cellpadding="1"><tbody><tr><td> #pragma once #include <stdio.h> //GLSLクラス class GLSL{ public: GLuint ShaderProg; GLuint VertexShader, FragmentShader; void ReadShaderCompile(GLuint Shader, const char *File);//shader fileを読み込みコンパイルする void Link( GLuint Prog );//リンクする void InitGLSL(const char *VertexFile);//GLSLの初期化 void InitGLSL(const char *VertexFile, const char *FragmentFile);//GLSLの初期化 void ON();//シェーダー描画に切り替え void OFF();//シェーダー解除 ~GLSL(); }; void GLSL::ReadShaderCompile(GLuint Shader, const char *File){ FILE *fp; char *buf; GLsizei size, len; GLint compiled; fopen_s(&fp,File, "rb"); if(!fp) printf("ファイルを開くことができません %s\n", File); fseek(fp, 0, SEEK_END); size = ftell(fp); buf = (GLchar *)malloc(size); if (buf == NULL) { printf("メモリが確保できませんでした \n"); } fseek(fp, 0, SEEK_SET); fread(buf, 1, size, fp); glShaderSource(Shader, 1, (const GLchar **)&buf, &size); free(buf); fclose(fp); glCompileShader(Shader); glGetShaderiv( Shader, GL_COMPILE_STATUS, &compiled ); if ( compiled == GL_FALSE ) { printf( "コンパイルできませんでした!!: %s \n ", File); glGetProgramiv( Shader, GL_INFO_LOG_LENGTH, &size ); if ( size > 0 ) { buf = (char *)malloc(size); glGetShaderInfoLog( Shader, size, &len, buf); printf(buf); free(buf); } } } void GLSL::Link( GLuint Prog ){ GLsizei size, len; GLint linked; char *infoLog ; glLinkProgram( Prog ); glGetProgramiv( Prog, GL_LINK_STATUS, &linked ); if ( linked == GL_FALSE ){ printf("リンクできませんでした!! \n"); glGetProgramiv( Prog, GL_INFO_LOG_LENGTH, &size ); if ( size > 0 ){ infoLog = (char *)malloc(size); glGetProgramInfoLog( Prog, size, &len, infoLog ); printf(infoLog); free(infoLog); } } } void GLSL::InitGLSL(const char *VertexFile){ GLenum err = glewInit(); if (err != GLEW_OK) { printf("Error: %s\n", glewGetErrorString(err)); } printf("VENDOR= %s \n", glGetString(GL_VENDOR)); printf("GPU= %s \n", glGetString(GL_RENDERER)); printf("OpenGL= %s \n", glGetString(GL_VERSION)); printf("GLSL= %s \n", glGetString(GL_SHADING_LANGUAGE_VERSION)); VertexShader = glCreateShader(GL_VERTEX_SHADER); ReadShaderCompile(VertexShader, VertexFile); ShaderProg = glCreateProgram(); glAttachShader(ShaderProg, VertexShader); glDeleteShader(VertexShader); Link(ShaderProg); } void GLSL::InitGLSL(const char *VertexFile, const char *FragmentFile){ GLenum err = glewInit(); if (err != GLEW_OK) { printf("Error: %s\n", glewGetErrorString(err)); } printf("VENDOR= %s \n", glGetString(GL_VENDOR)); printf("GPU= %s \n", glGetString(GL_RENDERER)); printf("OpenGL= %s \n", glGetString(GL_VERSION)); printf("GLSL= %s \n", glGetString(GL_SHADING_LANGUAGE_VERSION)); VertexShader = glCreateShader(GL_VERTEX_SHADER); FragmentShader = glCreateShader(GL_FRAGMENT_SHADER); ReadShaderCompile(VertexShader, VertexFile); ReadShaderCompile(FragmentShader, FragmentFile); ShaderProg = glCreateProgram(); glAttachShader(ShaderProg, VertexShader); glAttachShader(ShaderProg, FragmentShader); glDeleteShader(VertexShader); glDeleteShader(FragmentShader); Link(ShaderProg); } void GLSL::ON(){ glUseProgram(ShaderProg); } void GLSL::OFF(){ glUseProgram(0); } GLSL::~GLSL(){ glDeleteProgram(ShaderProg); } </td> </tr></tbody></table>main.cpp <table width="600" border="1" cellspacing="1" cellpadding="1"><tbody><tr><td> #pragma comment(linker, "/SUBSYSTEM:WINDOWS /ENTRY:mainCRTStartup") #pragma comment(lib, "glew32.lib") #include <GL/glew.h> #include <GL/freeglut/freeglut.h> #include "GLSL.h" #include <math.h> #define PAI 3.141592f #define WIDTH 640 #define HEIGHT 480 GLSL glsl; //回転用 float anglex = 0.0f; //ライトの位置 GLfloat lightpos[] = { 0.0, 4.0, 0.0, 1.0 }; float Ambient[] = {0.2f, 0.1f, 0.2f, 1.0f}; float Diffuse[] = {0.8f, 0.0f, 0.0f, 1.0f}; float Specular[]= { 0.4f, 0.4f, 0.4f, 1.0f};//鏡面反射 float AmbientLight[] = { 1.0f, 1.0f, 1.0f, 1.0f}; float DiffuseLight[] = { 0.7f, 0.7f, 0.7f, 1.0f}; float SpecularLight[] = {1.0f, 1.0f, 1.0f, 1.0f};//鏡面光 float pos[] = {-0.7f, 2.0f, 0.0f};//位置 float constAtt = 1.0; float linearAtt = 0.0; float quadraAtt = 0.0; //影のマテリアル float shadowDiffuse[] = {0.0f,0.0f,0.0f,0.3f};//影の拡散光 float shadowSpecular[] = {0.0f,0.0f,0.0f,1.0f};//影の鏡面光 void draw(bool flag){ if(flag) { glMaterialfv(GL_FRONT,GL_AMBIENT_AND_DIFFUSE,shadowDiffuse); glMaterialfv(GL_FRONT,GL_SPECULAR,shadowSpecular); }else{ glMaterialfv(GL_FRONT,GL_AMBIENT,Ambient); glMaterialfv(GL_FRONT,GL_DIFFUSE,Diffuse); glMaterialfv(GL_FRONT,GL_SPECULAR,Specular); glMaterialf(GL_FRONT,GL_SHININESS,8); } glPushMatrix(); glTranslatef(pos[0], pos[1], pos[2]); glRotatef( anglex, 1.0f, 0.0f, 0.0f);//x軸回転 glutSolidCube(1.0); glPopMatrix(); } void drawFloor(float widthX, float widthZ, int nx, int nz){ int i, j; //Floor１枚当たりの幅 float wX = widthX / (float)nx; float wZ = widthZ / (float)nz; float diffuse[][4] = { { 0.9f, 0.9f, 0.9f, 1.0f}, { 0.1f, 0.1f, 0.1f, 1.0f} }; float ambient[] = { 0.2f, 0.2f, 0.2f, 1.0f}; float specular[]= { 0.5f, 0.5f, 0.5f, 1.0f}; glMaterialfv(GL_FRONT,GL_AMBIENT,ambient); glMaterialfv(GL_FRONT,GL_SPECULAR,specular); glMaterialf(GL_FRONT,GL_SHININESS,10); glNormal3d(0.0, 1.0, 0.0); glPushMatrix(); for (j = 0; j < nz; j++) { float z1 = -widthZ / 2.0f + wZ * j; float z2 = z1 + wZ; for (i = 0; i < nx; i++) { float x1 = -widthX / 2.0f + wX * i; float x2 = x1 + wX; glMaterialfv(GL_FRONT, GL_DIFFUSE, diffuse[(i + j) & 1]); glBegin(GL_QUADS); glVertex3d(x1, 0.0, z1); glVertex3d(x1, 0.0, z2); glVertex3d(x2, 0.0, z2); glVertex3d(x2, 0.0, z1); glEnd(); } } glPopMatrix(); } void CalcShadowMat(float* mat) { float ex, ey, ez;//光源の方向 float s; //object中心から光源までの距離 float x, y, z; x = lightpos[0] - pos[0]; y = lightpos[1] - pos[1]; z = lightpos[2] - pos[2]; //光源の方向ベクトル s = sqrt(x * x + y * y + z * z); ex = x / s; ey = y / s; ez = z / s; //shadow matrix mat[0] = ey; mat[1] = 0.0f; mat[2] = 0.0f; mat[3] = 0.0f; mat[4] = -ex; mat[5] = 0.0f; mat[6] = -ez; mat[7] = 0.0f; mat[8] = 0.0f; mat[9] = 0.0f; mat[10] = ey; mat[11] = 0.0f; mat[12] = 0.0f; mat[13] = 0.001f * ey; mat[14] = 0.0f; mat[15] = ey; } void drawShadow() { float mat[16]; glEnable(GL_BLEND); glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA); glDepthMask(GL_FALSE); CalcShadowMat( mat); glPushMatrix(); glMultMatrixf(mat); draw(true); glPopMatrix(); glDepthMask(GL_TRUE); glDisable(GL_BLEND); } void setLight() { float lightAmbient0[] = {0.5, 0.5, 0.5, 1.0}; //環境光 float lightDiffuse0[] = {1.0, 1.0, 1.0, 1.0}; //拡散光 float lightSpecular0[] = {1.0, 1.0, 1.0, 1.0};//鏡面光 glLightfv(GL_LIGHT0, GL_AMBIENT, lightAmbient0); glLightfv(GL_LIGHT0, GL_DIFFUSE, lightDiffuse0); glLightfv(GL_LIGHT0, GL_SPECULAR, lightSpecular0); glLightfv(GL_LIGHT0, GL_POSITION, lightpos); constAtt = 0.0f; linearAtt = 0.0f; quadraAtt = 1.0f / (lightpos[1] * lightpos[1]); glLightf(GL_LIGHT0, GL_CONSTANT_ATTENUATION, constAtt); glLightf(GL_LIGHT0, GL_LINEAR_ATTENUATION, linearAtt); glLightf(GL_LIGHT0, GL_QUADRATIC_ATTENUATION, quadraAtt); glEnable(GL_LIGHT0); glEnable(GL_LIGHTING); } void drawLight(void) { glDisable(GL_LIGHTING); glColor3f(0.8f, 0.8f, 0.0f); glPushMatrix(); glTranslatef(lightpos[0], lightpos[1], lightpos[2]); glutSolidSphere(0.1f, 10, 10); glPopMatrix(); glEnable(GL_LIGHTING); } void display(void) { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glViewport(0, 0, WIDTH, HEIGHT); glMatrixMode(GL_PROJECTION); glLoadIdentity(); //視野角,アスペクト比(ウィンドウの幅/高さ),描画する範囲(最も近い距離,最も遠い距離) gluPerspective(30.0, (double)WIDTH / (double)HEIGHT, 1.0, 1000.0); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); //視点の設定 gluLookAt(10.0,10.0,-2.0, //カメラの座標 0.0,0.0,0.0, // 注視点の座標 0.0,1.0,0.0); // 画面の上方向を指すベクトル //ライトの設定 setLight(); drawLight(); glsl.ON(); draw(false); drawFloor(10.0, 10.0, 10, 10); drawShadow(); glsl.OFF(); glutSwapBuffers(); } void idle(void) { anglex+=0.02f; glutPostRedisplay(); } void Init(){ glsl.InitGLSL("vertex.shader","flagment.shader"); glClearColor(1.0f, 1.0f, 1.0f, 1.0f); glEnable(GL_DEPTH_TEST); glEnable(GL_LIGHTING); glEnable(GL_LIGHT0); glEnable(GL_NORMALIZE); } int main(int argc, char *argv[]) { glutInitWindowPosition(100, 100); glutInitWindowSize(WIDTH, HEIGHT); glutInit(&argc, argv); glutCreateWindow("距離減衰"); glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE); glutDisplayFunc(display); glutIdleFunc(idle); Init(); glutMainLoop(); return 0; } </td> </tr></tbody></table>

距離による光の減衰です。 <img alt="" src="http://cdn21.atwikiimg.com/opengl?cmd=upload&act=open&pageid=183&file=att.png" /> vertex.shader <table border="1" cellpadding="1" cellspacing="1" width="600"><tbody><tr><td> //フラグメントシェーダーに渡す変数 varying vec3 P;//位置ベクトル varying vec3 N;//法線ベクトル void main(void) { P = vec3(gl_ModelViewMatrix * gl_Vertex); N = normalize(gl_NormalMatrix * gl_Normal); gl_Position = ftransform(); }</td> </tr></tbody></table>flagment.shader <table border="1" cellpadding="1" cellspacing="1" width="600"><tbody><tr><td> //頂点シェーダーから受け取る変数 varying vec3 P;//位置ベクトル varying vec3 N;//法線ベクトル void main(void) { vec3 L = gl_LightSource[0].position.xyz - P; float d = length(L);//光源までの距離 //減衰計数 float attenuation = 1.0 / (gl_LightSource[0].constantAttenuation + gl_LightSource[0].linearAttenuation * d + gl_LightSource[0].quadraticAttenuation * d * d ); L = normalize(L); N = normalize(N); vec4 ambient = gl_FrontLightProduct[0].ambient; float dotNL = dot(N, L); vec4 diffuse = gl_FrontLightProduct[0].diffuse * max(0.0, dotNL); vec3 V = normalize(-P); vec3 H = normalize(L + V); float powNH = pow(max(dot(N, H), 0.0), gl_FrontMaterial.shininess); if(dotNL <= 0.0) powNH = 0.0; vec4 specular = gl_FrontLightProduct[0].specular * powNH; //統合 gl_FragColor = ambient + diffuse + specular; //減衰率を乗じる gl_FragColor *= attenuation; } </td> </tr></tbody></table>GLSL.h <table border="1" cellpadding="1" cellspacing="1" width="600"><tbody><tr><td> #pragma once #include <stdio.h> //GLSLクラス class GLSL{ public: GLuint ShaderProg; GLuint VertexShader, FragmentShader; void ReadShaderCompile(GLuint Shader, const char *File);//shader fileを読み込みコンパイルする void Link( GLuint Prog );//リンクする void InitGLSL(const char *VertexFile);//GLSLの初期化 void InitGLSL(const char *VertexFile, const char *FragmentFile);//GLSLの初期化 void ON();//シェーダー描画に切り替え void OFF();//シェーダー解除 ~GLSL(); }; void GLSL::ReadShaderCompile(GLuint Shader, const char *File){ FILE *fp; char *buf; GLsizei size, len; GLint compiled; fopen_s(&fp,File, "rb"); if(!fp) printf("ファイルを開くことができません %s\n", File); fseek(fp, 0, SEEK_END); size = ftell(fp); buf = (GLchar *)malloc(size); if (buf == NULL) { printf("メモリが確保できませんでした \n"); } fseek(fp, 0, SEEK_SET); fread(buf, 1, size, fp); glShaderSource(Shader, 1, (const GLchar **)&buf, &size); free(buf); fclose(fp); glCompileShader(Shader); glGetShaderiv( Shader, GL_COMPILE_STATUS, &compiled ); if ( compiled == GL_FALSE ) { printf( "コンパイルできませんでした!!: %s \n ", File); glGetProgramiv( Shader, GL_INFO_LOG_LENGTH, &size ); if ( size > 0 ) { buf = (char *)malloc(size); glGetShaderInfoLog( Shader, size, &len, buf); printf(buf); free(buf); } } } void GLSL::Link( GLuint Prog ){ GLsizei size, len; GLint linked; char *infoLog ; glLinkProgram( Prog ); glGetProgramiv( Prog, GL_LINK_STATUS, &linked ); if ( linked == GL_FALSE ){ printf("リンクできませんでした!! \n"); glGetProgramiv( Prog, GL_INFO_LOG_LENGTH, &size ); if ( size > 0 ){ infoLog = (char *)malloc(size); glGetProgramInfoLog( Prog, size, &len, infoLog ); printf(infoLog); free(infoLog); } } } void GLSL::InitGLSL(const char *VertexFile){ GLenum err = glewInit(); if (err != GLEW_OK) { printf("Error: %s\n", glewGetErrorString(err)); } printf("VENDOR= %s \n", glGetString(GL_VENDOR)); printf("GPU= %s \n", glGetString(GL_RENDERER)); printf("OpenGL= %s \n", glGetString(GL_VERSION)); printf("GLSL= %s \n", glGetString(GL_SHADING_LANGUAGE_VERSION)); VertexShader = glCreateShader(GL_VERTEX_SHADER); ReadShaderCompile(VertexShader, VertexFile); ShaderProg = glCreateProgram(); glAttachShader(ShaderProg, VertexShader); glDeleteShader(VertexShader); Link(ShaderProg); } void GLSL::InitGLSL(const char *VertexFile, const char *FragmentFile){ GLenum err = glewInit(); if (err != GLEW_OK) { printf("Error: %s\n", glewGetErrorString(err)); } printf("VENDOR= %s \n", glGetString(GL_VENDOR)); printf("GPU= %s \n", glGetString(GL_RENDERER)); printf("OpenGL= %s \n", glGetString(GL_VERSION)); printf("GLSL= %s \n", glGetString(GL_SHADING_LANGUAGE_VERSION)); VertexShader = glCreateShader(GL_VERTEX_SHADER); FragmentShader = glCreateShader(GL_FRAGMENT_SHADER); ReadShaderCompile(VertexShader, VertexFile); ReadShaderCompile(FragmentShader, FragmentFile); ShaderProg = glCreateProgram(); glAttachShader(ShaderProg, VertexShader); glAttachShader(ShaderProg, FragmentShader); glDeleteShader(VertexShader); glDeleteShader(FragmentShader); Link(ShaderProg); } void GLSL::ON(){ glUseProgram(ShaderProg); } void GLSL::OFF(){ glUseProgram(0); } GLSL::~GLSL(){ glDeleteProgram(ShaderProg); } </td> </tr></tbody></table>main.cpp <table border="1" cellpadding="1" cellspacing="1" width="600"><tbody><tr><td> #pragma comment(linker, "/SUBSYSTEM:WINDOWS /ENTRY:mainCRTStartup") #pragma comment(lib, "glew32.lib") #include <GL/glew.h> #include <GL/freeglut/freeglut.h> #include "GLSL.h" #include <math.h> #define PAI 3.141592f #define WIDTH 640 #define HEIGHT 480 GLSL glsl; //回転用 float anglex = 0.0f; //ライトの位置 GLfloat lightpos[] = { 0.0, 4.0, 0.0, 1.0 }; float Ambient[] = {0.2f, 0.1f, 0.2f, 1.0f}; float Diffuse[] = {0.8f, 0.0f, 0.0f, 1.0f}; float Specular[]= { 0.4f, 0.4f, 0.4f, 1.0f};//鏡面反射 float AmbientLight[] = { 1.0f, 1.0f, 1.0f, 1.0f}; float DiffuseLight[] = { 0.7f, 0.7f, 0.7f, 1.0f}; float SpecularLight[] = {1.0f, 1.0f, 1.0f, 1.0f};//鏡面光 float pos[] = {-0.7f, 2.0f, 0.0f};//位置 float constAtt = 1.0; float linearAtt = 0.0; float quadraAtt = 0.0; //影のマテリアル float shadowDiffuse[] = {0.0f,0.0f,0.0f,0.3f};//影の拡散光 float shadowSpecular[] = {0.0f,0.0f,0.0f,1.0f};//影の鏡面光 void draw(bool flag){ if(flag) { glMaterialfv(GL_FRONT,GL_AMBIENT_AND_DIFFUSE,shadowDiffuse); glMaterialfv(GL_FRONT,GL_SPECULAR,shadowSpecular); }else{ glMaterialfv(GL_FRONT,GL_AMBIENT,Ambient); glMaterialfv(GL_FRONT,GL_DIFFUSE,Diffuse); glMaterialfv(GL_FRONT,GL_SPECULAR,Specular); glMaterialf(GL_FRONT,GL_SHININESS,8); } glPushMatrix(); glTranslatef(pos[0], pos[1], pos[2]); glRotatef( anglex, 1.0f, 0.0f, 0.0f);//x軸回転 glutSolidCube(1.0); glPopMatrix(); } void drawFloor(float widthX, float widthZ, int nx, int nz){ int i, j; //Floor１枚当たりの幅 float wX = widthX / (float)nx; float wZ = widthZ / (float)nz; float diffuse[][4] = { { 0.9f, 0.9f, 0.9f, 1.0f}, { 0.1f, 0.1f, 0.1f, 1.0f} }; float ambient[] = { 0.2f, 0.2f, 0.2f, 1.0f}; float specular[]= { 0.5f, 0.5f, 0.5f, 1.0f}; glMaterialfv(GL_FRONT,GL_AMBIENT,ambient); glMaterialfv(GL_FRONT,GL_SPECULAR,specular); glMaterialf(GL_FRONT,GL_SHININESS,10); glNormal3d(0.0, 1.0, 0.0); glPushMatrix(); for (j = 0; j < nz; j++) { float z1 = -widthZ / 2.0f + wZ * j; float z2 = z1 + wZ; for (i = 0; i < nx; i++) { float x1 = -widthX / 2.0f + wX * i; float x2 = x1 + wX; glMaterialfv(GL_FRONT, GL_DIFFUSE, diffuse[(i + j) & 1]); glBegin(GL_QUADS); glVertex3d(x1, 0.0, z1); glVertex3d(x1, 0.0, z2); glVertex3d(x2, 0.0, z2); glVertex3d(x2, 0.0, z1); glEnd(); } } glPopMatrix(); } void CalcShadowMat(float* mat){ float ex, ey, ez;//光源の方向 float s; //object中心から光源までの距離 float x, y, z; x = lightpos[0] - pos[0]; y = lightpos[1] - pos[1]; z = lightpos[2] - pos[2]; //光源の方向ベクトル s = sqrt(x * x + y * y + z * z); ex = x / s; ey = y / s; ez = z / s; //shadow matrix mat[0] = ey; mat[1] = 0.0f; mat[2] = 0.0f; mat[3] = 0.0f; mat[4] = -ex; mat[5] = 0.0f; mat[6] = -ez; mat[7] = 0.0f; mat[8] = 0.0f; mat[9] = 0.0f; mat[10] = ey; mat[11] = 0.0f; mat[12] = 0.0f; mat[13] = 0.001f * ey; mat[14] = 0.0f; mat[15] = ey; } void drawShadow(){ float mat[16]; glEnable(GL_BLEND); glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA); glDepthMask(GL_FALSE); CalcShadowMat( mat); glPushMatrix(); glMultMatrixf(mat); draw(true); glPopMatrix(); glDepthMask(GL_TRUE); glDisable(GL_BLEND); } void setLight(){ float lightAmbient0[] = {0.5, 0.5, 0.5, 1.0}; //環境光 float lightDiffuse0[] = {1.0, 1.0, 1.0, 1.0}; //拡散光 float lightSpecular0[] = {1.0, 1.0, 1.0, 1.0};//鏡面光 glLightfv(GL_LIGHT0, GL_AMBIENT, lightAmbient0); glLightfv(GL_LIGHT0, GL_DIFFUSE, lightDiffuse0); glLightfv(GL_LIGHT0, GL_SPECULAR, lightSpecular0); glLightfv(GL_LIGHT0, GL_POSITION, lightpos); constAtt = 0.0f; linearAtt = 0.0f; quadraAtt = 1.0f / (lightpos[1] * lightpos[1]); glLightf(GL_LIGHT0, GL_CONSTANT_ATTENUATION, constAtt); glLightf(GL_LIGHT0, GL_LINEAR_ATTENUATION, linearAtt); glLightf(GL_LIGHT0, GL_QUADRATIC_ATTENUATION, quadraAtt); glEnable(GL_LIGHT0); glEnable(GL_LIGHTING); } void drawLight(void){ glDisable(GL_LIGHTING); glColor3f(0.8f, 0.8f, 0.0f); glPushMatrix(); glTranslatef(lightpos[0], lightpos[1], lightpos[2]); glutSolidSphere(0.1f, 10, 10); glPopMatrix(); glEnable(GL_LIGHTING); } void display(void){ glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glViewport(0, 0, WIDTH, HEIGHT); glMatrixMode(GL_PROJECTION); glLoadIdentity(); //視野角,アスペクト比(ウィンドウの幅/高さ),描画する範囲(最も近い距離,最も遠い距離) gluPerspective(30.0, (double)WIDTH / (double)HEIGHT, 1.0, 1000.0); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); //視点の設定 gluLookAt(10.0,10.0,-2.0, //カメラの座標 0.0,0.0,0.0, // 注視点の座標 0.0,1.0,0.0); // 画面の上方向を指すベクトル //ライトの設定 setLight(); drawLight(); glsl.ON(); draw(false); drawFloor(10.0, 10.0, 10, 10); drawShadow(); glsl.OFF(); glutSwapBuffers(); } void idle(void){ anglex+=2.0f; Sleep(1); glutPostRedisplay(); } void Init(){ glsl.InitGLSL("vertex.shader","flagment.shader"); glClearColor(1.0f, 1.0f, 1.0f, 1.0f); glEnable(GL_DEPTH_TEST); glEnable(GL_LIGHTING); glEnable(GL_LIGHT0); glEnable(GL_NORMALIZE); } void main(int argc, char *argv[]){ glutInitWindowPosition(100, 100); glutInitWindowSize(WIDTH, HEIGHT); glutInit(&argc, argv); glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE); glutCreateWindow("距離減衰"); glutDisplayFunc(display); glutIdleFunc(idle); Init(); glutMainLoop(); return; } </td> </tr></tbody></table>

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距離減衰

「距離減衰」(2014/05/01 (木) 18:06:34) の最新版変更点