复制并粘贴我最初写在使用Visual C ++在Opengl中创建3D球体
class SolidSphere {保护 std :: vector< GLfloat>顶点; std :: vector< GLfloat>法线; std :: vector< GLfloat> texcoords; std :: vector< GLushort>指数; $ b $ public： void SolidSphere（float radius，unsigned int rings，unsigned int sector） { float const R = 1./(float)(rings- 1）; float const S = 1./(float)(sectors-1）; int r，s; sphere_vertices.resize（rings * sectors * 3）; sphere_normals.resize（rings * sectors * 3）; sphere_texcoords.resize（rings * sectors * 2）; std :: vector< GLfloat> :: iterator v = sphere_vertices.begin（）; std :: vector< GLfloat> :: iterator n = sphere_normals.begin（）; std :: vector< GLfloat> :: iterator t = sphere_texcoords.begin（）; （s = 0; s <扇区; s ++）{ float const y = sin（-M_PI_2 + M_PI * r * R）的情况下，对于（r = 0; r < ; float const x = cos（2 * M_PI * s * S）* sin（M_PI * r * R）; float const z = sin（2 * M_PI * s * S）* sin（M_PI * r * R）; * t ++ = s * S; * t ++ = r * R; * v ++ = x * radius; * v ++ = y * radius; * v ++ = z * radius; * n ++ = x; * n ++ = y; * n ++ = z; } sphere_indices.resize（rings * sectors * 4）; std：vector< GLushort> :: iterator i = sphere_indices.begin（）;对于（s = 0; s <扇区; s ++）{ * i ++ = r *扇区+ s;对于（r = 0; r我该如何制作他们弯曲
你不能。所有OpenGL原语都是仿射的，即平面或直线。通过绘制具有足够分辨率的短直线部分来模拟曲率。
I want to calculate all the vertices needed and connect them with lines, so I eventually come up with a sphere. How many ways are there to do it? And also the lines between the vertices, will be straight; how can I make them "curved" I know that I can use glutWireSphere(), but I am interested in actually calculating the vertices. A way that I thought about it, was to put all the vertices manually in an array, but I guess that is not the way it's done.
解决方案Copy and Pasting some code I originally wrote in Creating a 3D sphere in Opengl using Visual C++
class SolidSphere { protected std::vector<GLfloat> vertices; std::vector<GLfloat> normals; std::vector<GLfloat> texcoords; std::vector<GLushort> indices; public: void SolidSphere(float radius, unsigned int rings, unsigned int sectors) { float const R = 1./(float)(rings-1); float const S = 1./(float)(sectors-1); int r, s; sphere_vertices.resize(rings * sectors * 3); sphere_normals.resize(rings * sectors * 3); sphere_texcoords.resize(rings * sectors * 2); std::vector<GLfloat>::iterator v = sphere_vertices.begin(); std::vector<GLfloat>::iterator n = sphere_normals.begin(); std::vector<GLfloat>::iterator t = sphere_texcoords.begin(); for(r = 0; r < rings; r++) for(s = 0; s < sectors; s++) { float const y = sin( -M_PI_2 + M_PI * r * R ); float const x = cos(2*M_PI * s * S) * sin( M_PI * r * R ); float const z = sin(2*M_PI * s * S) * sin( M_PI * r * R ); *t++ = s*S; *t++ = r*R; *v++ = x * radius; *v++ = y * radius; *v++ = z * radius; *n++ = x; *n++ = y; *n++ = z; } sphere_indices.resize(rings * sectors * 4); std:vector<GLushort>::iterator i = sphere_indices.begin(); for(r = 0; r < rings; r++) for(s = 0; s < sectors; s++) { *i++ = r * sectors + s; *i++ = r * sectors + (s+1); *i++ = (r+1) * sectors + (s+1); *i++ = (r+1) * sectors + s; } } void draw(GLfloat x, GLfloat y, GLfloat z) { glMatrixMode(GL_MODELVIEW); glPushMatrix(); glTranslatef(x,y,z); glEnableClientState(GL_VERTEX_ARRAY); glEnableClientState(GL_NORMAL_ARRAY); glEnableClientState(GL_TEXTURE_COORD_ARRAY); glVertexPointer(3, GL_FLOAT, 0, &sphere_vertices[0]); glNormalPointer(GL_FLOAT, 0, &sphere_normals[0]); glTexCoordPointer(2, GL_FLOAT, 0, &sphere_texcoords[0]); glDrawElements(GL_QUADS, sphere_indices.size()/4, GL_UNSIGNED_SHORT, sphere_indices); glPopMatrix(); } }
how can I make them "curved"
You can't. All OpenGL primitives are "affine", i.e. planar or straight. Curvature is emulated by drawing short, straight sections with sufficient resolution.
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