c++ - Camera is upside down OpenGL -

i'm having issue camera being upside down in opengl. if render objects without setting camera z rotation 180 degrees, objects rendered upside down. maybe has glm?

here's how i'm setting matrices:

//model matrix: mat4 modelmatrix; modelmatrix = translate(modelmatrix, vec3(entity.getposition().x, entity.getposition().y, entity.getposition().z)); modelmatrix = rotate(modelmatrix, (float) (entity.getrotation().x / 180 * pi), vec3(1, 0, 0)); modelmatrix = rotate(modelmatrix, (float) (entity.getrotation().y / 180 * pi), vec3(0, 1, 0)); modelmatrix = rotate(modelmatrix, (float) (entity.getrotation().z / 180 * pi), vec3(0, 0, 1)); modelmatrix = scale(modelmatrix, entity.getscale()); return modelmatrix;  //view matrix: mat4 viewmatrix; viewmatrix = rotate(viewmatrix, (float)(camera.getrotation().x / 180 * pi), vec3(1, 0, 0)); viewmatrix = rotate(viewmatrix, (float)(camera.getrotation().y / 180 * pi), vec3(0, 1, 0)); viewmatrix = rotate(viewmatrix, (float)(camera.getrotation().z / 180 * pi), vec3(0, 0, 1)); viewmatrix = translate(viewmatrix, camera.getposition() * vec3(-1, -1, -1)); return viewmatrix;  //projection matrix: return glm::perspective(camera.getfieldofview(), display::getwindowaspectratio(), camera.getnearplane(), camera.getfarplane()); 

and here's draw method:

for (int = 0; < entitymap.size(); i++) {     map<gluint, vector<entity>>::iterator iterator(entitymap.begin());     advance(iterator, i);      vector<entity> entitybatch = iterator->second;      model entitymodel = entitybatch[0].getmodel();      mat4 *modelmatrices = new mat4[entitybatch.size()];      (int j = 0; j < entitybatch.size(); j++)     {         modelmatrices[j] = maths::createmodelmatrix(entitybatch[j]);     }      glbindvertexarray(iterator->first);      glenablevertexattribarray(0);     glenablevertexattribarray(1);     glenablevertexattribarray(2);     glenablevertexattribarray(3);     glenablevertexattribarray(4);     glenablevertexattribarray(5);      gluint vertexbufferobjectid;     glgenbuffers(1, &vertexbufferobjectid);     glbindbuffer(gl_array_buffer, vertexbufferobjectid);      glbufferdata(gl_array_buffer, sizeof(mat4) * entitybatch.size(), modelmatrices, gl_static_draw);     glvertexattribpointer(2, 4, gl_float, gl_false, 4 * sizeof(vec4), (glvoid*)(0 * sizeof(vec4)));     glvertexattribpointer(3, 4, gl_float, gl_false, 4 * sizeof(vec4), (glvoid*)(1 * sizeof(vec4)));     glvertexattribpointer(4, 4, gl_float, gl_false, 4 * sizeof(vec4), (glvoid*)(2 * sizeof(vec4)));     glvertexattribpointer(5, 4, gl_float, gl_false, 4 * sizeof(vec4), (glvoid*)(3 * sizeof(vec4)));      glvertexattribdivisor(2, 1);     glvertexattribdivisor(3, 1);     glvertexattribdivisor(4, 1);     glvertexattribdivisor(5, 1);      #if enable_indexing     gldrawelementsinstanced(gl_triangles, entitymodel.getindexcount(), gl_unsigned_int, 0, entitybatch.size());     #else     gldrawarraysinstanced(gl_triangles, 0, entitymodel.getvertexcount(), entitybatch.size());     #endif      gldisablevertexattribarray(0);     gldisablevertexattribarray(1);     gldisablevertexattribarray(2);     gldisablevertexattribarray(3);     gldisablevertexattribarray(4);     gldisablevertexattribarray(5);      glbindbuffer(gl_array_buffer, 0);     gldeletebuffers(1, &vertexbufferobjectid);      glbindvertexarray(0); } 

thank help!

the problem projection matrix.

i forgot glm works in radians , didn't convert field of view degrees radians. works fine now.

i have 1 more question. need give glm::perspect

thanks help!