Creating Sphere with GL_TRIANGLE_STRIP I would like to create a sphere with variable tesselation (in both horizontal and vertical aspect), this is my algorithm: const int amount = (sectorCount + 1) * (stackCount + 1); M3DVector3f *verts = (M3DVector3f*)malloc(sizeof(float) * 3 * amount); M3DVector4f *colors = (M3DVector4f*)malloc(sizeof(float) * 4 * amount); float sectorStep = 2 * GL_PI / sectorCount; float stackStep = GL_PI / stackCount; float sectorAngle, stackAngle; int vCount = 0; for (int i = 0; i <= stackCount; ++i) { stackAngle = GL_PI / 2 - i * stackStep; // starting from pi/2 to -pi/2 float xy = radius * cosf(stackAngle); // r * cos(u) float z = radius * sinf(stackAngle); // r * sin(u) // add (sectorCount+1) vertices per stack // the first and last vertices have same position and normal, but different tex coords for (int j = 0; j <= sectorCount; ++j) { sectorAngle = j * sectorStep; // starting from 0 to 2pi // vertex position (x, y, z) float x = xy * cosf(sectorAngle); // r * cos(u) * cos(v) float y = xy * sinf(sectorAngle); // r * cos(u) * sin(v) m3dLoadVector3(verts[vCount], x, y, z); m3dLoadVector4(colors[vCount], 0, 1, 0, 1); vCount++; } } This code works fine in terms of correct vertice coordinates. Unfortunately the vertices aren't procuded in "correct order" so that GL_TRIANGLE_STRIP (or any other kind of triangle placement) produces a smooth sphere, it more looks like this (see attached images). Unfortunately I also have no clue about how to change the algorithm to make GL_TRIANGLE_STRIP work. Any ideas? https://ift.tt/eA8V8J

I would like to create a sphere with variable tesselation (in both horizontal and vertical aspect), this is my algorithm: const int amount = (sectorCount + 1) * (stackCount + 1); M3DVector3f *verts = (M3DVector3f*)malloc(sizeof(float) * 3 * amount); M3DVector4f *colors = (M3DVector4f*)malloc(sizeof(float) * 4 * amount); float sectorStep = 2 * GL_PI / sectorCount; float stackStep = GL_PI / stackCount; float sectorAngle, stackAngle; int vCount = 0; for (int i = 0; i <= stackCount; ++i) { stackAngle = GL_PI / 2 - i * stackStep; // starting from pi/2 to -pi/2 float xy = radius * cosf(stackAngle); // r * cos(u) float z = radius * sinf(stackAngle); // r * sin(u) // add (sectorCount+1) vertices per stack // the first and last vertices have same position and normal, but different tex coords for (int j = 0; j <= sectorCount; ++j) { sectorAngle = j * sectorStep; // starting from 0 to 2pi // vertex position (x, y, z) float x = xy * cosf(sectorAngle); // r * cos(u) * cos(v) float y = xy * sinf(sectorAngle); // r * cos(u) * sin(v) m3dLoadVector3(verts[vCount], x, y, z); m3dLoadVector4(colors[vCount], 0, 1, 0, 1); vCount++; } } This code works fine in terms of correct vertice coordinates. Unfortunately the vertices aren't procuded in "correct order" so that GL_TRIANGLE_STRIP (or any other kind of triangle placement) produces a smooth sphere, it more looks like this (see attached images). Unfortunately I also have no clue about how to change the algorithm to make GL_TRIANGLE_STRIP work. Any ideas?

from GameDev.net http://bit.ly/2WxfCNw