我有這個立方體,我想用不同的圖像來覆蓋它的每一面,其中出現一個字母。用不同的圖像覆蓋立方體的每一面 - OpenGL
我的問題是立方體由相同的圖像覆蓋,你可以在下面的圖片看。 但我希望字母A出現在頂部,B在左側,C在右側。
以轉化/變換圖像(字母A,B,C)中的紋理我使用此代碼:
glGenTextures(1, textureA);
glGenTextures(1, textureB);
glGenTextures(1, textureC);
glClearColor (0.0, 0.0, 0.0, 0.0);
if (flagA ==1){
cvtColor(imageA, imageA, CV_BGR2RGB);
glHint(GL_PERSPECTIVE_CORRECTION_HINT,GL_NICEST);
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
glBindTexture(GL_TEXTURE_2D, textureA);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);
//glTexImage2D(GL_TEXTURE_2D, 0, 4,image.cols, image.rows, 0, GL_RGB,GL_UNSIGNED_BYTE, image.data);
gluBuild2DMipmaps(GL_TEXTURE_2D, GL_RGB, imageA.cols, imageA.rows, GL_RGB, GL_UNSIGNED_BYTE, imageA.data);
}
if (flagC ==1){
cvtColor(imageC, imageC, CV_BGR2RGB);
glHint(GL_PERSPECTIVE_CORRECTION_HINT,GL_NICEST);
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
glBindTexture(GL_TEXTURE_2D, textureC);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);
//glTexImage2D(GL_TEXTURE_2D, 0, 4,image.cols, image.rows, 0, GL_RGB,GL_UNSIGNED_BYTE, image.data);
gluBuild2DMipmaps(GL_TEXTURE_2D, GL_RGB, imageC.cols, imageC.rows, GL_RGB, GL_UNSIGNED_BYTE, imageC.data);
}
if (flagB ==1){
cvtColor(imageB, imageB, CV_BGR2RGB);
glHint(GL_PERSPECTIVE_CORRECTION_HINT,GL_NICEST);
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
glBindTexture(GL_TEXTURE_2D, textureB);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);
//glTexImage2D(GL_TEXTURE_2D, 0, 4,image.cols, image.rows, 0, GL_RGB,GL_UNSIGNED_BYTE, image.data);
gluBuild2DMipmaps(GL_TEXTURE_2D, GL_RGB, imageB.cols, imageB.rows, GL_RGB, GL_UNSIGNED_BYTE, imageB.data);
}
我指出,如果切換方框if(flagB==1){...}
與if(flagC==1){...}
(在這種方式與C字母圖像是最後的圖像紋理轉換過程中),我的立方體只有C字母覆蓋。
爲什麼這種奇怪的行爲?
爲了顯示結果,我用這個代碼:
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glEnable(GL_TEXTURE_2D);
glMatrixMode (GL_PROJECTION);
glLoadIdentity();
gluOrtho2D(0, WIDTH, HEIGHT, 0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
if(flagA==1){
glBindTexture(GL_TEXTURE_2D, textureA);
glBegin(GL_QUADS);
glTexCoord2f(0.0f, 0.0f); glVertex2f((GLfloat)((A[3].x)),(GLfloat)(A[3].y));
glTexCoord2f(1.0f, 0.0f); glVertex2f((GLfloat)((A[0].x)),(GLfloat)(A[0].y));
glTexCoord2f(1.0f, 1.0f); glVertex2f((GLfloat)((A[1].x)),(GLfloat)(A[1].y));
glTexCoord2f(0.0f, 1.0f); glVertex2f((GLfloat)((A[2].x)),(GLfloat)(A[2].y));
glEnd();
}
if(flagB==1){
glBindTexture(GL_TEXTURE_2D, textureB);
glBegin(GL_QUADS);
glTexCoord2f(0.0f, 0.0f); glVertex2f((GLfloat)((B[3].x)),(GLfloat)(B[3].y));
glTexCoord2f(1.0f, 0.0f); glVertex2f((GLfloat)((B[0].x)),(GLfloat)(B[0].y));
glTexCoord2f(1.0f, 1.0f); glVertex2f((GLfloat)((B[1].x)),(GLfloat)(B[1].y));
glTexCoord2f(0.0f, 1.0f); glVertex2f((GLfloat)((B[2].x)),(GLfloat)(B[2].y));
glEnd();
}
if(flagC==1){
glBindTexture(GL_TEXTURE_2D, textureC);
glBegin(GL_QUADS);
glTexCoord2f(0.0f, 0.0f); glVertex2f((GLfloat)((C[3].x)),(GLfloat)(C[3].y));
glTexCoord2f(1.0f, 0.0f); glVertex2f((GLfloat)((C[0].x)),(GLfloat)(C[0].y));
glTexCoord2f(1.0f, 1.0f); glVertex2f((GLfloat)((C[1].x)),(GLfloat)(C[1].y));
glTexCoord2f(0.0f, 1.0f); glVertex2f((GLfloat)((C[2].x)),(GLfloat)(C[2].y));
glEnd();
}
我的windows7上的x64和OpenGL工作。
我更新了我的答案。 – Cristina1986 2013-05-05 16:42:04