Cube mapping in OpenGL

I try to map cube with 6 bitmaps to achieve skybox effect. My problem is fact that one texture is mapping to every face of cube. I've checked in gDEBugger, in cube texture memory I have only one image (as I try to load six images). Code preparing texture: ``` bool Texture::LoadCubicTexture(vector<string> filenameTable) { glGenTextures(1,&texID); glBindTexture(GL_TEXTURE_CUBE_MAP,texID); glTexParameteri(GL_TEXTURE_CUBE_MAP,GL_TEXTURE_MAG_FILTER,GL_LINEAR); glTexParameteri(GL_TEXTURE_CUBE_MAP,GL_TEXTURE_MIN_FILTER,GL_LINEAR); glTexParameteri(GL_TEXTURE_CUBE_MAP,GL_TEXTURE_WRAP_S,GL_CLAMP_TO_EDGE); glTexParameteri(GL_TEXTURE_CUBE_MAP,GL_TEXTURE_WRAP_T,GL_CLAMP_TO_EDGE); glTexParameteri(GL_TEXTURE_CUBE_MAP,GL_TEXTURE_WRAP_R,GL_CLAMP_TO_EDGE); int i = 0; vector<string>::iterator vsit; // There is always six filenames for(vsit=filenameTable.begin();vsit!=filenameTable.end();++vsit) { string filename = *vsit; BMPData* bmpData = LoadTextureBMPData_custom(filename); glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X+i,0,GL_RGB,bmpData->width,bmpData->height,0,GL_BGR,GL_UNSIGNED_BYTE,&(bmpData->data[0])); i++; delete daneObrazu; } glGenerateMipmap(GL_TEXTURE_CUBE_MAP); return true; } ``` VS: ``` #version 330 core in vec3 vVertexPos; in vec3 vertexUV; out vec3 vCoords; uniform mat4 MVP; void main() { vCoords = normalize(vertexUV); gl_Position = MVP * vec4(vVertexPos,1.0); } ``` FS: ``` #version 330 core in vec3 vCoords; uniform samplerCube cube; out vec4 vFragColor; void main() { vFragColor = texture(cube, vCoords); } ``` OBJ File: ``` # Blender v2.62 (sub 0) OBJ File: 'skybox.blend' # www.blender.org mtllib skybox.mtl o Cube v 10.487665 -10.487666 -10.487665 v 10.487665 -10.487666 10.487665 v -10.487667 -10.487666 10.487664 v -10.487662 -10.487666 -10.487670 v 10.487671 10.487666 -10.487660 v 10.487659 10.487666 10.487673 v -10.487670 10.487666 10.487662 v -10.487665 10.487666 -10.487666 vt 0.990480 0.014286 vt 0.993478 0.991259 vt 0.016505 0.994256 vt 0.013507 0.017283 vt 0.988479 0.008111 vt 0.985457 0.993412 vt 0.000157 0.990390 vt 0.003179 0.005089 vt 0.002693 1.001082 vt -0.000347 0.009939 vt 0.990796 0.006898 vt 0.993837 0.998041 vt 0.004581 0.999210 vt 0.001535 0.006444 vt 0.994302 0.003398 vt 0.997347 0.996165 vt 0.004172 -0.000587 vt 0.996320 -0.003630 vt 0.999364 0.988517 vt 0.007216 0.991561 vt 0.000632 0.000140 vt 0.983846 -0.002921 vt 0.986862 0.995017 vt 0.003648 0.998078 vn 0.000000 -1.000000 0.000000 vn 0.000000 1.000000 0.000000 vn 1.000000 0.000000 0.000000 vn -0.000000 -0.000000 1.000000 vn -1.000000 -0.000000 -0.000000 vn 0.000000 0.000000 -1.000000 usemtl Skybox s off f 1/1/1 2/2/1 3/3/1 f 1/1/1 3/3/1 4/4/1 f 5/5/2 8/6/2 7/7/2 f 5/5/2 7/7/2 6/8/2 f 1/9/3 5/10/3 6/11/3 f 1/9/3 6/11/3 2/12/3 f 2/13/4 6/14/4 7/15/4 f 2/13/4 7/15/4 3/16/4 f 3/17/5 7/18/5 8/19/5 f 3/17/5 8/19/5 4/20/5 f 5/21/6 1/22/6 4/23/6 f 5/21/6 4/23/6 8/24/6 ``` My questions: - Are techniques I use in this code looks ok? - How textures are mapping for cube (in GL_TEXTURE_CUBE_MAP texture), when there is only 2 UV? (I mean in general.) - Can I use automatic generation of UV's in this situation (do I have to do many changes to shader)? - Can anybody suggest me where can I search for a problem? (with some probability; buffers, shaders, meshes;only suggestion)? [Edit]: I tried to hardcode vertices and uvs in separate source file and I have the same problem- one texture for all faces of cube. Hardcoded data seems to be correct: ``` #include "TestCube.h" vector<vec3> GetTestCubeVertices() { vector<vec3> vrtx; const float xd = 1.0f; const float yd = 1.0f; const float zd = 1.0f; const float testCubeVertices[] = { -xd, -yd, zd, xd, -yd, zd, -xd, yd, zd, // ABE xd, -yd, zd, -xd, yd, zd, xd, yd, zd, // BEF xd, -yd, zd, xd, -yd, -zd, xd, yd, zd, // BCF xd, -yd, -zd, xd, yd, zd, xd, yd, -zd, // CFG xd, -yd, -zd, -xd, -yd, -zd, xd, yd, -zd, // CDG -xd, -yd, -zd, xd, yd, -zd, -xd, yd, -zd, // DGH -xd, -yd, -zd, -xd, -yd, zd, -xd, yd, -zd, // DAH -xd, -yd, zd, -xd, yd, -zd, -xd, yd, zd, // AHE -xd, yd, zd, xd, yd, zd, -xd, yd, -zd, // EFH xd, yd, zd, -xd, yd, -zd, xd, yd, -zd, // FHG xd, -yd, zd, -xd, -yd, zd, xd, -yd, -zd, // BAC -xd, -yd, zd, xd, -yd, -zd, -xd, -yd, -zd, // ACD }; for(int i=0;i<108;i=i+3) vrtx.push_back(vec3(testCubeVertices[i],testCubeVertices[i+1],testCubeVertices[i+2])); return vrtx; } vector<vec2> GetTestCubeUVs() { vector<vec2> uv; const float testCubeUV[] = { 0,0, 1,0, 0,1, // ABE 1,0, 0,1, 1,1, // BEF 0,0, 1,0, 0,1, // BCF 1,0, 0,1, 1,1, // CFG 0,0, 1,0, 0,1, // CDG 1,0, 0,1, 1,1, // DGH 0,0, 1,0, 0,1, // DAH 1,0, 0,1, 1,1, // AHE 0,0, 1,0, 0,1, // EFH 1,0, 0,1, 1,1, // FHG 0,0, 1,0, 0,1, // BAC 1,0, 0,1, 1,1, // ACD }; for(int i=0;i<72;i=i+2) uv.push_back(vec2(testCubeUV[i],testCubeUV[i+1])); return uv; } ``` Still two suplementary questions, I have OpenGL call: ``` glTexParameteri(GL_TEXTURE_CUBE_MAP,GL_TEXTURE_WRAP_R,GL_CLAMP_TO_EDGE); ``` - I understand that OpenGL handles r coordinate automatically, because have the information in constant GL_TEXTURE_CUBE_MAP_POSITIVE_X for glTexImage2D()? - Is there necessary any modification of r coordinate in Vertex Shader? There's result screen below (disabled writing to depth buffer and didn't set scalling, but it's not my problem now): I've noticed that duplicated texture is fifth loaded texture (GL_TEXTURE_CUBE_MAP_POSITIVE_Z). [LAST EDIT]: There was problem with UV coordinates in Skybox VS (r coordinate has one value), Skybox VS should be, as below: ``` void main() { vCoords = normalize(vVertexPos); gl_Position = MVP * vec4(vVertexPos,1.0); } ``` There's a few issues with Skybox technique, but they wasn't topic of this thread. Solved.