for (int i; i < 6; i++) should be for (int i=0; i < 6; i++) You declared variable ‘i’ but forgot to initialise the variable, so it could have any arbitrary value, not necessarily ‘0’ 1 solved C++ error C4700: uninitialized local variable ‘i’ used
QT is a cross platform framework and takes care of hiding away things like WinMain and WindowProcs and instead provides a platform neutral abstraction. Fortunately OpenGL is directly supported by QT – and they even have a page showing how to integrate OpenGL with QT here: QT GUI OpenGL Window solved Using winapi and opengl … Read more
You can check out this tutorial: http://www.codeproject.com/Articles/20286/GLUI-Window-Template#_articleTop or You can look at mine I did for a school project. https://github.com/sitting-duck/stuff/tree/master/School%20-%20Comp%20Sci/Computer%20Animation%20-%20Fall%202014/Assn1%20-%20Transformations/assn1%20redo/assn1 In this version I just use key bindings to initiate the transformations. Will be easier than making a GUI, so I did that first to learn how to get the transformation code all working, when … Read more
Many GLSL implementations don’t actually compile the shaders until you call LinkProgram. When you call CompileShader it just does a basic syntax sanity check. That’s because to get reasonable performance on most GPUs, whole program optimization is needed. Thus, you might see what one would normally consider “compile” errors only when you link. solved GLSL … Read more
Actually there are many solutions if you search in Google. Here is one simple solution as below. First define one model containing face and vertex info: class obj3dmodel { struct vertex{ double x; double y; double z; }; struct face{ unsigned int v1,v2,v3; }; std::vector<vertex> vetexes; std::vector<face> faces; public: void readfile(const char* filename); void draw(); … Read more
You have two lines there. What you want to do is to pick the closer line for each pixel, and calculate the distance to it. This will be your intensity at a given point. Furthermore do a fade to black as you approach the bottom of the image (use your pixel’s y position to do … Read more
if you write in header file static PFNGLGETERRORPROC glGetError; every c/cpp have own private copy of glGetError and it not conflict with other because it static – so different cpp files use different versions of glGetError – in one cpp unit you init one version and it !=0, when you enter to another cpp unit … Read more
No, implementing something like OpenGL is not possible. Since the time OpenGL has decended from the heavens complete, writing something like it was forbidden by all common religions. But really, what you’ll actually need is about 21 years of work, a few thousands of developers and broad support from all industry leaders, so yea, piece … Read more
You should call glutSwapBuffers only once in the drawing function. For an animation you have to call glutPostRedisplay, to ensure that the display function will be called again. The glBegin and glEnd calls only have to be called once per circle. In the for loop you just supply vertices with calls to glVertex. To simplify … Read more
As for loading the functions, take a look at this page. And also, don’t forget about context creation. As for setting it up in Visual Studio, you would probably just need to link OpenGL lib files (opengl32.dll for windows, .so for linux, etc..) This snippet might be useful (taken from the first link): void *GetAnyGLFuncAddress(const … Read more
Because it’s possible to set a vertex attribute to a value that’s constant for all elements using glVertexAttrib. Yes, you could to that to the same effect with a uniform as well, but this kind of per-attribute selection of where a value comes from (sourced from array, or set constant) has been around for ages … Read more
If you haven’t enabled vsync, frames swap as often as possible (if you haven’t added artificial pause). If you pushed high load on graphics card, it is likely that your program is GPU-limited (CPU have nothing to do and standing idle waiting for GPU to finish drawing). When your program is invisible, drawing costs close … Read more
Yes OpenGL uses 4×4 uniform transform matrices internally. But the glRotate API uses 4 parameters instead of 3: glMatrixMode(GL_MODELVIEW); glRotatef(angle,x,y,z); it will rotate selected matrix around point (0,0,0) and axis [(0,0,0),(x,y,z)] by angle angle [deg]. If you need to rotate around specific point (x0,y0,z0) then you should also translate: glMatrixMode(GL_MODELVIEW); glTranslatef(+x0,+y0,+z0); glRotatef(angle,x,y,z); glTranslatef(-x0,-y0,-z0); This is … Read more
Locked. There are disputes about this answer’s content being resolved at this time. It is not currently accepting new interactions. According to the Transformations example code in Autodesk’s official SDK, a node’s global position in the world space is recursively calculated by the CalculateGlobalTransform(FbxNode* pNode) function as in the sample code below. Very important things … Read more
Saw your question on my youtube video. It looks to me like some of your triangles are being culled out on the extended bar. Maybe some of the triangles on the bar have incorrect winding? Something to check for. Check the winding on the triangles and play around with the opengl cull face. as for … Read more