opengl

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 10 months ago . Improve this question I am making a game engine with C++ and Opengl. I making a small game to test my incomplete engine. But after adding classes like Camera, Renderder, Level, Player, Zombie and Human, My Player class's function parameters getting long about 8 arguments because

问题 Can someone help me in understanding why below code is showing triangle in front of the Quad? For gluLookAt(10, 10, 60, 0, 0, 0, 0, 1, 0) and glOrtho(-30, 30, -30, 30, 0, 90) ? Expected Output: Because the 'z' value of the triangle is less than the quad and observer is at 60 unit in the +ive 'z' axis. Thus, the rectangle should had been visible as a whole and only a few parts of the triangle would had been visible. glBegin(GL_QUADS); glColor3f(1, 1, 1); glVertex3f(10, 10, 15); glVertex3f(20,

问题 Can someone help me in understanding why below code is showing triangle in front of the Quad? For gluLookAt(10, 10, 60, 0, 0, 0, 0, 1, 0) and glOrtho(-30, 30, -30, 30, 0, 90) ? Expected Output: Because the 'z' value of the triangle is less than the quad and observer is at 60 unit in the +ive 'z' axis. Thus, the rectangle should had been visible as a whole and only a few parts of the triangle would had been visible. glBegin(GL_QUADS); glColor3f(1, 1, 1); glVertex3f(10, 10, 15); glVertex3f(20,

问题 I've successfully created a frame buffer object and created a texture containing the depth map of my scene. I know I'm doing this correctly since I apply my texture to a rectangle and it looks just fine : Now I'd like to read the values from the texture I've created in my main program and not inside the shaders. Looking into it I found out about two functions, namely: glGetTexImage() and glReadPixels(). Since I'm quite new to openGL, the documentation about these brings more questions than

问题 I have a project on monogame platform. The purpose of the project is to make the calculation of the viewfactor of geometry put into the platform using the ortographic method. In a basic level, I put a basic cube and camera across from the cube. Here as I look into the cube through the camera, I am required to count the number of pixels of an object seen from a perspective by the ortographic method. I already have a solution but it is very slow. In my solution, I count the number of pixels

问题 I tried to instance many cubes side by side each other. My understanding is that I need to create a MVP matrix for each cube and bind this then somehow change the position. then run this in a for loop for how many cubes you'd want. This is what I've tried: while (!glfwWindowShouldClose(window)) { glClearColor(0.0f / 255.0f, 170.0f / 255.0f, 204.0f / 255.0f, 0.0f); glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glUseProgram(programID); glEnableVertexAttribArray(0); glBindBuffer(GL_ARRAY

问题 I just got a new PC and now have to get my demo program running with SDL2/OpenGL. I used the program to try out various techniques and used gluLookAt (which, obviously, shouldn't be used any more or even never should have been used). Now I'm looking for a way to replace the gluLookAt method by building a transformation matrix doing the same as gluLookAt did. I came across this claiming to be usable replacement for gluLookAt (the answer - not the question). My implementation of it looks like

问题 I used glXCreateContext to create the contexts, but the function is deprecated and always results in an OpenGL Version 3.0, where I would need at least 4. Now, if I have understood it right, GLXContext glXCreateContextAttribsARB(Display* dpy, GLXFBConfig config, GLXContext share_context, Bool direct, const int* attrib_list); replaced glXCreateContext . The "new" function allows for explicitly specifying the major version, minor version, profile et cetera in it's attrib_list like this for

问题 I am making a game (RPG) in PyOpenGL which I have a crosshair. I want to check if a 3d object is in the crosshair (or detect if it is at a point), which is a 2d overlay. How can I do that? I tried to use screen.get_at() function, but it displays an error "Cannot call on OpenGL surfaces". Also, it is not good because it only detects a colour, not an object (although you can use the colour to determine an object, but what if there are several objects that have the same colour?). This is what I

问题 I am making a game (RPG) in PyOpenGL which I have a crosshair. I want to check if a 3d object is in the crosshair (or detect if it is at a point), which is a 2d overlay. How can I do that? I tried to use screen.get_at() function, but it displays an error "Cannot call on OpenGL surfaces". Also, it is not good because it only detects a colour, not an object (although you can use the colour to determine an object, but what if there are several objects that have the same colour?). This is what I